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Cod sursa(job #335229)
#include<fstream.h>
int a[16][16],i,n,smax,m;
int main()
{
long i,j,k,s,t;
ifstream f("flip.in");
ofstream g("flip.out");
f>>n>>m;
for(i=0;i<n;i++)
for(j=0;j<m;j++)
f>>a[i][j];
for(i=0;i<(1<<m);i++)
{
s=0;
for(k=0;k<n;k++)
{
for(t=j=0;j<m;j++)
if(i&(1<<j))
t+=-a[k][j];
else
t+=a[k][j];
if(t>-t)
s+=t;
else
s+=-t;
}
if(s>smax)
smax=s;
}
g<<smax;
return 0;
}