Submission #928150

#	Time	Username	Problem	Language	Result	Execution time	Memory
928150		aykhn	Soccer Stadium (IOI23_soccer)	C++17	48 / 100	30 ms	14428 KiB

soccer

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

using namespace std;

int n;
vector<vector<int>> A;
int dp[31][31][31][31];
int cur;

int f(int i, int pos, int l, int r)
{
    if (i < 0 || i >= n) return 0;
    if (l > r) return 0;
    if (pos >= n) return 0;
    if (dp[i][pos][l][r] != -1) return dp[i][pos][l][r];
    vector<int> v;
    v.push_back(l - 1);
    for (int j = l; j <= r; j++) if (A[i][j]) v.push_back(j);
    v.push_back(r + 1);
    int res = 0;
    for (int j = 1; j < v.size(); j++)
    {
        if (i <= cur) 
        {
            res = max(res, f(i - 1, pos + 1, v[j - 1] + 1, v[j] - 1) + (v[j] - v[j - 1] - 1));
            res = max(res, f(cur + (pos - (cur - i)) + 1, pos + 1, v[j - 1] + 1, v[j] - 1) + (v[j] - v[j - 1] - 1));
        }
        else
        {
            res = max(res, f(i + 1, pos + 1, v[j - 1] + 1, v[j] - 1) + (v[j] - v[j - 1] - 1));
            res = max(res, f(cur - (pos - (i - cur)) - 1, pos + 1, v[j - 1] + 1, v[j] - 1) + (v[j] - v[j - 1] - 1));
        }
    }
    return dp[i][pos][l][r] = res;
}

int solve()
{
    for (int i = 0; i < 31; i++)
    {
        for (int j = 0; j < 31; j++)
        {
            for (int k = 0; k < 31; k++)
            {
                for (int l = k; l < 31; l++) dp[i][j][k][l] = -1;
            }
        }
    }
    return f(cur, 0, 0, n - 1);
}

int biggest_stadium(int N, vector<vector<int>> B)
{
    n = N;
    A = B;
    int res = 0;
    for (cur = 0; cur < n; cur++)
    {
        res = max(res, solve());
    }
    return res;
}

Compilation message (stderr)

soccer.cpp: In function 'int f(int, int, int, int)':
soccer.cpp:22:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |     for (int j = 1; j < v.size(); j++)
      |                     ~~^~~~~~~~~~

• Subtask 0: 0 / 0
• Subtask 1: 0 / 6
• Subtask 2: 8 / 8
• Subtask 3: 22 / 22
• Subtask 4: 18 / 18
• Subtask 5: 0 / 16
• Subtask 6: 0 / 30