Submission #1011893

#	Time	Username	Problem	Language	Result	Execution time	Memory
1011893		mdn2002	Soccer Stadium (IOI23_soccer)	C++17	48 / 100	25 ms	18524 KiB

soccer

#include "soccer.h"
#include<bits/stdc++.h>
using namespace std;
int dp[33][33][33][33];
int biggest_stadium(int N, vector<vector<int>> F) {
    memset(dp, -1, sizeof dp);
    int n = N;
    vector<vector<int>> a = F, next(n, vector<int>(n));
    //vector dp(n, vector(n, vector(n, vector<int>(n, -1))));

    function<int(int, int, int, int)> f = [&] (int l, int r, int x, int y) {
        int ans = 0;
        if (dp[l][r][x][y] != -1) return dp[l][r][x][y];
        if (x - 1 >= 0) {
            for (int j = l; j <= r; j ++) {
                if (a[x - 1][j]) continue;
                int z = min(r, next[x - 1][j]);
                ans = max(ans, f(j, z, x - 1, y) + z - j + 1);
                j = z;
            }
        }
        if (y + 1 < n) {
            for (int j = l; j <= r; j ++) {
                if (a[y + 1][j]) continue;
                int z = min(r, next[y + 1][j]);
                ans = max(ans, f(j, z, x, y + 1) + z - j + 1);
                j = z;
            }
        }

        return dp[l][r][x][y] = ans;
    };

    for (int i = 0; i < n; i ++) {
        if (a[i][n - 1] == 0) next[i][n - 1] = n - 1;
        else next[i][n - 1] = n - 2;
        for (int j = n - 2; j >= 0; j --) {
            if (a[i][j]) next[i][j] = j - 1;
            else next[i][j] = next[i][j + 1];
        }
    }
    int ans = 0;
    for (int i = 0; i < n; i ++) {
        for (int j = 0; j < n; j ++) {
            if (a[i][j]) continue;
            ans = max(ans, f(j, next[i][j], i, i) + next[i][j] - j + 1);
            j = next[i][j];
        }
    }
    return ans;
}

• 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