[Codeforces Round #164 (Div. 2)]A. Games
地址:http://codeforces.com/contest/268/problem/A
枚举的同时计数...
1 #include <iostream> 2 #include <algorithm> 3 using namespace std; 4 5 int n,h[30],a[30]; 6 7 int main() 8 { 9 ios::sync_with_stdio(false); 10 int con=0; 11 cin>>n; 12 for(int i=0;i<n;i++) 13 { 14 cin>>h[i]>>a[i]; 15 } 16 for(int i=0;i<n;i++) 17 { 18 for(int j=0;j<n;j++) 19 { 20 if(i==j) continue; 21 if(h[i]==a[j]) con++; 22 } 23 } 24 cout<<con; 25 return 0; 26 }