Cod sursa(job #257927)
Utilizator | Cojocaru Valentin enjoyz | Data | 14 februarie 2009 13:00:37 |
---|---|---|---|
Problema | Medie | Scor | 50 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.47 kb |
#include<stdio.h>
int v[9001];
int main()
{int x,n,i,S=0,nr,k,j;
FILE *f=fopen("medie.in","r");
FILE *g=fopen("medie.out","w");
fscanf(f,"%d",&n);
for(i=1;i<=n;i++) {fscanf(f,"%d",&x);
v[x]++;}
for(i=1;i<=7001;i++)
{nr=v[i];
S=S+(nr*(nr-1)*(nr-2)/2);
j=i-1;
k=i+1;
while(j>=1 && k<=n) {if(v[j]!=0 && v[k]!=0) S=S+v[i]*v[j]*v[k];
j--;
k++;}
}
fprintf(g,"%d",S);
fclose(f);
fclose(g);
return 0;
}