Submission #854653

#	Time	Username	Problem	Language	Result	Execution time	Memory
854653		DAleksa	Strah (COCI18_strah)	C++17	55 / 110	1096 ms	71680 KiB

strah

#include <bits/stdc++.h>

using namespace std;

const int N = 2e3 + 10;
int n, m;
string a[N];
long long dp[N][N];
int mn_left[N][N], mn_right[N][N];

long long calc(int l, int r) {
    if(l == r) {
        long long ans = 0;
        int lst = -1;
        for(int i = 0; i < n; i++) {
            if(a[i][l] == '#') lst = i;
            ans += (i - lst) * 1LL * (i - lst + 1) / 2;
        }
        return ans;
    }
    int mid = (l + r) / 2;
    vector<int> left(n, 0), right(n, 0);
    for(int i = 0; i < n; i++) {
        for(int j = mid; j >= l; j--) {
            if(a[i][j] == '.') left[i]++;
            else break;
        }
        for(int j = mid + 1; j <= r; j++) {
            if(a[i][j] == '.') right[i]++;
            else break;
        }
    }
    for(int i = 0; i < n; i++) {
        mn_left[i][i] = left[i];
        mn_right[i][i] = right[i];
    }
    for(int i = 0; i < n; i++) {
        for(int j = i + 1; j < n; j++) {
            mn_left[i][j] = min(mn_left[i][j - 1], left[j]);
            mn_right[i][j] = min(mn_right[i][j - 1], right[j]);
        }
    }
    long long ans = 0;
    for(int i = 0; i < n; i++) for(int j = i; j < n; j++) ans += (j - i + 1) * 1LL * dp[mn_left[i][j]][mn_right[i][j]];
    return ans + calc(l, mid) + calc(mid + 1, r);
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cin >> n >> m;
    for(int i = 1; i <= m; i++) for(int j = 1; j <= m; j++) dp[i][j] = dp[i][j - 1] + dp[i - 1][j] - dp[i - 1][j - 1] + i + j;
    for(int i = 0; i < n; i++) cin >> a[i];
    cout << calc(0, m - 1);
    return 0;
}

• Subtask 1: 11 / 11
• Subtask 2: 11 / 11
• Subtask 3: 11 / 11
• Subtask 4: 11 / 11
• Subtask 5: 11 / 11
• Subtask 6: 0 / 11
• Subtask 7: 0 / 11
• Subtask 8: 0 / 11
• Subtask 9: 0 / 11
• Subtask 10: 0 / 11