Submission #1080678

#	Time	Username	Problem	Language	Result	Execution time	Memory
1080678		shmax	Closing Time (IOI23_closing)	C++17	0 / 100	1056 ms	36880 KiB

closing

#include "closing.h"
#include "bits/stdc++.h"

using namespace std;
using i32 = int;
#define int long long
#define len(x) (int)(x.size())
#define all(x) x.begin(), x.end()
#define inf 1000'000'000'000'000'000LL
#define bit(x, i) (((x) >> i) & 1)


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

i32 max_score(i32 N, i32 X, i32 Y, int K, std::vector<i32> U, std::vector<i32> V, std::vector<i32> W) {
    i32 ans = 0;
    vec<vec<pair<int, int>>> g(N);
    for (int i = 0; i < len(U); i++) {
        g[U[i]].emplace_back(V[i], W[i]);
        g[V[i]].emplace_back(U[i], W[i]);
    }
    auto dijkstra = [&](int start) {
        priority_queue<pair<int, int>, vec<pair<int, int>>, greater<>> pq;
        pq.emplace(0, start);
        vec<int> dists(N, inf);
        dists[start] = 0;
        while (!pq.empty()) {
            auto [cost, v] = pq.top();
            pq.pop();
            if (cost != dists[v]) continue;
            for (auto [u, w]: g[v]) {
                if (dists[u] > dists[v] + w) {
                    dists[u] = dists[v] + w;
                    pq.emplace(dists[u], u);
                }
            }
        }
        return dists;
    };
    auto dX = dijkstra(X);
    auto dY = dijkstra(Y);
    vec<pair<int, int>> v;
    for (int i = 0; i < N; i++) {
        v.emplace_back(min(dX[i], dY[i]), max(dX[i], dY[i]) - min(dX[i], dY[i]));
    }
    vec<int> rg(dX);
    for(auto h : dY) rg.push_back(h);
    sort(all(rg));
    int best = 0;
    int tK = K;
    for(int x : rg) {
        if(tK < x) break;
        tK -= x;
        best++;
    }
    for (int L = 0; L < N; L++) {
        for (int r = min(L, (int) X); r < N; r++) {
            int curK = K;
            vec<int> t;
            int cnt = 0;
            for (int k = L; k <= r; k++) {
                curK -= v[k].first;
                t.push_back(v[k].second);
                cnt++;
            }
            for (int k = r + 1; k <= Y; k++) {
                curK -= v[k].first;
                cnt++;
            }
            for (int k = r + 1; k < N; k++) {
                t.push_back(v[k].first);
            }
            if (curK < 0) break;
            sort(all(t));
            for (int x: t) {
                if (curK < x) break;
                curK -= x;
                cnt++;
            }
            best = max(best, cnt);
        }
    }
    return best;
}

Compilation message (stderr)

closing.cpp: In function 'i32 max_score(i32, i32, i32, long long int, std::vector<int>, std::vector<int>, std::vector<int>)':
closing.cpp:17:9: warning: unused variable 'ans' [-Wunused-variable]
   17 |     i32 ans = 0;
      |         ^~~

• Subtask 0: 0 / 0
• Subtask 1: 0 / 8
• Subtask 2: 0 / 9
• Subtask 3: 0 / 12
• Subtask 4: 0 / 14
• Subtask 5: 0 / 9
• Subtask 6: 0 / 11
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 17