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Cod sursa(job #113014)
#include<stdio.h>
#include<math.h>
int main()
{
freopen ("flip.in","r",stdin);
freopen("flip.out","w",stdout);
int s=0,i,j,n,m,mat[6][6];
scanf("%d",&n);
scanf("%d",&m);
for (i=0;i<n;i++)
for (j=0;j<m;j++)
scanf("%d",&mat[i][j]);
for (i=0;i<n;i++)
{
for (j=0;j<m;j++)
s+=mat[i][j];
if (s<0)
{
for (j=0;j<m;j++)
mat[i][j]=mat[i][j]*(-1);
}
}
s=0;
for (j=0;j<m;j++)
{
for (i=0;i<n;i++)
s+=mat[i][j];
if (s<0)
{
for (i=0;i<n;i++)
mat[i][j]=mat[i][j]*(-1);
}
}
s=0;
for (i=0;i<n;i++)
for (j=0;j<m;j++)
s+=mat[i][j];
printf("%d",s);
return 0;
}