Submission #1123910

#	Time	Username	Problem	Language	Result	Execution time	Memory
1123910		Art	Aesthetic (NOI20_aesthetic)	C++17	13 / 100	3 ms	3144 KiB

Aesthetic

// Art - Bui Hai Dang
// Keep typing, keep loving

// #pragma GCC optimize("02,unroll-loops")
#include <bits/stdc++.h>

#define el              cout << '\n'

#define FOR(i, a, b)    for (int i = (a), _b = (b); i <= _b; ++i)
#define REV(i, b, a)    for (int i = (b), _a = (a); i >= _a; --i)
#define REP(i, n)       for (int i = 0, _n = (n); i < _n; ++i)

#define __Art__         int main()

const int N = 1e5 + 10;

using namespace std;

int binpow(int a, int b) {
    int res = 1;
    while (b) {
        if (b & 1) res = 1ll * res * a;
        a = 1ll * a * a; b >>= 1;
    }
    return res;
}

struct convex_hull_trick {
    struct line {
        long long a;
        long long b;

        long long calc(long long x) {
            return a * x + b;
        }
    };

    double slope(line x, line y) {
        return (double)(y.b - x.b) / (double)(x.a - y.a);
    }

    bool bad(line l1, line l2, line l3) { // cmp (l1, l3) vs (l1, l2)
        return (l3.b - l1.b) * (l1.a - l2.a) <= (l2.b - l1.b) * (l1.a - l3.a); // tránh sai số do chia (nếu số quá lớn thì không dùng)
        // return slope(l1, l3) <= slope(l1, l2); // get minimum
    }

// dùng khi xác định được thứ tự add, get tuân theo tăng / giảm liên tiếp
    deque<line> dq;

    void add(line new_line) {
        while (dq.size() >= 2 && bad(dq.end()[-2], dq.end()[-1], new_line)) {
            dq.pop_back();
        }
        dq.push_back(new_line);
    }

    long long get(long long x) {
        while (dq.size() >= 2 && dq[0].calc(x) >= dq[1].calc(x)) { // get minimum, if (<=): get maximum
            dq.pop_front();
        }
        return dq[0].calc(x);
    }

//     struct operation {
//         int pos, top;
//         line overwrite;
//     }; // phục vụ thao tác xóa một đường thẳng, trả cấu trúc dữ liệu về trạng thái ban đầu.
//     vector<operation> undoLst;

// // không theo thứ tự
//     line dq[N];
//     int top = 0;

//     void add(line new_line) {
//         int l = 1, r = top - 1, k = top;

//         while (l <= r) {
//             int m = l + (r - l) / 2;
//             if (bad(dq[m - 1], dq[m], new_line)) {
//                 k = m; r = m - 1;
//             }
//             else {
//                 l = m + 1;
//             }
//         }
//         // undoLst.push_back({k, top, dq[k]}); for rollback
//         top = k + 1;
//         dq[k] = new_line;
//     }

//     long long get(long long x) {
//         int l = 0, r = top - 1;
//         long long res = dq[0].calc(x);
//         while (l < r) {
//             int m = l + (r - l) / 2;
//             long long a = dq[m].calc(x);
//             long long b = dq[m + 1].calc(x);
//             if (a > b) {
//                 l = m + 1;
//             }
//             else {
//                 r = m;
//             }
//             res = min({res, a, b});
//         }
//         return res;
//     }

//     void rollback() { // nếu thêm đường thẳng mới, sau khi xét xong thì xóa và trả lại về danh sách góc
//         operation back = undoLst.back();
//         undoLst.pop_back();

//         top = back.top;
//         dq[back.pos] = back.overwrite;
//     }

} chts;

// sort (a, b) của yi = ai * x + bi
// bool cmp_slope_D(const line &a, const line &b) {
//     if (a.a == b.a) {
//         return a.b < b.b;
//     }
//     return a.a > b.a;
// }

bool _Line_Comp_State;
struct Line { // 
    mutable long long k, m, p;
    bool operator < (const Line &o) const { 
        return _Line_Comp_State ? p < o.p : k < o.k; 
    }
};

struct LineContainer : multiset<Line> { // (for doubles, use inf = 1/.0, div(a,b) = a/b)
    long long div (long long a, long long b) { 
        return a / b - ((a ^ b) < 0 && a % b); 
    }

    bool isect(iterator x, iterator y) {
        if (y == end()) {
            x->p = LLONG_MAX;
            return false;
        }
        if (x->k == y->k) {
            x->p = x->m > y->m ? LLONG_MAX : -LLONG_MAX;
        } 
        else {
            x->p = div(y->m - x->m, x->k - y->k);
        }
        return x->p >= y->p;
    }

    void add(long long k, long long m) {
        auto z = insert({k, m, 0}), y = z++, x = y;
        while (isect(y, z)) { 
            z = erase(z); 
        }
        if (x != begin() && isect(--x, y)) { 
            isect(x, y = erase(y));
        }
        while ((y = x) != begin() && (--x)->p >= y->p) { 
            isect(x, erase(y)); 
        }
    }

    long long get(long long x) {
        assert(!empty());
        _Line_Comp_State = 1;
        auto l = *lower_bound({0, 0, x});
        _Line_Comp_State = 0;
        return l.k * x + l.m;
    }
} cht;

template<class T> inline void Write(T x) {
    if (x < 0) {
        putchar('-');
        x *= -1;
    }
    if (x > 9) Write(x / 10);
    putchar(x % 10 + '0');
}
 
template<class T> inline void Read(T &x) {
    char c;
    for (c = getchar(); (c > '9' | c < '0') && c != '-'; c = getchar());
    T y;
    if (c == '-') x = 0, y = -1;
    else x = c - '0', y = 1;
    for(c = getchar(); c >= '0' && c <= '9'; c = getchar()) x = x * 10 + c - '0';
    x *= y;
}

struct IOPre {
    static constexpr int TEN = 10, SZ = TEN * TEN * TEN * TEN;
    std::array<char, 4 * SZ> num;
    constexpr IOPre() : num{} {
        for (int i = 0; i < SZ; i++) {
            int n = i;
            for (int j = 3; j >= 0; j--) {
                num[i * 4 + j] = static_cast<char>(n % TEN + '0');
                n /= TEN;
            }
        }
    }
};
struct IO {
#if !HAVE_DECL_FREAD_UNLOCKED
    #define fread_unlocked fread
#endif
#if !HAVE_DECL_FWRITE_UNLOCKED
    #define fwrite_unlocked fwrite
#endif
    static constexpr int SZ = 1 << 17, LEN = 32, TEN = 10, HUNDRED = TEN * TEN,
                         THOUSAND = HUNDRED * TEN, TENTHOUSAND = THOUSAND * TEN,
                         MAGIC_MULTIPLY = 205, MAGIC_SHIFT = 11, MASK = 15,
                         TWELVE = 12, SIXTEEN = 16;
    static constexpr IOPre io_pre = {};
    std::array<char, SZ> input_buffer, output_buffer;
    int input_ptr_left, input_ptr_right, output_ptr_right;

    IO()
        : input_buffer{},
          output_buffer{},
          input_ptr_left{},
          input_ptr_right{},
          output_ptr_right{} {}
    IO(const IO&) = delete;
    IO(IO&&) = delete;
    IO& operator=(const IO&) = delete;
    IO& operator=(IO&&) = delete;

    ~IO() { flush(); }

    template <class T>
    struct is_char {
        static constexpr bool value = std::is_same_v<T, char>;
    };

    template <class T>
    struct is_bool {
        static constexpr bool value = std::is_same_v<T, bool>;
    };

    template <class T>
    struct is_string {
        static constexpr bool value =
            std::is_same_v<T, std::string> || std::is_same_v<T, const char*> ||
            std::is_same_v<T, char*> || std::is_same_v<std::decay_t<T>, char*>;
    };

    template <class T, class D = void>
    struct is_custom {
        static constexpr bool value = false;
    };

    template <class T>
    struct is_custom<T, std::void_t<typename T::internal_value_type>> {
        static constexpr bool value = true;
    };

    template <class T>
    struct is_default {
        static constexpr bool value = is_char<T>::value || is_bool<T>::value ||
                                      is_string<T>::value ||
                                      std::is_integral_v<T>;
    };

    template <class T, class D = void>
    struct is_iterable {
        static constexpr bool value = false;
    };

    template <class T>
    struct is_iterable<
        T, typename std::void_t<decltype(std::begin(std::declval<T>()))>> {
        static constexpr bool value = true;
    };

    template <class T, class D = void, class E = void>
    struct is_applyable {
        static constexpr bool value = false;
    };

    template <class T>
    struct is_applyable<T, std::void_t<typename std::tuple_size<T>::type>,
                        std::void_t<decltype(std::get<0>(std::declval<T>()))>> {
        static constexpr bool value = true;
    };

    template <class T>
    static constexpr bool needs_newline = (is_iterable<T>::value ||
                                           is_applyable<T>::value) &&
                                          (!is_default<T>::value);

    template <typename T, typename U>
    struct any_needs_newline {
        static constexpr bool value = false;
    };
    template <typename T>
    struct any_needs_newline<T, std::index_sequence<>> {
        static constexpr bool value = false;
    };
    template <typename T, std::size_t I, std::size_t... Is>
    struct any_needs_newline<T, std::index_sequence<I, Is...>> {
        static constexpr bool value =
            needs_newline<decltype(std::get<I>(std::declval<T>()))> ||
            any_needs_newline<T, std::index_sequence<Is...>>::value;
    };

    inline void load() {
        memmove(std::begin(input_buffer),
                std::begin(input_buffer) + input_ptr_left,
                input_ptr_right - input_ptr_left);
        input_ptr_right =
            input_ptr_right - input_ptr_left +
            static_cast<int>(fread_unlocked(
                std::begin(input_buffer) + input_ptr_right - input_ptr_left, 1,
                SZ - input_ptr_right + input_ptr_left, stdin));
        input_ptr_left = 0;
    }

    inline void read_char(char& c) {
        if (input_ptr_left + LEN > input_ptr_right) load();
        c = input_buffer[input_ptr_left++];
    }
    inline void read_string(std::string& x) {
        char c;
        while (read_char(c), c < '!') continue;
        x = c;
        while (read_char(c), c >= '!') x += c;
    }
    template <class T>
    inline std::enable_if_t<std::is_integral_v<T>, void> read_int(T& x) {
        if (input_ptr_left + LEN > input_ptr_right) load();
        char c = 0;
        do c = input_buffer[input_ptr_left++];
        while (c < '-');
        [[maybe_unused]] bool minus = false;
        if constexpr (std::is_signed<T>::value == true)
            if (c == '-') minus = true, c = input_buffer[input_ptr_left++];
        x = 0;
        while (c >= '0')
            x = x * TEN + (c & MASK), c = input_buffer[input_ptr_left++];
        if constexpr (std::is_signed<T>::value == true)
            if (minus) x = -x;
    }

    inline void skip_space() {
        if (input_ptr_left + LEN > input_ptr_right) load();
        while (input_buffer[input_ptr_left] <= ' ') input_ptr_left++;
    }

    inline void flush() {
        fwrite_unlocked(std::begin(output_buffer), 1, output_ptr_right, stdout);
        output_ptr_right = 0;
    }

    inline void write_char(char c) {
        if (output_ptr_right > SZ - LEN) flush();
        output_buffer[output_ptr_right++] = c;
    }

    inline void write_bool(bool b) {
        if (output_ptr_right > SZ - LEN) flush();
        output_buffer[output_ptr_right++] = b ? '1' : '0';
    }

    inline void write_string(const std::string& s) {
        for (auto x : s) write_char(x);
    }

    inline void write_string(const char* s) {
        while (*s) write_char(*s++);
    }

    inline void write_string(char* s) {
        while (*s) write_char(*s++);
    }

    template <typename T>
    inline std::enable_if_t<std::is_integral_v<T>, void> write_int(T x) {
        if (output_ptr_right > SZ - LEN) flush();
        if (!x) {
            output_buffer[output_ptr_right++] = '0';
            return;
        }
        if constexpr (std::is_signed<T>::value == true)
            if (x < 0) output_buffer[output_ptr_right++] = '-', x = -x;
        int i = TWELVE;
        std::array<char, SIXTEEN> buf{};
        while (x >= TENTHOUSAND) {
            memcpy(std::begin(buf) + i,
                   std::begin(io_pre.num) + (x % TENTHOUSAND) * 4, 4);
            x /= TENTHOUSAND;
            i -= 4;
        }
        if (x < HUNDRED) {
            if (x < TEN) {
                output_buffer[output_ptr_right++] = static_cast<char>('0' + x);
            } else {
                std::uint32_t q =
                    (static_cast<std::uint32_t>(x) * MAGIC_MULTIPLY) >>
                    MAGIC_SHIFT;
                std::uint32_t r = static_cast<std::uint32_t>(x) - q * TEN;
                output_buffer[output_ptr_right] = static_cast<char>('0' + q);
                output_buffer[output_ptr_right + 1] =
                    static_cast<char>('0' + r);
                output_ptr_right += 2;
            }
        } else {
            if (x < THOUSAND) {
                memcpy(std::begin(output_buffer) + output_ptr_right,
                       std::begin(io_pre.num) + (x << 2) + 1, 3),
                    output_ptr_right += 3;
            } else {
                memcpy(std::begin(output_buffer) + output_ptr_right,
                       std::begin(io_pre.num) + (x << 2), 4),
                    output_ptr_right += 4;
            }
        }
        memcpy(std::begin(output_buffer) + output_ptr_right,
               std::begin(buf) + i + 4, TWELVE - i);
        output_ptr_right += TWELVE - i;
    }
    template <typename T_>
    IO& operator<<(T_&& x) {
        using T = typename std::remove_cv<
            typename std::remove_reference<T_>::type>::type;
        static_assert(is_custom<T>::value or is_default<T>::value or
                      is_iterable<T>::value or is_applyable<T>::value);
        if constexpr (is_custom<T>::value) {
            write_int(x.get());
        } else if constexpr (is_default<T>::value) {
            if constexpr (is_bool<T>::value) {
                write_bool(x);
            } else if constexpr (is_string<T>::value) {
                write_string(x);
            } else if constexpr (is_char<T>::value) {
                write_char(x);
            } else if constexpr (std::is_integral_v<T>) {
                write_int(x);
            }
        } else if constexpr (is_iterable<T>::value) {
            // strings are immune
            using E = decltype(*std::begin(x));
            constexpr char sep = needs_newline<E> ? '\n' : ' ';
            int i = 0;
            for (const auto& y : x) {
                if (i++) write_char(sep);
                operator<<(y);
            }
        } else if constexpr (is_applyable<T>::value) {
            // strings are immune
            constexpr char sep =
                (any_needs_newline<
                    T, std::make_index_sequence<std::tuple_size_v<T>>>::value)
                    ? '\n'
                    : ' ';
            int i = 0;
            std::apply(
                [this, &sep, &i](auto const&... y) {
                    (((i++ ? write_char(sep) : void()), this->operator<<(y)),
                     ...);
                },
                x);
        }
        return *this;
    }
    template <typename T>
    IO& operator>>(T& x) {
        static_assert(is_custom<T>::value or is_default<T>::value or
                      is_iterable<T>::value or is_applyable<T>::value);
        static_assert(!is_bool<T>::value);
        if constexpr (is_custom<T>::value) {
            typename T::internal_value_type y;
            read_int(y);
            x = y;
        } else if constexpr (is_default<T>::value) {
            if constexpr (is_string<T>::value) {
                read_string(x);
            } else if constexpr (is_char<T>::value) {
                read_char(x);
            } else if constexpr (std::is_integral_v<T>) {
                read_int(x);
            }
        } else if constexpr (is_iterable<T>::value) {
            for (auto& y : x) operator>>(y);
        } else if constexpr (is_applyable<T>::value) {
            std::apply([this](auto&... y) { ((this->operator>>(y)), ...); }, x);
        }
        return *this;
    }

    IO* tie(std::nullptr_t) { return this; }
    void sync_with_stdio(bool) {}
};
IO io;
// #define cin io
// #define cout io
// dont use ios_base, cin.tie, cout.tie

const int M = 1e3 + 5;
const int base = 1000000000; const int base_digits = 9;
struct bigint {
    vector<int> a; int sign;

    bigint() :
        sign(1) {
    }

    bigint(long long v) {
        *this = v;
    }

    bigint(const string &s) {
        read(s);
    }

    void operator=(const bigint &v) {
        sign = v.sign;
        a = v.a;
    }

    void operator=(long long v) {
        sign = 1;
        if (v < 0)
            sign = -1, v = -v;
        for (; v > 0; v = v / base)
            a.push_back(v % base);
    }

    bigint operator+(const bigint &v) const {
        if (sign == v.sign) {
            bigint res = v;

            for (int i = 0, carry = 0; i < (int) max(a.size(), v.a.size()) | carry; ++i) {
                if (i == (int) res.a.size())
                    res.a.push_back(0);
                res.a[i] += carry + (i < (int) a.size() ? a[i] : 0);
                carry = res.a[i] >= base;
                if (carry)
                    res.a[i] -= base;
            }
            return res;
        }
        return *this - (-v);
    }

    bigint operator-(const bigint &v) const {
        if (sign == v.sign) {
            if (abs() >= v.abs()) {
                bigint res = *this;
                for (int i = 0, carry = 0; i < (int) v.a.size() || carry; ++i) {
                    res.a[i] -= carry + (i < (int) v.a.size() ? v.a[i] : 0);
                    carry = res.a[i] < 0;
                    if (carry)
                        res.a[i] += base;
                }
                res.trim();
                return res;
            }
            return -(v - *this);
        }
        return *this + (-v);
    }

    void operator*=(int v) {
        if (v < 0)
            sign = -sign, v = -v;
        for (int i = 0, carry = 0; i < (int) a.size() || carry; ++i) {
            if (i == (int) a.size())
                a.push_back(0);
            long long cur = a[i] * (long long) v + carry;
            carry = (int) (cur / base);
            a[i] = (int) (cur % base);
            //asm("divl %ecx" : "=a"(carry), "=d"(a[i]) : "A"(cur), "c"(base));
        }
        trim();
    }

    bigint operator*(int v) const {
        bigint res = *this;
        res *= v;
        return res;
    }

    friend pair<bigint, bigint> divmod(const bigint &a1, const bigint &b1) {
        int norm = base / (b1.a.back() + 1);
        bigint a = a1.abs() * norm;
        bigint b = b1.abs() * norm;
        bigint q, r;
        q.a.resize(a.a.size());

        for (int i = a.a.size() - 1; i >= 0; i--) {
            r *= base;
            r += a.a[i];
            int s1 = r.a.size() <= b.a.size() ? 0 : r.a[b.a.size()];
            int s2 = r.a.size() <= b.a.size() - 1 ? 0 : r.a[b.a.size() - 1];
            int d = ((long long) base * s1 + s2) / b.a.back();
            r -= b * d;
            while (r < 0)
                r += b, --d;
            q.a[i] = d;
        }

        q.sign = a1.sign * b1.sign;
        r.sign = a1.sign;
        q.trim();
        r.trim();
        return make_pair(q, r / norm);
    }

    bigint operator/(const bigint &v) const {
        return divmod(*this, v).first;
    }

    bigint operator%(const bigint &v) const {
        return divmod(*this, v).second;
    }

    void operator/=(int v) {
        if (v < 0)
            sign = -sign, v = -v;
        for (int i = (int) a.size() - 1, rem = 0; i >= 0; --i) {
            long long cur = a[i] + rem * (long long) base;
            a[i] = (int) (cur / v);
            rem = (int) (cur % v);
        }
        trim();
    }

    bigint operator/(int v) const {
        bigint res = *this;
        res /= v;
        return res;
    }

    int operator%(int v) const {
        if (v < 0)
            v = -v;
        int m = 0;
        for (int i = a.size() - 1; i >= 0; --i)
            m = (a[i] + m * (long long) base) % v;
        return m * sign;
    }

    void operator+=(const bigint &v) {
        *this = *this + v;
    }
    void operator-=(const bigint &v) {
        *this = *this - v;
    }
    void operator*=(const bigint &v) {
        *this = *this * v;
    }
    void operator/=(const bigint &v) {
        *this = *this / v;
    }

    bool operator<(const bigint &v) const {
        if (sign != v.sign)
            return sign < v.sign;
        if (a.size() != v.a.size())
            return a.size() * sign < v.a.size() * v.sign;
        for (int i = a.size() - 1; i >= 0; i--)
            if (a[i] != v.a[i])
                return a[i] * sign < v.a[i] * sign;
        return false;
    }

    bool operator>(const bigint &v) const {
        return v < *this;
    }
    bool operator<=(const bigint &v) const {
        return !(v < *this);
    }
    bool operator>=(const bigint &v) const {
        return !(*this < v);
    }
    bool operator==(const bigint &v) const {
        return !(*this < v) && !(v < *this);
    }
    bool operator!=(const bigint &v) const {
        return *this < v || v < *this;
    }

    void trim() {
        while (!a.empty() && !a.back())
            a.pop_back();
        if (a.empty())
            sign = 1;
    }

    bool isZero() const {
        return a.empty() || (a.size() == 1 && !a[0]);
    }

    bigint operator-() const {
        bigint res = *this;
        res.sign = -sign;
        return res;
    }

    bigint abs() const {
        bigint res = *this;
        res.sign *= res.sign;
        return res;
    }

    long long longValue() const {
        long long res = 0;
        for (int i = a.size() - 1; i >= 0; i--)
            res = res * base + a[i];
        return res * sign;
    }

    friend bigint gcd(const bigint &a, const bigint &b) {
        return b.isZero() ? a : gcd(b, a % b);
    }
    friend bigint lcm(const bigint &a, const bigint &b) {
        return a / gcd(a, b) * b;
    }

    void read(const string &s) {
        sign = 1;
        a.clear();
        int pos = 0;
        while (pos < (int) s.size() && (s[pos] == '-' || s[pos] == '+')) {
            if (s[pos] == '-')
                sign = -sign;
            ++pos;
        }
        for (int i = s.size() - 1; i >= pos; i -= base_digits) {
            int x = 0;
            for (int j = max(pos, i - base_digits + 1); j <= i; j++)
                x = x * 10 + s[j] - '0';
            a.push_back(x);
        }
        trim();
    }

    friend istream& operator>>(istream &stream, bigint &v) {
        string s;
        stream >> s;
        v.read(s);
        return stream;
    }

    friend ostream& operator<<(ostream &stream, const bigint &v) {
        if (v.sign == -1)
            stream << '-';
        stream << (v.a.empty() ? 0 : v.a.back());
        for (int i = (int) v.a.size() - 2; i >= 0; --i)
            stream << setw(base_digits) << setfill('0') << v.a[i];
        return stream;
    }

    static vector<int> convert_base(const vector<int> &a, int old_digits, int new_digits) {
        vector<long long> p(max(old_digits, new_digits) + 1);
        p[0] = 1;
        for (int i = 1; i < (int) p.size(); i++)
            p[i] = p[i - 1] * 10;
        vector<int> res;
        long long cur = 0;
        int cur_digits = 0;
        for (int i = 0; i < (int) a.size(); i++) {
            cur += a[i] * p[cur_digits];
            cur_digits += old_digits;
            while (cur_digits >= new_digits) {
                res.push_back(int(cur % p[new_digits]));
                cur /= p[new_digits];
                cur_digits -= new_digits;
            }
        }
        res.push_back((int) cur);
        while (!res.empty() && !res.back())
            res.pop_back();
        return res;
    }

    typedef vector<long long> vll;

    static vll karatsubaMultiply(const vll &a, const vll &b) {
        int n = a.size();
        vll res(n + n);
        if (n <= 32) {
            for (int i = 0; i < n; i++)
                for (int j = 0; j < n; j++)
                    res[i + j] += a[i] * b[j];
            return res;
        }

        int k = n >> 1;
        vll a1(a.begin(), a.begin() + k);
        vll a2(a.begin() + k, a.end());
        vll b1(b.begin(), b.begin() + k);
        vll b2(b.begin() + k, b.end());

        vll a1b1 = karatsubaMultiply(a1, b1);
        vll a2b2 = karatsubaMultiply(a2, b2);

        for (int i = 0; i < k; i++)
            a2[i] += a1[i];
        for (int i = 0; i < k; i++)
            b2[i] += b1[i];

        vll r = karatsubaMultiply(a2, b2);
        for (int i = 0; i < (int) a1b1.size(); i++)
            r[i] -= a1b1[i];
        for (int i = 0; i < (int) a2b2.size(); i++)
            r[i] -= a2b2[i];

        for (int i = 0; i < (int) r.size(); i++)
            res[i + k] += r[i];
        for (int i = 0; i < (int) a1b1.size(); i++)
            res[i] += a1b1[i];
        for (int i = 0; i < (int) a2b2.size(); i++)
            res[i + n] += a2b2[i];
        return res;
    }

    bigint operator*(const bigint &v) const {
        vector<int> a6 = convert_base(this->a, base_digits, 6);
        vector<int> b6 = convert_base(v.a, base_digits, 6);
        vll a(a6.begin(), a6.end());
        vll b(b6.begin(), b6.end());
        while (a.size() < b.size())
            a.push_back(0);
        while (b.size() < a.size())
            b.push_back(0);
        while (a.size() & (a.size() - 1))
            a.push_back(0), b.push_back(0);
        vll c = karatsubaMultiply(a, b);
        bigint res;
        res.sign = sign * v.sign;
        for (int i = 0, carry = 0; i < (int) c.size(); i++) {
            long long cur = c[i] + carry;
            res.a.push_back((int) (cur % 1000000));
            carry = (int) (cur / 1000000);
        }
        res.a = convert_base(res.a, 6, base_digits);
        res.trim();
        return res;
    }
};

template <class T1, class T2>
    bool maximize(T1 &a, T2 b){
        if (a < b) {a = b; return true;}
        return false;
    }

template <class T1, class T2>
    bool minimize(T1 &a, T2 b){
        if (a > b) {a = b; return true;}
        return false;
    }

int n;
vector<int> g[N];

array<int, 3> edges[N];
int convert(const int &ID, const int &v) { 
    return v ^ edges[ID][0] ^ edges[ID][1]; 
}

vector<long long> dijkstra(const int &s) {
    vector<long long> d(n, 1e18); 
    d[s] = 0;
    set<pair<long long, long long>> st; 
    st.insert({d[s], s});

    while (!st.empty()) {
        int v = st.begin()->second;
        st.erase(st.begin());

        for (auto &id : g[v]) {
            int u = convert(id, v);
            int w = edges[id][2];

            if (d[u] > d[v] + w) {
                st.erase({d[u], u});
                d[u] = d[v] + w;
                st.insert({d[u], u});
            }
        }
    }
    return d;
}

__Art__ {

    ios_base::sync_with_stdio(false); 
    cin.tie(0); cout.tie(0);

    if (fopen("art.inp", "r")) {
        freopen("art.inp", "r", stdin);
        freopen("art.out", "w", stdout);
    }

    if (fopen("INCGRAPH.inp", "r")) {
        freopen("INCGRAPH.inp", "r", stdin);
        freopen("INCGRAPH.out", "w", stdout);
    }

    int m;
    cin >> n >> m;

    REP (i, m) {
        int v, u, w;
        cin >> v >> u >> w;

        edges[i] = {--v, --u, w};

        g[v].emplace_back(i);
        g[u].emplace_back(i);
    }

    vector<int> fs(m);
    for (int i = m - 2; ~i; --i) {
        fs[i] = max(fs[i + 1], edges[i + 1][2]);
    }

    auto d0 = dijkstra(0);
    auto d1 = dijkstra(n - 1);

    auto can = [&](const long long &x) -> bool {

        int timer = 0;
        vector<int> num(n), low(n), used(n);

        bool ok = 0;

        function<void(int,int)> dfs = [&](int v, int par) {
            used[v] = 1;
            num[v] = low[v] = timer++;

            for (auto &id : g[v]) {
                int u = convert(id, v);

                auto &[A, B, w] = edges[id];
                long long cs = min(d0[A] + d1[B], d1[A] + d0[B]) + w;

                if (cs > x || id == par) continue;

                if (used[u] == 1) {
                    minimize(low[v], num[u]);
                }
                else if (!used[u]) {
                    dfs(u, id);
                    minimize(low[v], low[u]);

                    if (low[u] > num[v] && num[n - 1] >= num[u] && cs + fs[id] > x) {
                        ok = 1;
                    }
                }
            }
            used[v] = 2;
        };
        dfs(0, -1);

        return ok;
    };

    long long l = d0[n - 1];
    long long r = d0[n - 1] + fs[0] + 10;
    long long res = l;

    while (l <= r) {
        long long m = l + (r - l) / 2;
        if (can(m)) {
            l = m + 1;
        }
        else {
            res = m;
            r = m - 1;
        }
    }
    cout << res;

    // cerr << "Time elapsed: " << 1.0 * clock() / CLOCKS_PER_SEC << "s\n";
    return 0;
}

Compilation message (stderr)

Aesthetic.cpp: In function 'int main()':
Aesthetic.cpp:900:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  900 |         freopen("art.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
Aesthetic.cpp:901:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  901 |         freopen("art.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Aesthetic.cpp:905:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  905 |         freopen("INCGRAPH.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
Aesthetic.cpp:906:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  906 |         freopen("INCGRAPH.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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