Bình luận

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  petercon123  đã bình luận lúc 4, Tháng 10, 2026, 14:12

  include <bits/stdc++.h>

  using namespace std;
  #define ll long long
  const ll N=1e6+1;
  ll n,a,b,x,y;
  
  int main(){
  cin>>a>>b>>x>>y;
  
  ll bc=a/__gcd(a,b)*b;
      ll kq1=y/a-(x-1)/a;
      ll kq2=y/bc-(x-1)/bc;
  cout<&lt;kq1-kq2;
  return 0;
  }