oj.uz

Submission #736197

# Submission time Handle Problem Language Result Execution time Memory
736197 2023-05-05T09:59:46 Z ksu2009en Event Hopping (BOI22_events) C++14
10 / 100
 1500 ms 55632 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 * 1000007];

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(n + 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 = true;
        
        multiset<ll>st;
        
        for(int ind = a.size(); 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();
                    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
 
 */
/*
 10 100
 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 '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 28 ms 47164 KB Output is correct
2 Execution timed out 1578 ms 53832 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 24 ms 47188 KB Output is correct
2 Correct 26 ms 47244 KB Output is correct
3 Correct 31 ms 47360 KB Output is correct
4 Correct 29 ms 47320 KB Output is correct
5 Correct 27 ms 47288 KB Output is correct
6 Correct 30 ms 47336 KB Output is correct
7 Correct 35 ms 47316 KB Output is correct
8 Correct 31 ms 47344 KB Output is correct
9 Correct 31 ms 47252 KB Output is correct

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 24 ms 47188 KB Output is correct
2 Correct 26 ms 47244 KB Output is correct
3 Correct 31 ms 47360 KB Output is correct
4 Correct 29 ms 47320 KB Output is correct
5 Correct 27 ms 47288 KB Output is correct
6 Correct 30 ms 47336 KB Output is correct
7 Correct 35 ms 47316 KB Output is correct
8 Correct 31 ms 47344 KB Output is correct
9 Correct 31 ms 47252 KB Output is correct
10 Correct 25 ms 47228 KB Output is correct
11 Correct 24 ms 47212 KB Output is correct
12 Correct 31 ms 47372 KB Output is correct
13 Correct 27 ms 47312 KB Output is correct
14 Correct 31 ms 47360 KB Output is correct
15 Correct 33 ms 47316 KB Output is correct
16 Correct 34 ms 47388 KB Output is correct
17 Correct 36 ms 47328 KB Output is correct
18 Correct 32 ms 47328 KB Output is correct
19 Execution timed out 1587 ms 47820 KB Time limit exceeded
20 Halted 0 ms 0 KB -

Subtask #4
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 24 ms 47188 KB Output is correct
2 Correct 26 ms 47244 KB Output is correct
3 Correct 31 ms 47360 KB Output is correct
4 Correct 29 ms 47320 KB Output is correct
5 Correct 27 ms 47288 KB Output is correct
6 Correct 30 ms 47336 KB Output is correct
7 Correct 35 ms 47316 KB Output is correct
8 Correct 31 ms 47344 KB Output is correct
9 Correct 31 ms 47252 KB Output is correct
10 Correct 24 ms 47168 KB Output is correct
11 Correct 24 ms 47176 KB Output is correct
12 Correct 30 ms 47364 KB Output is correct
13 Correct 27 ms 47356 KB Output is correct
14 Correct 29 ms 47260 KB Output is correct
15 Correct 35 ms 47336 KB Output is correct
16 Correct 34 ms 47316 KB Output is correct
17 Correct 29 ms 47380 KB Output is correct
18 Correct 31 ms 47316 KB Output is correct
19 Correct 486 ms 53932 KB Output is correct
20 Correct 367 ms 53840 KB Output is correct
21 Correct 823 ms 53824 KB Output is correct
22 Incorrect 324 ms 55632 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 1569 ms 53880 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #6
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 28 ms 47164 KB Output is correct
2 Execution timed out 1578 ms 53832 KB Time limit exceeded
3 Halted 0 ms 0 KB -