2017 ACM/ICPC Asia Regional Shenyang Online cable cable cable

Problem Description

Connecting the display screen and signal sources which produce different color signals by cables, then the display screen can show the color of the signal source.Notice that every signal source can only send signals to one display screen each time. 
Now you have K different colors.

Input

Multiple cases (no more than K.

Output

Output the minimum number of cables N.

Sample Input

3 2

20 15

 

Sample Output

4

90

没什么要说的

 1 #include <bits/stdc++.h>
 2 using namespace std;
 3 int main(){
 4     long long n,m;
 5     while(cin>>n>>m){
 6         if(n<=m){
 7             cout<<n<<endl;
 8         }else{
 9             cout<<(n-m+1)*m<<endl;
10         }
11     }
12     return 0;
13 }