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Cod sursa(job #129357)
#include<stdio.h>
int main () {
int n,m,i,j,a[16][16],s;
freopen ("flip.in","r",stdin);
freopen ("flip.out","w",stdout);
scanf ("%d",&n);
scanf ("%d",&m);
for (i=0 ; i<=n ; i++)
{ for (j=0 ; j<=m ; j++)
scanf ("%d",&a[i][j]);
}
for (i=0 ; i<=n ; i++)
{ for (j=0 ; j<=m ; j++)
if (a[i][j]<0)
a[i][j]=a[i][j]*(-1);
}
s=0;
for (i=0 ; i<=n ; i++)
{ for (j=0 ; j<=m ; j++)
s=s+a[i][j];
}
printf ("%d",s);
return 0;
}