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Cod sursa(job #567132)
#include<cstdio>
using namespace std;
int main()
{
freopen("flip.in","r",stdin);
freopen("flip.out","w",stdout);
int a[18][18],i,j,n,m,Si=0,Sf=0;;
scanf("%d %d",&n,&m);
a[0][0]=0;
for(i=1;i<=n;i++)
{for(j=1;j<=m;j++)
{scanf("%d ", &a[i][j]); Si=Si+a[i][j];}
if(Si<0) a[i][0]=1; else a[i][0]=0;
Si=0;
}
for(i=1;i<=m;i++)
{for(j=1;j<=n;j++)
Si=Si+a[i][j];
if(Si<0) a[0][i]=1; else a[0][i]=0;
Si=0;
}
for(i=1;i<=n;++i)
for(j=1;j<=m;++j)
if(a[0][j]!=a[i][0])
Sf=Sf-a[i][j];
else
Sf=Sf+a[i][j];
printf("%d\n",Sf);
return 0;
}