제출 #119633

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
119633		popovicirobert	무제 (POI11_tem)	C++14	100 / 100	253 ms	29968 KiB

Main

#include <bits/stdc++.h>
#define lsb(x) (x & (-x))
#define ll long long
#define ull unsigned long long
// 217
// 44

/*
const int MOD = ;

inline void mod(int &x) {
    if(x >= MOD)
        x -= MOD;
}

inline void add(int &x, int y) {
    x += y;
    mod(x);
}

inline void mul(int &x, int y) {
    x = (1LL * x * y) % MOD;
}
*/

using namespace std;

const int MAXN = (int) 1e6;

int l[MAXN + 1], r[MAXN + 1];
int deq[MAXN + 1];


int main() {
    //ifstream cin("B.in");
    //ofstream cout("B.out");
    int i, n;
    ios::sync_with_stdio(false);
    cin.tie(0), cout.tie(0);

    cin >> n;

    for(i = 1; i <= n; i++) {
        cin >> l[i] >> r[i];
    }

    int pos = 1, ans = 0;
    int be = 0, en = -1;

    for(i = 1; i <= n; i++) {
        while(pos <= n && (be > en || l[deq[be]] <= r[pos])) {
            while(en >= be && l[deq[en]] <= l[pos]) {
                en--;
            }
            deq[++en] = pos++;
        }

        ans = max(ans, pos - i);

        if(deq[be] == i) {
            be++;
        }
    }

    cout << ans;

    //cin.close();
    //cout.close();
    return 0;
}

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