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Cod sursa(job #979973)
#include<fstream>
using namespace std;
int main()
{int n,m,i,s,j;long long a[18][18];
ifstream f("flip.in");
f>>n>>m;
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)f>>a[i][j];
f.close();
for(i=1;i<=n;i++)
{s=0;
for(j=1;j<=m;j++)s+=a[i][j];
if(s<0)for(j=1;j<=m;j++)a[i][j]*=-1;}
for(j=1;j<=m;j++)
{s=0;
for(i=1;i<=n;i++)s+=a[i][j];
if(s<0)for(i=1;i<=n;i++)a[i][j]*=-1;}
s=0;
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)s+=a[i][j];
ofstream g("flip.out");
g<<s;g.close();}