oj.uz

Submission #736204

# Submission time Handle Problem Language Result Execution time Memory
736204 2023-05-05T10:08:49 Z ksu2009en Event Hopping (BOI22_events) C++17
10 / 100
 1500 ms 13348 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;
    vector<ll>dp(a.size() + 1);


    while(q--){
        cin >> l >> r;
        //l = 1 + rand() % n, r = 1 + rand() % n;
        
        l--, r--;
        
        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

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Execution timed out 1582 ms 11592 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 8 ms 5116 KB Output is correct
4 Correct 6 ms 5076 KB Output is correct
5 Correct 8 ms 5108 KB Output is correct
6 Correct 8 ms 5076 KB Output is correct
7 Correct 13 ms 5156 KB Output is correct
8 Correct 10 ms 5076 KB Output is correct
9 Correct 10 ms 5080 KB Output is correct

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 8 ms 5116 KB Output is correct
4 Correct 6 ms 5076 KB Output is correct
5 Correct 8 ms 5108 KB Output is correct
6 Correct 8 ms 5076 KB Output is correct
7 Correct 13 ms 5156 KB Output is correct
8 Correct 10 ms 5076 KB Output is correct
9 Correct 10 ms 5080 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 5108 KB Output is correct
13 Correct 5 ms 5076 KB Output is correct
14 Correct 6 ms 5076 KB Output is correct
15 Correct 9 ms 5092 KB Output is correct
16 Correct 12 ms 5156 KB Output is correct
17 Correct 9 ms 5164 KB Output is correct
18 Correct 10 ms 5080 KB Output is correct
19 Execution timed out 1591 ms 5456 KB Time limit exceeded
20 Halted 0 ms 0 KB -

Subtask #4
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 8 ms 5116 KB Output is correct
4 Correct 6 ms 5076 KB Output is correct
5 Correct 8 ms 5108 KB Output is correct
6 Correct 8 ms 5076 KB Output is correct
7 Correct 13 ms 5156 KB Output is correct
8 Correct 10 ms 5076 KB Output is correct
9 Correct 10 ms 5080 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 5104 KB Output is correct
13 Correct 6 ms 5076 KB Output is correct
14 Correct 6 ms 5112 KB Output is correct
15 Correct 9 ms 5076 KB Output is correct
16 Correct 12 ms 5076 KB Output is correct
17 Correct 8 ms 5160 KB Output is correct
18 Correct 10 ms 5076 KB Output is correct
19 Correct 487 ms 11596 KB Output is correct
20 Correct 341 ms 11556 KB Output is correct
21 Correct 784 ms 11592 KB Output is correct
22 Incorrect 298 ms 13348 KB Output isn't correct
23 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1594 ms 11592 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #6
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Execution timed out 1582 ms 11592 KB Time limit exceeded
3 Halted 0 ms 0 KB -