Submission #963373

#	Time	Username	Problem	Language	Result	Execution time	Memory
963373		tutis	Soccer Stadium (IOI23_soccer)	C++17	0 / 100	4539 ms	55192 KiB

soccer

#include "soccer.h"

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

int biggest_stadium(int N, std::vector<std::vector<int>> C) {
    vector<vector<int>> S(N);
    auto fS = [&](int x, int y) {
        if (x < 0 || y < 0) {
            return 0;
        }
        return S[x][y];
    };
    auto sm = [&](int x1, int x2, int y1, int y2) -> int {
        return fS(x2, y2) - fS(x1 - 1, y2) - fS(x2, y1 - 1) + fS(x1 - 1, y1 - 1);
    };
    for (int i = 0; i < N; i++) {
        S[i] = vector<int>(N);
        for (int j = 0; j < N; j++) {
            S[i][j] = C[i][j];
            S[i][j] += fS(i - 1, j) + fS(i, j - 1) - fS(i - 1, j - 1);
        }
    }
    int best = 0;
    for (int x = 0; x < N; x++) {
        for (int y = 0; y < N; y++) {
            if (C[x][y] == 1) {
                continue;
            }
            int x0 = x;
            int x1 = x;
            int y0 = y;
            int y1 = y;
            while (x0 - 1 >= 0 && C[x0 - 1][y] == 0) {
                x0--;
            }
            while (x1 + 1 < N && C[x1 + 1][y] == 0) {
                x1++;
            }
            while (y0 - 1 >= 0 && C[x][y0 - 1] == 0) {
                y0--;
            }
            while (y1 + 1 < N && C[x][y1 + 1] == 0) {
                y1++;
            }
            int p = 0;
            int mx = y1;
            int mn = y0;
            for (int i = x; i <= x1; i++) {
                while (sm(i, i, y, mx) != 0) {
                    mx--;
                }
                while (sm(i, i, mn, y) != 0) {
                    mn++;
                }
                p += mx - mn + 1;
             //   cout<<i<<" "<<mn<<" "<<mx<<endl;
            }
            mx = y1;
            mn = y0;
            for (int i = x - 1; i >= x0; i--) {
                while (sm(i, i, y, mx) != 0) {
                    mx--;
                }
                while (sm(i, i, mn, y) != 0) {
                    mn++;
                }
                p += mx - mn + 1;
              //  cout<<i<<" "<<mn<<" "<<mx<<endl;
            }
//            cout<<endl;
            best = max(best, p);
        }
    }
    return best;
}

//int main() {
//    std::cout << biggest_stadium(3, {{1, 0, 0},
//                                     {0, 0, 1},
//                                     {1, 0, 1}}) << std::endl;
//    return 0;
//}

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