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Cod sursa(job #266241)
#include <stdio.h>
int v[17][17],c[16],r[16],n,m,i,j,s;
void main()
{
freopen("flip.in","r", stdin);
freopen("flip.out","w",stdout);
scanf("%d", &n);
scanf("%d", &m);
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
scanf("%d", &v[i][j]);
for(i=1;i<=n;i++)
{
s=0;
for(j=1;j<=m;j++)
s+=v[i][j];
if(s<0) for(j=1;j<=m;j++)
v[i][j]=-1*v[i][j];
}
for(j=1;j<=m;j++)
{
s=0;
for(i=1;i<=n;i++)
s+=v[i][j];
if(s<0) for(i=1;i<=n;i++)
v[i][j]=-1*v[i][j];
}
s=0;
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
s+=v[i][j];
printf("%d", s);
}