이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
//#include<bits/extc++.h>
//__gnu_pbds
// observation
// every thing is the same, actually
// it will probably be A/gcd(A,b+1)*B stuff,so basically lcm(A,B)
int main(){
int n;
ll A,B;
cin>>n>>A>>B;
set<pair<ll,ll> > s;
for(int i=0;i<n;i++){
ll l,r;cin>>l>>r;
for(int j=l;j<=r;j++){
s.insert({(j+j/B)%A,j%B});
}
}
cout<<s.size()<<'\n';
return 0;
}
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