oj.uz

답안 #722372

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
722372 2023-04-11T20:55:48 Z Itamar Event Hopping (BOI22_events) C++14
20 / 100
 367 ms 26068 KB 
// rebel.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include <iostream>
using namespace std;
#include <vector>
#include <set>
#define pi pair<int,int>
#define vi vector<int>
#include <queue>
#include <algorithm>
#define ll long long

const int siz = 1e5;
int lii[siz];
int rii[siz];
int bin[siz][20];
int in[siz];
struct node {
    int l, r, mid;
    pi maxi;
    node* sl, * sr;
    node(int li, int ri) {
        l = li, r = ri, mid = (l + r) / 2;
        if (l < r) {
            sl = new node(l, mid);
            sr = new node(mid + 1, r);
            maxi = max(sl->maxi, sr->maxi);
        }
        else {
            maxi = { rii[l],l };
        }
    }
    pi query(int a, int b) {
        if (a > r || b < l)return { 0,0 };
        if (l >= a && r <= b)return maxi;
        return max(sl->query(a, b), sr->query(a, b));
    }
};
int main()
{
    int n, q;
    cin >> n >> q;
    vector<vi> vec;
    vi v1, v2;
    for (int i = 0; i < n; i++) {
        int s, e;
        cin >> s >> e;
        vec.push_back({ e,-s,i });//

    }
    sort(vec.begin(), vec.end());
    for (vi p : vec) {
        v1.push_back(p[0]); v2.push_back(-p[1]);
    }
    for (int i = 0; i < n; i++) {
        lii[i] = lower_bound(v1.begin(), v1.end(), v2[i]) - v1.begin();
        in[vec[i][2]] = i;
    }
    for (int i = 0; i < n; i++) {
        rii[n - 1 - i] = n - 1 - (lii[i]);
        in[i] = n - 1 - in[i];
    }
    node* seg = new node(0, n - 1);
    for (int i = 0; i < n; i++) {
        bin[i][0] = seg->query(i, rii[i]).second;
    }
    for (int i = 1; i < 20; i++) {
        for (int v = 0; v < n; v++) {
            bin[v][i] = bin[bin[v][i - 1]][i - 1];
        }
    }
    for (int i = 0; i < q; i++) {
        int a, b;
        cin >> a >> b;
        swap(a, b);
        a--, b--;
        a = in[a], b = in[b];
        if (a == b)cout << 0 << "\n";
        else if (a > b)cout << "impossible" << "\n";
        else if (rii[a] >= b) cout << 1 << "\n";
        else {
            int ans = 0;
            for (int i = 19; i >= 0; i--) {
                if (rii[bin[a][i]] < b) {
                    a = bin[a][i];
                    ans += 1 << i;
                }
            }

        if (rii[bin[a][0]] >= b)cout << ans + 2 << "\n";
        else cout << "impossible" << "\n";
        }
    }
}

Subtask #1
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 1 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 212 KB Output is correct
2 Incorrect 1 ms 212 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 212 KB Output is correct
2 Incorrect 1 ms 212 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 212 KB Output is correct
2 Incorrect 1 ms 212 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #5
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 367 ms 25616 KB Output is correct
2 Correct 320 ms 25592 KB Output is correct
3 Correct 365 ms 25604 KB Output is correct
4 Correct 306 ms 26068 KB Output is correct
5 Correct 340 ms 25972 KB Output is correct
6 Correct 340 ms 25820 KB Output is correct
7 Correct 332 ms 25788 KB Output is correct
8 Correct 341 ms 25928 KB Output is correct
9 Correct 127 ms 25016 KB Output is correct
10 Correct 347 ms 25420 KB Output is correct
11 Correct 312 ms 25280 KB Output is correct
12 Correct 316 ms 25476 KB Output is correct

Subtask #6
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 1 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -