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;
using ll = long long;
int main() {
ios_base::sync_with_stdio(false);
cin.tie(0);
int n;
cin >> n;
vector<pair<int,int>> v(n);
for(int i = 0; i < n; i++) {
cin >> v[i].first >> v[i].second;
}
int j = 0;
queue<int> s;
int ans = 0;
for(int i = 0; i < n; i++) {
j = max(j, i);
while(j < n && (s.empty() || v[j].second >= v[s.front()].first)) {
while(!s.empty() && v[s.front()].first <= v[j].first) s.pop();
s.push(j);
j++;
}
ans = max(ans, j - i);
if(!s.empty() && s.front() == i) s.pop();
}
cout << ans;
return 0;
}
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