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#include <iostream>
#include <fstream>
int i,m,n,j;
long nr,v[17][17];
using namespace std;
void shiftl(int i){
for(j=1;j<=m;j++){
v[i][j]=-v[i][j];
}
}
void shiftc(int j){
for(i=1;i<=n;i++){
v[i][j]=-v[i][j];
}
}
int main()
{
ifstream f("flip.in");
ofstream g("flip.out");
f>>n>>m;
for(i=1;i<=n;i++){
for(j=1;j<=m;j++){
f>>v[i][j];
}
}
f.close();
for(i=1;i<=n;i++){nr=0;
for(j=1;j<=m;j++){
nr=nr+v[i][j];
}
if(nr<0){shiftl(i);cout<<"linie comutata: "<<i<<endl;}
}
for(i=1;i<=n;i++){nr=0;
for(j=1;j<=m;j++){
nr=nr+v[j][i];
}
if(nr<0){shiftc(i);cout<<"col comutata: "<<i<<endl;}
}
nr=0;
for(i=1;i<=n;i++){
for(j=1;j<=m;j++){
nr=v[i][j]+nr;
}
}
cout<<nr;
g.close();
return 0;
}