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>
#define int long long
using namespace std;
int n,a,b;
vector<pair<int,int>> eves;
signed main()
{
ios::sync_with_stdio(false);
cin.tie(0);
cin>>n>>a>>b;
int div = a * b;
bool done = false;
for(int i=1;i<=n;i++)
{
int l,r;
cin>>l>>r;
if(r - l + 1 >= div)
{
done = true;
}
l %= div;
r %= div;
if(l <= r)
{
eves.push_back({l,1});
eves.push_back({r+1,-1});
}
else
{
eves.push_back({0,1});
eves.push_back({r+1,-1});
eves.push_back({l,1});
eves.push_back({div,-1});
}
}
if(done)
{
cout<<div<<'\n';
return 0;
}
sort(eves.begin(),eves.end());
int nr = 0;
int rez = 0;
int last = 0;
for(auto it : eves)
{
if(nr==0 && it.second==1)
{
last = it.first;
}
nr += it.second;
if(nr==0 && it.second==-1)
{
rez += it.first - last;
}
}
cout<<rez<<'\n';
return 0;
}
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