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;
#define ll long long
#define pb push_back
#define ff first
#define ss second
#define all(s) s.begin(),s.end()
#define rall(s) s.rbegin(),s.rend()
int main(){
ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
ll n,a,b;
cin>>n>>a>>b;
ll l[n+5],r[n+5];
ll g=a/gcd((b+1)%a,a),MX=1e18+1;
if(MX/b<=g){
g=g*b;
}
else{
g=MX;
}
for(ll i=1;i<=n;i++){
cin>>l[i]>>r[i];
}
if(n==1){
cout<<min(r[1]-l[1]+1,g);
}
}
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