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  1. #include<bits/stdc++.h>
  2. #define all(x) x.begin(), x.end()
  3. #define pb(x) push_back(x)
  4. #define MAXN 100005
  5. #define cout2(x, y) cout << x << " " << y << endl;
  6.  
  7. #define MOD 1000000007
  8. using namespace std;
  9.  
  10. int main(){
  11.  
  12.     long long a, b;
  13.     while(cin>>a>>b){
  14.  
  15.  
  16.         long long ans = 0, aux;
  17.  
  18.         for(int r = 1; r < b; r++){
  19.  
  20.             aux = (a * (a + 1)/2)%MOD;
  21.             aux = (aux * b)%MOD;
  22.  
  23.             aux = ((aux + a )* r)%MOD;
  24.             ans = (ans + aux)%MOD; 
  25.  
  26.         }
  27.  
  28.         cout << ans << endl;    
  29.     }
  30.  
  31. }
Success #stdin #stdout 0s 3300KB
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https://ideone.com/HNIyaa
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

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