Submission #1001168

#	Time	Username	Problem	Language	Result	Execution time	Memory
1001168		shmax	Jousting tournament (IOI12_tournament)	C++17	49 / 100	1027 ms	6080 KiB

tournament

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>

//#pragma GCC optimize("O3")
//#pragma GCC target("avx,avx2,fma")
//#pragma GCC optimization ("unroll-loops")
//#pragma GCC target("avx,avx2,sse,sse2,sse3,sse4,popcnt")

using namespace std;
using namespace __gnu_pbds;
#define int long long
#define float long double
#define elif else if
#define endl "\n"
#define mod 1000000007
#define pi acos(-1)
#define eps 0.000000001
#define inf 1000'000'000'000'000'000LL
#define FIXED(a) cout << fixed << setprecision(a)
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define time_init auto start = std::chrono::high_resolution_clock::now()
#define time_report                                       \
        auto end = std::chrono::high_resolution_clock::now(); \
        std::cout << std::chrono::duration_cast<std::chrono::milliseconds>(end - start).count() << " ms" << endl
#define debug(x) \
        { cerr << #x << " = " << x << endl; }
#define len(x) (int) x.size()
#define sqr(x) ((x) * (x))
#define cube(x) ((x) * (x) * (x))
#define bit(x, i) (((x) >> (i)) & 1)
#define set_bit(x, i) ((x) | (1LL << (i)))
#define clear_bit(x, i) ((x) & (~(1LL << (i))))
#define toggle_bit(x, i) ((x) ^ (1LL << (i)))
#define low_bit(x) ((x) & (-(x)))
#define count_bit(x) __builtin_popcountll(x)
#define srt(x) sort(all(x))
#define rsrt(x) sort(rall(x))
#define mp make_pair
#define maxel(x) (*max_element(all(x)))
#define minel(x) (*min_element(all(x)))
#define maxelpos(x) (max_element(all(x)) - x.begin())
#define minelpos(x) (min_element(all(x)) - x.begin())
#define sum(x) (accumulate(all(x), 0LL))
#define product(x) (accumulate(all(x), 1LL, multiplies<int>()))
#define gcd __gcd
#define lcm(a, b) ((a) / gcd(a, b) * (b))
#define rev(x) (reverse(all(x)))
#define shift_left(x, k) (rotate(x.begin(), x.begin() + k, x.end()))
#define shift_right(x, k) (rotate(x.rbegin(), x.rbegin() + k, x.rend()))
#define is_sorted(x) (is_sorted_until(all(x)) == x.end())
#define is_even(x) (((x) &1) == 0)
#define is_odd(x) (((x) &1) == 1)
#define pow2(x) (1LL << (x))

struct custom_hash {
    static uint64_t splitmix64(uint64_t x) {
        // http://xorshift.di.unimi.it/splitmix64.c
        x += 0x9e3779b97f4a7c15;
        x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
        x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
        return x ^ (x >> 31);
    }

    size_t operator()(uint64_t x) const {
        static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();
        return splitmix64(x + FIXED_RANDOM);
    }
};

template<typename T>
using min_heap = priority_queue<T, vector<T>, greater<T>>;
template<typename T>
using max_heap = priority_queue<T, vector<T>, less<T>>;
template<typename T>
using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template<typename T>
using ordered_multiset = tree<T, null_type, less_equal<T>, rb_tree_tag, tree_order_statistics_node_update>;
template<typename T>
using matrix = vector<vector<T>>;
template<typename T>
using graph = vector<vector<T>>;
using hashmap = gp_hash_table<int, int, custom_hash>;

template<typename T>
vector<T> vect(int n, T val) {
    return vector<T>(n, val);
}

template<typename T>
vector<vector<T>> vect(int n, int m, T val) {
    return vector<vector<T>>(n, vector<T>(m, val));
}

template<typename T>
vector<vector<vector<T>>> vect(int n, int m, int k, T val) {
    return vector<vector<vector<T>>>(n, vector<vector<T>>(m, vector<T>(k, val)));
}

template<typename T>
vector<vector<vector<vector<T>>>> vect(int n, int m, int k, int l, T val) {
    return vector<vector<vector<vector<T>>>>(n, vector<vector<vector<T>>>(m, vector<vector<T>>(k, vector<T>(l, val))));
}

template<typename T>
matrix<T> new_matrix(int n, int m, T val) {
    return matrix<T>(n, vector<T>(m, val));
}

template<typename T>
graph<T> new_graph(int n) {
    return graph<T>(n);
}

template<class T, class S>
inline bool chmax(T &a, const S &b) {
    return (a < b ? a = b, 1 : 0);
}

template<class T, class S>
inline bool chmin(T &a, const S &b) {
    return (a > b ? a = b, 1 : 0);
}

using i8 = int8_t;
using i16 = int16_t;
using i32 = int32_t;
using i64 = int64_t;
using i128 = __int128_t;
using u8 = uint8_t;
using u16 = uint16_t;
using u32 = uint32_t;
using u64 = uint64_t;
using u128 = __uint128_t;

template<typename T>
using vec = vector<T>;

using pII = pair<int, int>;
template<typename T>
using enumerated = pair<T, int>;


struct PrefixSum {
    int n;
    vector<int> pref;

    explicit PrefixSum(const vector<int> &a) {
        n = len(a);
        pref = vect(n, 0LL);
        pref[0] = a[0];
        for (int i = 1; i < n; i++) {
            pref[i] = pref[i - 1] + a[i];
        }
    }

    int get(int l, int r) {
        if (l == 0) {
            return pref[r];
        } else {
            return pref[r] - pref[l - 1];
        }
    }
};

int solve(int n, int c, int R, const vec<int> &k, vec<pair<int, int>> segs) {
    vec<int> t(n, 2);
    auto disable = [&](int l, int r) {
        for (int i = l; i <= r; i++) {
            t[i] = 0;
        }
        t[l] = 1;
        t[r] = 1;
    };
    auto findk = [&](int id) {
        if (id == -1) return -1LL;
        for (int i = 0; i < n; i++) {
            id -= t[i];
            if (id <= 0) {
                return i;
            }
        }
        return n;
    };
    for (int i = 0; i < c; i++) {
        int f = findk(segs[i].first * 2 + 1);
        int s = findk(segs[i].second * 2 + 2);
        segs[i] = {f, s};
        disable(f, s);

    }

    int best = 0;
    int id = 0;
    vec<int> v(n);
    v[0] = 1;
    for (int i = 0; i < n - 1; i++)
        v[i + 1] = k[i] > R;
    PrefixSum ps(v);
    vec<int> d(n);

    auto inc = [&](int l, int r, int val) {
        for (int i = l; i <= r; i++) {
            d[i] += val;
        }
    };

    for (auto [l, r]: segs) {
        if (ps.get(l, r) > 1) continue;
        if (ps.get(l, r) == 0) {
            inc(l, r, 1);
        }
        if (ps.get(l, r) == 1 and v[l] == 1) {
            inc(l, r, 1);
        }
    }
    int best_id = 0;
    for (int i = 0; i < n; i++) {
        if (chmax(best, d[i])) {
            best_id = i;
        }
    }
    return best_id;
    //    for (int i = 0; i < n; i++) {
    //        vec<int> cur(n, -1);
    //        cur[i] = R;
    //        int ptr = 0;
    //        for (int j = 0; j < n; j++) {
    //            if (cur[j] != -1) continue;
    //            cur[j] = k[ptr++];
    //        }
    //        vec<int> b(n);
    //        for (int j = 0; j < n; j++) {
    //            b[j] = cur[j] > R;
    //        }
    //
    //        int ans = 0;
    //
    //        PrefixSum ps(b);
    //        for (auto [l, r]: segs) {
    //            if (r < i or l > i) continue;
    //            ans += ps.get(l, r) == 0;
    //        }
    //        if (chmax(best, ans)) {
    //            id = i;
    //        }
    //    }
    return id;
}

i32 GetBestPosition(i32 N, i32 C, i32 R, i32 *K, i32 *S, i32 *E) {
    vec<int> k(K, K + N - 1);
    vec<pair<int, int>> segs;
    for (int i = 0; i < C; i++) {
        segs.emplace_back(S[i], E[i]);
    }
    return solve(N, C, R, k, segs);
}

• Subtask 1: 17 / 17
• Subtask 2: 32 / 32
• Subtask 3: 0 / 51