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Cod sursa(job #130868)
#include <iostream>
#include <fstream>
using namespace std;
int main()
{ int a[70][50], m, n, s=0,j ,i;
ifstream f("flip.in");
f>>n>>m;
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
f>>a[i][j];
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
if (a[i][j]<0) a[i][j]=a[i][j]*(-1);}
s=s+a[i][j];
f.close();
ofstream g("flip.out");
g<<s;
g.close();
return 0;
}