Submission #1712240

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Source Code Expand

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

typedef long long ll;
#define REP(i,n) for(int i=0,_n=(int)(n);i<_n;++i)
template<class T>bool chmin(T&a,const T&b){return a>b?(a=b,true):false;}
template<class T>bool chmax(T&a,const T&b){return a<b?(a=b,true):false;}

int nextInt() { int x; scanf("%d", &x); return x;}

int C[110][110];
int acc[110][100];

int get(int i1, int j1, int i2, int j2) {
  return acc[i2][j2] - acc[i1][j2] - acc[i2][j1] + acc[i1][j1];
}

int main2() {
  int H = nextInt();
  int W = nextInt();
  REP(i, H) REP(j, W) {
    C[i][j] = nextInt();
    if ((i + j) % 2 == 1) C[i][j] *= -1;
  }

  memset(acc,0,sizeof(acc));
  for (int i = 1; i <= H; i++) {
    for (int j = 1; j <= W; j++) {
      acc[i][j] = -acc[i-1][j-1] + acc[i-1][j] + acc[i][j-1] + C[i-1][j-1];
    }
  }

  int ans = 0;
  for (int i2 = 0; i2 <= H; i2++)
  for (int i1 = 0; i1 < i2; i1++) {
      for (int j2 = 0; j2 <= W; j2++)
      for (int j1 = 0; j1 < j2; j1++) {
        if (get(i1, j1, i2, j2) == 0) {
          chmax(ans, (i2 - i1) * (j2 - j1));
        }
      }
  }
  cout << ans << endl;
  return 0;
}

int main() {
  for (;!cin.eof();cin>>ws) main2();
  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int nextInt()’:
./Main.cpp:9:39: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
 int nextInt() { int x; scanf("%d", &x); return x;}
                                       ^

Judge Result