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Cod sursa(job #87144)
#include<fstream.h>
int g,w,e[100],c[100],min=10000;
void energ(int en,int cost,int p)
{int i;
if(en<w)
{if(p==g+1) min=-1;
for(i=p;i<=g && cost<min;i++)
energ(en+e[i],cost+c[i],i+1); }
else if(cost<min) min=cost;
}
int main()
{ifstream f("energii.in");
ofstream h("energii.out");
int i;
f>>g>>w;
for(i=1;i<=g;i++)
f>>e[i]>>c[i];
energ(0,0,1);
h<<min<<'\n';
f.close(); h.close();
return 0;
}