Submission #1990229

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Source Code Expand

#include"bits/stdc++.h"
using namespace std;

int main() {
    int H, W;
    cin >> H >> W;
    vector<vector<int>> C(H, vector<int>(W));
    vector<vector<int>> sum(H + 1, vector<int>(W + 1, 0));

    for (int h = 1; h < H; h++) {
        for (int w = 1; w < W; w++) {
            cin >> sum[h][w];
            if ((h + w) % 2 == 1) {
                sum[h][w] *= -1;
            }
        }
    }

    vector<vector<int>> sum(H + 1, vector<int>(W + 1, 0));
    for (int h = 1; h <= H; h++) {
        for (int w = 1; w <= W; w++) {
            sum[h][w] += sum[h - 1][w] + sum[h][w - 1] - sum[h - 1][w - 1];
        }
    }

    int ans = 0;
    for (int left = 0; left < W; left++) {
        for (int right = left + 1; right <= W; right++) {
            for (int up = 0; up < H; up++) {
                for (int down = up + 1; down <= H; down++) {
                    if (sum[down][right] - sum[up][right] - sum[down][left] + sum[up][left] == 0) {
                        ans = max(ans, (down - up) * (right - left));
                    }
                }
            }
        }
    }

    cout << ans << endl;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:19:29: error: redeclaration of ‘std::vector<std::vector<int> > sum’
     vector<vector<int>> sum(H + 1, vector<int>(W + 1, 0));
                             ^
./Main.cpp:8:25: note: ‘std::vector<std::vector<int> > sum’ previously declared here
     vector<vector<int>> sum(H + 1, vector<int>(W + 1, 0));
                         ^