제출 #927440

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
927440		aykhn	봉쇄 시간 (IOI23_closing)	C++17	8 / 100	116 ms	37316 KiB

closing

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

using namespace std;

struct BIT
{
    int n;
    vector<long long> ft;
    void init(int N)
    {
        n = N + 5;
        ft.assign(n + 5, 0);
    }
    void add(int pos, long long val)
    {
        for (pos = pos + 1; pos <= n; pos += pos & -pos) ft[pos] += val;
    }
    long long get(int pos, long long res = 0)
    {
        for (pos = pos + 1; pos > 0; pos -= pos & -pos) res += ft[pos];
        return res;
    }
};

const int MXN = 2e5 + 5;

int n, x, y;
long long k;
vector<array<long long, 2>> adj[MXN];
long long d[2][MXN], p[3][MXN];

void dfs(int a, int p, int t)
{
    for (const array<long long, 2> &v : adj[a])
    {
        if (v[0] == p) continue;
        d[t][v[0]] = d[t][a] + v[1];
        dfs(v[0], a, t);
    }
}

int max_score(int N, int X, int Y, long long K, vector<int> U, vector<int> V, vector<int> W)
{
    n = N, x = X, y = Y, k = K;
    for (int i = 0; i < n; i++)
    {
        d[0][i] = d[1][i] = 0;
        adj[i].clear();
    }
    int f = 1;
    for (int i = 0; i < n - 1; i++)
    {
        adj[U[i]].push_back({V[i], W[i]});
        adj[V[i]].push_back({U[i], W[i]});
        f &= U[i] == i && V[i] == i + 1;
    }
    dfs(x, x, 0);
    dfs(y, y, 1);
    int ans = 0;
    {
        vector<long long> v;
        for (int i = 0; i < n; i++) v.push_back(min(d[0][i], d[1][i]));
        sort(v.begin(), v.end());
        long long k1 = k;
        for (int i = 0; i < n; i++)
        {
            k1 -= v[i];
            if (k1 < 0) break;
            ans++;
        }
    }
    if (!f) return ans;
    for (int j = 0; j < 3; j++)
    {
        for (int i = 0; i < N; i++)
        {
            if (j < 2) p[j][i] = (i ? p[j][i - 1] : 0) + d[j][i];
            else p[j][i] = (i ? p[j][i - 1] : 0) + max(d[0][i], d[1][i]);
        }
    }
    for (int i = 0; i < n; i++)
    {
        BIT ft, cnt;
        ft.init(n), cnt.init(n);
        vector<array<long long, 2>> v;
        vector<int> idx(n, -1);
        for (int j = 0; j < min(i, X); j++) v.push_back({d[0][j], j});
        for (int j = max(i, Y) + 1; j < n; j++) v.push_back({d[1][j], j});
        sort(v.begin(), v.end());
        for (int j = 0; j < v.size(); j++)
        {
            idx[v[j][1]] = j;
            ft.add(j, v[j][0]);
            cnt.add(j, 1);
        }
        for (int j = i; j < n; j++)
        {
            if (max(i, X) > min(j, Y)) continue;
            long long k1 = k - (p[2][j] - (i ? p[2][i - 1] : 0));
            if (X < i) k1 -= p[0][i - 1] - (X ? p[0][X - 1] : 0);
            if (j < Y) k1 -= p[1][Y] - p[1][j];
            if (k1 < 0) continue;
            int res = max(j, Y) - min(i, X) + 1 + (j - i + 1); 
            int l = 0, r = n - 1;
            while (l < r)
            {
                int mid = (l + r + 1) >> 1;
                if (ft.get(mid) <= k1) l = mid;
                else r = mid - 1;
            }
            if (ft.get(l) <= k1) res += cnt.get(l);
            ans = max(ans, res);
            if (idx[j] != -1) ft.add(idx[j], -v[idx[j]][0]), cnt.add(idx[j], -1);
        }
    }
    return ans;
}

컴파일 시 표준 에러 (stderr) 메시지

closing.cpp: In function 'int max_score(int, int, int, long long int, std::vector<int>, std::vector<int>, std::vector<int>)':
closing.cpp:91:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::array<long long int, 2> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   91 |         for (int j = 0; j < v.size(); j++)
      |                         ~~^~~~~~~~~~

• Subtask 0: 0 / 0
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• Subtask 2: 0 / 9
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• Subtask 4: 0 / 14
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• Subtask 9: 0 / 17