Submission #1036613

#	Time	Username	Problem	Language	Result	Execution time	Memory
1036613		belgianbot	Commuter Pass (JOI18_commuter_pass)	C++17	100 / 100	178 ms	28620 KiB

commuter_pass

#include <bits/stdc++.h>
#define ll long long
#define fi first
#define se second

using namespace std;
namespace std {

// https://judge.yosupo.jp/submission/193613
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++) for (int n = i, j = 3; j >= 0; j--) num[i * 4 + j] = 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<typename T> static constexpr bool is_char_v    = std::is_same_v<T, char>;
    template<typename T> static constexpr bool is_bool_v    = std::is_same_v<T, bool>;
    template<typename T> static constexpr bool is_string_v  =
            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<typename T> static constexpr bool is_default_v =
            is_char_v<T> || is_bool_v<T> || is_string_v<T> || std::is_integral_v<T>;

    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 +
            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<typename 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_v<T>) if (x < 0) output_buffer[output_ptr_right++] = '-', x = -x;
        int i = TWELVE;
        std::array<char, SIXTEEN> buf{};
        for (; x >= TENTHOUSAND; x /= TENTHOUSAND, i -= 4)
            memcpy(std::begin(buf) + i, std::begin(io_pre.num) + (x % TENTHOUSAND) * 4, 4);
        if (x < HUNDRED) {
            if (x < TEN) output_buffer[output_ptr_right++] = '0' + x;
            else {
                uint32_t q = (uint32_t(x) * MAGIC_MULTIPLY) >> MAGIC_SHIFT;
                uint32_t r = uint32_t(x) - q * TEN;
                output_buffer[output_ptr_right++] = '0' + q;
                output_buffer[output_ptr_right++] = '0' + r;
            }
        } 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_>
    std::enable_if_t<(is_default_v< std::remove_cv_t< std::remove_reference_t<T_> > >), IO&> operator<<(T_&& x) {
        using T = std::remove_cv_t< std::remove_reference_t<T_> >;
        if constexpr (is_bool_v<T>) write_bool(x);
        else if constexpr (is_string_v<T>) write_string(x);
        else if constexpr (is_char_v<T>) write_char(x);
        else if constexpr (std::is_integral_v<T>) write_int(x);
        return *this;
    }

    template<typename T>
    std::enable_if_t<(is_default_v<T> && !is_bool_v<T>), IO&> operator>>(T& x) {
        if constexpr (is_string_v<T>) read_string(x);
        else if constexpr (is_char_v<T>) read_char(x);
        else if constexpr (std::is_integral_v<T>) read_int(x);
        return *this;
    }

    IO* tie(std::nullptr_t) { return this; }
    void sync_with_stdio(bool) {}
} io;

} // namespace std

using std::io;

#define cin io
#define cout io

ll MAX = 1e18;
int N, M, S, T, U, V;
ll answer;
vector<vector<pair<int,ll>>> adj;
vector<bool> processed;
vector<ll> distS, distT, distU, distV;
vector<pair<ll,ll>> memo;
 
pair<ll, ll> res(int pos) {
	if (pos == T) return {distU[T], distV[T]};
	if (memo[pos].fi < MAX) return memo[pos];
		
	processed[pos] = true;
	pair<ll, ll> best = {MAX, MAX};
	for (pair<int,ll> x : adj[pos]) {
		if (!processed[x.fi]) {
			if (distT[x.fi] + distS[x.fi] == distS[T] && distS[pos] + x.se == distS[x.fi]) {
				pair<ll, ll> func = res(x.fi);
				if (distU[pos] <= func.fi) { func.fi = distU[pos]; answer = min(answer, func.fi + func.se); }
				if (distV[pos] <= func.se) { func.se = distV[pos]; answer = min(answer, func.fi + func.se); }
				best.fi = min(best.fi, func.fi);
				best.se = min(best.se, func.se);
				
			}
		}
	}
	processed[pos] = false;
	return memo[pos] = best;
	
}
				
		
			
  int main() {
	ios::sync_with_stdio(false);
	cin.tie(0); cout.tie(0);
	cin >> N >> M >> S >> T >> U >> V;
	S--; T--; U--; V--;
	
	adj.resize(N); memo.resize(N, {MAX, MAX}); processed.resize(N, false);
	for (int i = 0; i < M; i++) {
		int a, b; ll c; cin >> a >> b >> c;
		a--, b--;
		adj[a].push_back({b,c});
		adj[b].push_back({a,c});
	}
	distS.resize(N, MAX); distT.resize(N, MAX); distU.resize(N, MAX); distV.resize(N, MAX);
	priority_queue < pair<ll, int>, vector<pair<ll, int>>, greater<pair<ll,int>>> q;
	
	q.push({0, S}); distS[S] = 0;
	while (!q.empty()) {
		int x = q.top().se; q.pop();
		if (processed[x]) continue;
		
		processed[x] = true;
		for (pair<int,ll> w : adj[x]) {
			if (distS[w.fi] > distS[x] + w.se) {
				distS[w.fi] = distS[x] + w.se;
				q.push({distS[w.fi], w.fi});
			}
		}
	}
	processed.clear(); processed.resize(N, false);
	q.push({0,T}); distT[T] = 0;
	while (!q.empty()) {
		int x = q.top().se; q.pop();
		if (processed[x]) continue;
		
		processed[x] = true;
		for (pair<int,ll> w : adj[x]) {
			if (distT[w.fi] > distT[x] + w.se) {
				distT[w.fi] = distT[x] + w.se;
				q.push({distT[w.fi], w.fi});
			}
		}
	}
	processed.clear(); processed.resize(N,false);
	q.push({0,U}); distU[U] = 0;
	
	while (!q.empty()) {
		int x = q.top().se; q.pop();
		if (processed[x]) continue;
		
		processed[x] = true;
		for (pair<int,ll> w : adj[x]) {
			if (distU[w.fi] > distU[x] + w.se) {
				distU[w.fi] = distU[x] + w.se;
				q.push({distU[w.fi], w.fi});
			}
		}
	}
	
	processed.clear(); processed.resize(N, false);
	q.push({0, V}); distV[V] = 0;
	
	while (!q.empty()) {
		int x = q.top().se; q.pop();
		if (processed[x]) continue;
		
		processed[x] = true;
		for (pair<int,ll> w : adj[x]) {
			if (distV[w.fi] > distV[x] + w.se) {
				distV[w.fi] = distV[x] + w.se;
				q.push({distV[w.fi], w.fi});
			}
		}
	}
	//cout << distS[11] + distT[11] << '\n';
	processed.clear(); processed.resize(N, false);
	answer = min(distU[T] + distV[T], distU[V]);
 
	res(S);
	cout << answer;
		
	return 0;
}

• Subtask 1: 16 / 16
• Subtask 2: 15 / 15
• Subtask 3: 24 / 24
• Subtask 4: 45 / 45