Submission #863057

#	Time	Username	Problem	Language	Result	Execution time	Memory
863057		3omar_ahmed	Osumnjičeni (COCI21_osumnjiceni)	C++17	30 / 110	1098 ms	38912 KiB

Main

#include <bits/stdc++.h>
using namespace std ;
#define int long long
#define endl '\n'
#define all(a) a.begin() , a.end()
#define alr(a) a.rbegin() , a.rend()

signed main(){
    ios_base::sync_with_stdio(0); cin.tie(0);cout.tie(0);

    int n;
    cin >> n;
    n += 1;
    vector < pair < int , int >> a(n);
    for(int i = 0 ; i + 1 < n ; i++) {
        cin >> a[i].first >> a[i].second;
    }    
    a[n - 1] = {1, n};
    vector < vector < int >> nxt(20, vector < int > (n + 1, -1));
    nxt[0][n - 1] = n - 1;
    for(int i = n - 2 ; i >= 0 ; i--) {
        nxt[0][i] = nxt[0][i + 1];
        for(int j = i + 1 ; j < n ; j++) {
            int l = max(a[i].first, a[j].first);
            int r = min(a[i].second, a[j].second);
            if(l <= r) nxt[0][i] = min(nxt[0][i], j - 1);
        }
    }

    for(int i = 1 ; i < 20 ; i++) {
        for(int j = 0 ; j < n ; j++) {
            if(nxt[i - 1][j] != -1)
                nxt[i][j] = nxt[i - 1][nxt[i - 1][j] + 1];
        }
    }

    int q;
    cin >> q;
    while(q--) {
        int l, r;
        cin >> l >> r;
        l -= 1, r -= 1;
        int ans = 0;
        for(int i = 19 ; i >= 0 ; i--) {
            if(nxt[i][l] <= r && nxt[i][l] != -1) {
                ans += (1ll << i);
                l = nxt[i][l] + 1;
            }
        }
        ans += (l <= r);
        cout << ans << endl;
    }
    return 0 ;
}

• Subtask 1: 0 / 10
• Subtask 2: 10 / 10
• Subtask 3: 20 / 20
• Subtask 4: 0 / 20
• Subtask 5: 0 / 50