> #include <cstring>
> #include <cstdio>
> using namespace std;
> #define _int64 long long int
> _int64 a[501][501],b[501][501];
> _int64 abs(_int64 a) { return (a>0) ? a : -a; }
> int m,n;
> int main()
> {
> 	while(scanf("%d %d",&m,&n)==2) {
> 		if(!m&&!n) break;
> 		_int64 min=(_int64)65535*500*500;
> 		for(int i=1;i<=m;i++)
> 			for(int j=1;j<=n;j++) scanf("%lld",&a[i][j]);
> 		for(int i=1;i<=m;i++)
> 			for(int j=1;j<=n;j++) b[i][j]=b[i-1][j]+b[i][j-1]-b[i-1][j-1]+a[i][j];
> 		for(int i=1;i<m;i++)
> 			for(int j=1;j<n;j++) {
> 				_int64 x=b[i][j],y=b[m][j]-b[i][j],
> 				    z=b[m][n]-b[m][j];
> 				_int64 t=abs(x-y)+abs(y-z)+abs(z-x);
> 				if(t<min) min=t;
> 				x=b[i][j],y=b[m][n]-b[m][j],z=b[m][j]-b[i][j];
> 				t=abs(x-y)+abs(y-z)+abs(z-x);
> 				if(t<min) min=t;
> 			}
> 		for(int i=2;i<=m;i++)
> 			for(int j=2;j<=n;j++) {
> 				_int64 x=b[i-1][n],y=b[m][j-1]-b[i-1][j-1],z=b[m][n]-b[i-1][n]-b[m][j-1]+b[i-1][j-1];
> 				_int64 t=abs(x-y)+abs(y-z)+abs(z-x);
> 				if(t<min) min=t;
> 				x=b[m][j-1],y=b[i-1][n]-b[i-1][j-1],z=b[m][n]-b[i-1][n]-b[m][j-1]+b[i-1][j-1];
> 				t=abs(x-y)+abs(y-z)+abs(z-x);
> 				if(t<min) min=t;
> 			}
> 		for(int i=1;i<m-1;i++)
> 			for(int j=i+1;j<m;j++) {
> 				_int64 x=b[i][n],y=b[j][n]-b[i][n],z=b[m][n]-b[j][n];
> 				_int64 t=abs(x-y)+abs(y-z)+abs(z-x);
> 				if(t<min) min=t;
> 			}
> 		for(int i=1;i<n-1;i++)
> 			for(int j=i+1;j<n;j++) {
> 				_int64 x=b[m][i],y=b[m][j]-b[m][i],z=b[m][n]-b[m][j];
> 				_int64 t=abs(x-y)+abs(y-z)+abs(z-x);
> 				if(t<min) min=t;
> 			}
> 		printf("%lld\n",min);
> 	}
> }
> --
> I have considerd 4 ways of partition. But still GET WA.

• Re:try using printf("%I64d",...) to output long long, using "%lld" seems to produce wa in many cases (45) b4die 2005-07-22 13:49:46
  • I agree with you! (51) Sempr 2006-06-05 23:02:58
    • just do it (0) frkstyc 2006-06-05 23:10:01
      • but I failed again and again! (0) oeym 2006-06-06 08:47:57
        • 晕死！！忘了在函数里写 return WA了我一个早晨.....不过....为什么我本地编译并且调试正确了呢？？ (0) Sempr 2006-06-06 09:24:40
  • Re:try using printf("%I64d",...) to output long long, using "%lld" seems to produce wa in many cases (51) 1272406003 2009-10-26 22:12:33