oj.uz

Submission #1011921

# Submission time Handle Problem Language Result Execution time Memory
1011921 2024-07-01T11:05:37 Z mdn2002 Soccer Stadium (IOI23_soccer) C++17
0 / 100
 6 ms 15964 KB 
#include "soccer.h"
#include<bits/stdc++.h>
using namespace std;
int dp[2002][2002];
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)), sum(n, vector<int>(n));

    function<int(int, int, int, int)> summ = [&] (int l, int r, int x, int y) {
        long long ans = sum[y][r];
        if (x - 1 >= 0) ans -= sum[x - 1][r];
        if (l - 1 >= 0) ans -= sum[y][l - 1];
        if (x - 1 >= 0 && l - 1 >= 0) ans += sum[x - 1][l - 1];
        return ans;
    };
    function<int(int, int, int, int)> f = [&] (int l, int r, int x, int y) {
        int ans = 0;
        if (dp[l][x] != -1) return dp[l][x];
        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]);
                int ll = y + 1, rr = n, mid;
                while (ll < rr) {
                    mid = (ll + rr) / 2;
                    if (summ(j, z, x, mid) == 0) ll = mid + 1;
                    else rr = mid;
                }
                ll --;
                ans = max(ans, f(j, z, x, ll) + (z - j + 1) * (ll - y));
                j = z;
            }
        }

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

    for (int i = 0; i < n; i ++) {
        for (int j = 0; j < n; j ++) {
            sum[i][j] += a[i][j];
            if (j) sum[i][j] += sum[i][j - 1];
        }
    }
    for (int i = 1; i < n; i ++) {
        for (int j = 0; j < n; j ++) sum[i][j] += sum[i - 1][j];
    }
    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;
            int ll = i, rr = n, mid;
            while (ll < rr) {
                mid = (ll + rr) / 2;
                if (summ(j, next[i][j], i, mid) == 0) ll = mid + 1;
                else rr = mid;
            }
            ll --;
            ans = max(ans, f(j, next[i][j], i, ll) + (next[i][j] - j + 1) * (ll - i + 1));
            j = next[i][j];
        }
    }
    return ans;
}

Subtask #0
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 15964 KB ok

Subtask #1
0.0 / 6.0

# Verdict Execution time Memory Grader output
1 Incorrect 6 ms 15960 KB wrong
2 Halted 0 ms 0 KB -

Subtask #2
0.0 / 8.0

# Verdict Execution time Memory Grader output
1 Incorrect 6 ms 15960 KB wrong
2 Halted 0 ms 0 KB -

Subtask #3
0.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 15964 KB ok
2 Incorrect 6 ms 15960 KB wrong
3 Halted 0 ms 0 KB -

Subtask #4
0.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 15964 KB ok
2 Incorrect 6 ms 15960 KB wrong
3 Halted 0 ms 0 KB -

Subtask #5
0.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 15964 KB ok
2 Incorrect 6 ms 15960 KB wrong
3 Halted 0 ms 0 KB -

Subtask #6
0.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 15964 KB ok
2 Incorrect 6 ms 15960 KB wrong
3 Halted 0 ms 0 KB -