oj.uz

답안 #736174

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
736174 2023-05-05T09:41:21 Z ksu2009en Event Hopping (BOI22_events) C++14
10 / 100
 1500 ms 118972 KB 
#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];
    }
}

ll dp[2 * 5007][2 * 5007];
vector<ll>start_here[2 * 5007];

vector<one>a;

void count_dp(one fin){
    for(int i = 0; i < a.size(); i++)
        dp[i][fin.ind] = 1e9;
    
    dp[fin.ind][fin.ind] = 0;
    
    bool ok = false;
    
    multiset<ll>st;
    
    for(int ind = a.size() - 1; ind >= 0; ind--){
        auto i = a[ind];
        
        if(i.ind == fin.ind){
            //cout << i.ind << ' ' << ind << endl;
            ok = true;
            st.insert(0);
        }
        else if(ok){
            if(st.empty()){
               // cout << "st.empty() " << i.ind << endl;
                dp[i.ind][fin.ind] = 1e9;
                st.insert(1e9);
            }
            else{
              //  cout << i.ind << endl;
              //  for(auto j: st)
              //      cout << j << ' ';
              //  cout << endl;
                dp[i.ind][fin.ind] = *st.begin();
                if(*st.begin() != (ll)(1e9))
                    dp[i.ind][fin.ind]++;
                                
                st.insert(dp[i.ind][fin.ind]);
            }
        }
        else{
           // cout << "not yet " << i.ind << endl;
            st.insert(1e9);
        }
        
        if(ind - 1 >= 0){
            for(int del = i.second; del > a[ind - 1].second; del--)
                for(auto j: start_here[del]){
                    st.erase(st.find(dp[j][fin.ind]));
                }
        }
    }
}

vector<ll>count_dp2(ll start){
    vector<ll>dp2(a.size(), 1e9);
    
    dp2[start] = 0;
    
    for(auto i: a){
        for(auto j: a){
            if(i.first <= j.second && j.second <= i.second){
                dp2[i.ind] = min(dp2[i.ind], dp2[j.ind] + 1);
            }
        }
    }
    
    return dp2;
}
#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);
    
    for(auto i: a){
        count_dp(i);
    }
   
    while(q--){
        ll l, r;
        cin >> l >> r;
        //l = 1 + rand() % n, r = 1 + rand() % n;
        
        l--, r--;
        
        //auto dp2 = count_dp2(l);
        
        if(dp[l][r] == (ll)(1e9))
            cout << "impossible" << endl;
        else{
            cout << dp[l][r] << 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
 
 */
/*
 10 100
 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 'void count_dp(one)':
events.cpp:59:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<one>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   59 |     for(int i = 0; i < a.size(); i++)
      |                    ~~^~~~~~~~~~

Subtask #1
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 468 KB Output is correct
2 Runtime error 250 ms 99620 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 468 KB Output is correct
2 Correct 1 ms 596 KB Output is correct
3 Correct 53 ms 8588 KB Output is correct
4 Correct 50 ms 8532 KB Output is correct
5 Correct 66 ms 8556 KB Output is correct
6 Correct 126 ms 8784 KB Output is correct
7 Correct 160 ms 8664 KB Output is correct
8 Correct 103 ms 8648 KB Output is correct
9 Correct 92 ms 8488 KB Output is correct

Subtask #3
0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 468 KB Output is correct
2 Correct 1 ms 596 KB Output is correct
3 Correct 53 ms 8588 KB Output is correct
4 Correct 50 ms 8532 KB Output is correct
5 Correct 66 ms 8556 KB Output is correct
6 Correct 126 ms 8784 KB Output is correct
7 Correct 160 ms 8664 KB Output is correct
8 Correct 103 ms 8648 KB Output is correct
9 Correct 92 ms 8488 KB Output is correct
10 Correct 1 ms 468 KB Output is correct
11 Correct 1 ms 468 KB Output is correct
12 Correct 46 ms 8636 KB Output is correct
13 Correct 52 ms 8532 KB Output is correct
14 Correct 57 ms 8532 KB Output is correct
15 Correct 126 ms 8604 KB Output is correct
16 Correct 147 ms 8664 KB Output is correct
17 Correct 98 ms 8660 KB Output is correct
18 Correct 95 ms 8544 KB Output is correct
19 Execution timed out 1597 ms 118972 KB Time limit exceeded
20 Halted 0 ms 0 KB -

Subtask #4
0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 468 KB Output is correct
2 Correct 1 ms 596 KB Output is correct
3 Correct 53 ms 8588 KB Output is correct
4 Correct 50 ms 8532 KB Output is correct
5 Correct 66 ms 8556 KB Output is correct
6 Correct 126 ms 8784 KB Output is correct
7 Correct 160 ms 8664 KB Output is correct
8 Correct 103 ms 8648 KB Output is correct
9 Correct 92 ms 8488 KB Output is correct
10 Correct 1 ms 468 KB Output is correct
11 Correct 1 ms 596 KB Output is correct
12 Correct 46 ms 8576 KB Output is correct
13 Correct 45 ms 8532 KB Output is correct
14 Correct 57 ms 8624 KB Output is correct
15 Correct 127 ms 8500 KB Output is correct
16 Correct 151 ms 8660 KB Output is correct
17 Correct 101 ms 8652 KB Output is correct
18 Correct 91 ms 8588 KB Output is correct
19 Runtime error 227 ms 99664 KB Execution killed with signal 11
20 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 243 ms 99640 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #6
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 468 KB Output is correct
2 Runtime error 250 ms 99620 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -