Submission #697342

#	Time	Username	Problem	Language	Result	Execution time	Memory
697342		allllekssssa	Bomb (IZhO17_bomb)	C++14	18 / 100	1100 ms	56380 KiB

bomb

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


#define pii pair<int ,int>
#define pb push_back

const int maxN = 2600;
int n, m;
int a[maxN][maxN];
int d[maxN][maxN];
int c[maxN][maxN];
string s;
int cnt[maxN];

int getDSum(int x1, int y1, int x2, int y2) {
	if (x2 > n || y2 > m) return 0;
	return d[x2][y2] + d[x1 - 1][y1 - 1] - d[x1 - 1][y2] - d[x2][y1 - 1];
}
 
int heuristic1() {
    
	vector<pii> gornji;

	for (int i = 1; i<=n; i++) {
		for (int j = 1; j<=m; j++) {
			if (a[i - 1][j] == 0 && a[i][j - 1] == 0 && a[i][j] == 1) gornji.pb({i, j});
		}
	}

    
    for (int i = 1; i <=n; i++) {
    	cnt[i] = m;
    }

      for (int i = 0; i < gornji.size(); i++) {
       for (int len = 1; len <= n; len++) {
          
          int width = m;
          int x = gornji[i].first;
          int y = gornji[i].second;


          while ((width > 0 || cnt[len]) && getDSum(x, y, x + len - 1, y + width - 1) != len * width) width--;
       	  cnt[len] = min(cnt[len], width);
       }
    }


    int ans = 0;
    for (int i = 1; i<=n; i++) {
    	ans = max(ans, i * cnt[i]);
    }

    return ans;
}

int main() {
 
	cin >> n >> m;
 
	for (int i = 1; i <=n; i++) {
		cin >> s;
 
		for (int j = 0; j < m; j++) {
			a[i][j + 1] = s[j] - '0';
		}
	}
    
    for (int i = 1; i <= n; i++) {
		for (int j = 1; j<=m; j++) {
			d[i][j] = d[i - 1][j] + d[i][j - 1] + a[i][j] - d[i - 1][j - 1];
		}
	}
    
    cout << heuristic1() << endl;
}

Compilation message (stderr)

bomb.cpp: In function 'int heuristic1()':
bomb.cpp:37:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |       for (int i = 0; i < gornji.size(); i++) {
      |                       ~~^~~~~~~~~~~~~~~

• Subtask 1: 18 / 100