oj.uz

답안 #736206

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
736206 2023-05-05T10:10:12 Z ksu2009en Event Hopping (BOI22_events) C++17
10 / 100
 1500 ms 13384 KB 
#pragma GCC optimize("O3")
#pragma GCC target("avx,avx2")

#include <iostream>
#include <vector>
#include <string>
#include <math.h>
#include <cmath>
#include <iomanip>
#include <cstdio>
#include <algorithm>
#include <numeric>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <deque>
#include <bitset>
#include <cstring>
#include <unordered_map>

using namespace std;
typedef int ll;

struct one{
    ll first, second, ind;
};

bool cmp(one &p1, one &p2){
    if(p1.second == p2.second)
        return p1.first < p2.first;
    return p1.second < p2.second;
}

void compress(vector<one> &a){
    vector<ll>b;
    for(auto i: a){
        b.push_back(i.first);
        b.push_back(i.second);
    }
    
    sort(b.begin(), b.end());
    b.resize(unique(b.begin(), b.end()) - b.begin());
    
    ll step = 1;
    map<ll, ll> mp;
    for(auto i: b)
        mp[i] = step++;
    
    for(auto &i: a){
        i.first = mp[i.first];
        i.second = mp[i.second];
    }
}

vector<ll>start_here[2 * 100007];

vector<one>a;

#define endl '\n'

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    
    ll n, q;
    cin >> n >> q;
    
    a.resize(n);
    for(int i = 0; i < n; i++){
        cin >> a[i].first >> a[i].second;
        a[i].ind = i;
    }
    
    compress(a);
    sort(a.begin(), a.end(), cmp);

    
    for(auto i: a)
        start_here[i.first].push_back(i.ind);
    
    ll l, r;


    while(q--){
        cin >> l >> r;
        //l = 1 + rand() % n, r = 1 + rand() % n;
        
        l--, r--;
        vector<ll>dp(a.size());

        for(int i = 0; i < a.size(); i++)
            dp[i] = 1e9;
        
        dp[r] = 0;
        
        bool ok = false;
        
        multiset<ll>st;
        
        for(int ind = a.size() - 1; ind >= 0; ind--){
            auto i = a[ind];
            
            if(i.ind == r){
                ok = true;
                st.insert(0);
            }
            else if(ok){
                if(st.empty()){
                    dp[i.ind] = 1e9;
                }
                else{
                    dp[i.ind] = *st.begin();
                    
                    if(dp[i.ind] != (ll)(1e9)){dp[i.ind]++;
                                    
                    st.insert(dp[i.ind]);
                    }
                }
            }
            
            if(ind - 1 >= 0){
                for(int del = i.second; del > a[ind - 1].second; del--)
                    for(auto j: start_here[del]){
                        if(st.find(dp[j]) != st.end())
                            st.erase(st.find(dp[j]));
                    }
            }
        }
        
        if(dp[l] == (ll)(1e9))
            cout << "impossible" << endl;
        else{
            cout << dp[l] << endl;
        }
    }
     
    return 0;
}
/*
 8 1
 1 2
 3 4
 1 5
 6 7
 5 10
 10 20
 15 20
 999999999 1000000000
 1 7
 
 
 */
/*
 1 2
 1 1000000000
 
 */
/*
 5 9
 2 0
 
 */
/*
 10 1
 1 3
 4 6
 2 8
 8 23
 1 4
 2 4
 6 73
 2 34
 1 9
 8 90
 
 2 3
 
 
 */

Compilation message

events.cpp: In function 'int main()':
events.cpp:93:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<one>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   93 |         for(int i = 0; i < a.size(); i++)
      |                        ~~^~~~~~~~~~

Subtask #1
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Execution timed out 1579 ms 11572 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 7 ms 5076 KB Output is correct
4 Correct 5 ms 5076 KB Output is correct
5 Correct 6 ms 5076 KB Output is correct
6 Correct 11 ms 5076 KB Output is correct
7 Correct 13 ms 5076 KB Output is correct
8 Correct 8 ms 5164 KB Output is correct
9 Correct 11 ms 5076 KB Output is correct

Subtask #3
0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 7 ms 5076 KB Output is correct
4 Correct 5 ms 5076 KB Output is correct
5 Correct 6 ms 5076 KB Output is correct
6 Correct 11 ms 5076 KB Output is correct
7 Correct 13 ms 5076 KB Output is correct
8 Correct 8 ms 5164 KB Output is correct
9 Correct 11 ms 5076 KB Output is correct
10 Correct 3 ms 4948 KB Output is correct
11 Correct 3 ms 4948 KB Output is correct
12 Correct 8 ms 5076 KB Output is correct
13 Correct 6 ms 5076 KB Output is correct
14 Correct 6 ms 5076 KB Output is correct
15 Correct 8 ms 5076 KB Output is correct
16 Correct 13 ms 5164 KB Output is correct
17 Correct 10 ms 5164 KB Output is correct
18 Correct 11 ms 5080 KB Output is correct
19 Execution timed out 1579 ms 5696 KB Time limit exceeded
20 Halted 0 ms 0 KB -

Subtask #4
0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 7 ms 5076 KB Output is correct
4 Correct 5 ms 5076 KB Output is correct
5 Correct 6 ms 5076 KB Output is correct
6 Correct 11 ms 5076 KB Output is correct
7 Correct 13 ms 5076 KB Output is correct
8 Correct 8 ms 5164 KB Output is correct
9 Correct 11 ms 5076 KB Output is correct
10 Correct 3 ms 4948 KB Output is correct
11 Correct 3 ms 4948 KB Output is correct
12 Correct 7 ms 5080 KB Output is correct
13 Correct 5 ms 5116 KB Output is correct
14 Correct 6 ms 5076 KB Output is correct
15 Correct 9 ms 5092 KB Output is correct
16 Correct 14 ms 5076 KB Output is correct
17 Correct 9 ms 5076 KB Output is correct
18 Correct 13 ms 5088 KB Output is correct
19 Correct 482 ms 11592 KB Output is correct
20 Correct 352 ms 11592 KB Output is correct
21 Correct 708 ms 11588 KB Output is correct
22 Incorrect 284 ms 13384 KB Output isn't correct
23 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1583 ms 11692 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #6
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Execution timed out 1579 ms 11572 KB Time limit exceeded
3 Halted 0 ms 0 KB -