Submission #1036536

#	Time	Username	Problem	Language	Result	Execution time	Memory
1036536		adaawf	Bomb (IZhO17_bomb)	C++17	90 / 100	94 ms	55888 KiB

bomb

#include <iostream>
using namespace std;
char a[2505][2505];
int f[2505][2505], g[2505][2505], d[2505];
int main() {
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    int n, m;
    cin >> n >> m;
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= m; j++) {
            d[j] = n;
            cin >> a[i][j];
            if (a[i][j] == '1') f[i][j] = f[i - 1][j] + 1;
            else f[i][j] = 0;
        }
    }
    for (int i = n; i >= 1; i--) {
        for (int j = 1; j <= m; j++) {
            if (a[i][j] == '1') g[i][j] = g[i + 1][j] + 1;
            else g[i][j] = 0;
            if (a[i][j] == '1') {
                d[1] = min(d[1], f[i][j] + g[i][j] - 1);
            }
        }
    }
    int ma = m;
    for (int i = 1; i <= n; i++) {
        int h = n, k = n, c = 0;
        for (int j = 1; j <= m; j++) {
            if (a[i][j] == '1') {
                c++;
                h = min(h, f[i][j]);
                k = min(k, g[i][j]);
                d[c] = min(d[c], h + k - 1);
            }
            else {
                if (c != 0) ma = min(ma, c);
                c = 0;
                h = k = n;
            }
        }
        if (c != 0) ma = min(ma, c);
        h = k = n;
        c = 0;
        for (int j = m; j >= 1; j--) {
            if (a[i][j] == '1') {
                c++;
                h = min(h, f[i][j]);
                k = min(k, g[i][j]);
                d[c] = min(d[c], h + k - 1);
            }
            else {
                if (c != 0) ma = min(ma, c);
                c = 0;
                h = k = n;
            }
        }
        if (c != 0) ma = min(ma, c);
    }
    int res = -1e9;
    for (int i = 1; i <= ma; i++) {
        res = max(res, i * d[i]);
    }
    cout << res;
}

• Subtask 1: 90 / 100