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Cod sursa(job #830799)
#include<fstream>
using namespace std;
int n,m,maxim,x[17][17],v[17],i,j,s1,s2;
ofstream g("flip.out");
void verif()
{
for(i=1;i<=m;i++)
{
s1=0;
for(j=1;j<=n;j++)
{
s1+=x[i][j]*v[j+1];
}
if(s1<0) s2+=s1*-1;
else
s2+=s1;
}
if(s2>maxim)
maxim=s2;
}
void back(int k)
{
if(k>m)
{
verif();
}
else
{
for(i=-1;i<=1;i+=2)
{
v[k] = i;
back(k+1);
}
}
}
int main()
{
ifstream f("flip.in");
f>>n>>m;
for(i=1;i<=m;i++)
for(j=1;j<=n;j++)
f>>x[i][j];
back(1);
g<<maxim;
return 0;
}