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  1. #include <bits/stdc++.h>
  2. using ll = long long;
  3. using namespace std;
  4.  
  5. ll gcd(ll a, ll b){
  6.   if(b == 0) return a;
  7.   return gcd(b, a%b);
  8. }
  9.  
  10. ll lcm(ll a, ll b){
  11.   return (a*b) / gcd(a, b);
  12. }
  13.  
  14. int main() {
  15.  
  16.     int t;
  17.     cin >> t;
  18.     while(t--){
  19.       ll n, x, y;
  20.       cin >> n >> x >> y;
  21.       ll sum = 0;
  22.       int so1 = n/x - n/lcm(x, y);
  23.       int so2 = n/y - n/lcm(x, y);
  24.       ll tongdau = n*(n+1)/2;
  25.       sum += tongdau - (n-so1)*(n-so1+1)/2;
  26.       sum -= (so2)*(so2+1)/2;
  27.       cout << sum;
  28.       cout << endl;
  29. }
  30. }
  31.  
Success #stdin #stdout 0.05s 5300KB
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https://ideone.com/EdQUEO
language:
C++14 (gcc 8.3)
created:
9 days ago
visibility:
public

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