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Cod sursa(job #996496)
#include <iostream>
#include <fstream>
#include <map>
using namespace std;
map<long,long> H;
int main() {
ifstream I("oite.in");
ofstream O("oite.out");
long C,L, A[1024];
I >> C >> L;
int i,j,k,l;
for(i=0;i<C;i++)
I >> A[i];
for(i=0;i<C;i++) {
for(j=i+1;j<C;j++) {
for(k=j+1;k<C;k++) {
for(l=k+1;l<C;l++) {
H[A[i]+A[j]+A[k]+A[l]]++;
};
};
};
};
O << H[L];
};