Cod sursa(job #643414)
Utilizator | Data | 3 decembrie 2011 17:45:08 | |
---|---|---|---|
Problema | Medie | Scor | 60 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.42 kb |
#include <cstdio>
int f[7005],fr[7005],r;
int main () {
freopen("medie.in","r",stdin);
freopen("medie.out","w",stdout);
int i,j,n,a;
scanf("%d",&n);
for(i=1;i<=n;++i){
scanf("%d",&f[i]);
}
for(i=1;i<=n;++i){
fr[f[i]]++;
}
for(i=2;i<=n;++i){
for(j=1;j<=n;++j){
if(i>j&&(f[i]+f[j])%2==0){
a=(f[i]+f[j])/2;
r=r+fr[a];
if(f[i]==f[j]){
r=r-2;
}
}
}
}
printf("%d",r);
return 0;
}