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;
typedef unsigned long long ull;
#define fi first
#define se second
#define pb push_back
#define TC int t; cin>>t; while(t--)
#define all(x) (x).begin(),(x).end()
//*AC BERSAMA ALLAH FORTIS FORTUNA ADIUVAT
//# nyampah
int main() {
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
ll n,a,b;
cin>>n>>a>>b;
set<pair<ll,ll> > sp;
for(int i=0;i<n;i++){
ll l,r; cin>>l>>r;
for(int j=l;j<=r;j++){
sp.insert(make_pair((j+j/b)%a,(j%b)));
}
}
cout<<sp.size();
return 0;
}
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