Submission #1996574

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Source Code Expand

#include<bits/stdc++.h>
#define L long long
#define pb push_back
#define pi pair<int,int>
#define pii pair<pair<int,int>,int>
#define aa first
#define bb second
#define mp make_pair
#define mpp(a,b,c) mp(mp(a,b),c)
using namespace std;
int n,m,x[2010][2010],w[2010][2010],f[2010],q,p;
char s[2010][2010];
int main()
{
	//freopen(".in","r",stdin);
	//freopen(".out","w",stdout);
	int i,j;
	scanf("%d%d",&n,&m);
	for(i=1;i<=n;i++)
	  scanf("%s",&s[i][0]+1);
	for(i=1;i<n;i++)
	  for(j=1;j<m;j++)
		if((s[i][j]=='#')^(s[i+1][j]=='#')^(s[i][j+1]=='#')^(s[i+1][j+1]=='#')^1)
		  x[i][j]=1,w[i][j]=w[i-1][j]+1;
	p=max(n,m);
	for(i=1;i<n;i++)
	  {
	   q=0;
	   for(j=1;j<m;j++)
	     {
		  while(q && w[i][j]<w[i][f[q]])
		    {
			 p=max(p,(w[i][f[q]]+1)*(j-f[q-1]));
		     q--;
			}
		  f[++q]=j;
		 }
	   for(j=1;j<=q;j++)
	     p=max(p,(m-f[j-1])*(w[i][f[j]]+1));
	  }
	printf("%d\n",p);
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:18:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&n,&m);
                     ^
./Main.cpp:20:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
    scanf("%s",&s[i][0]+1);
                          ^

Judge Result