oj.uz

Submission #736195

# Submission time Handle Problem Language Result Execution time Memory
736195 2023-05-05T09:58:50 Z ksu2009en Event Hopping (BOI22_events) C++14
10 / 100
 1500 ms 57520 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 24 ms 47216 KB Output is correct
2 Execution timed out 1575 ms 53840 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 25 ms 47188 KB Output is correct
2 Correct 24 ms 47176 KB Output is correct
3 Correct 29 ms 47356 KB Output is correct
4 Correct 28 ms 47328 KB Output is correct
5 Correct 29 ms 47260 KB Output is correct
6 Correct 30 ms 47324 KB Output is correct
7 Correct 47 ms 47396 KB Output is correct
8 Correct 30 ms 47316 KB Output is correct
9 Correct 31 ms 47316 KB Output is correct

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 25 ms 47188 KB Output is correct
2 Correct 24 ms 47176 KB Output is correct
3 Correct 29 ms 47356 KB Output is correct
4 Correct 28 ms 47328 KB Output is correct
5 Correct 29 ms 47260 KB Output is correct
6 Correct 30 ms 47324 KB Output is correct
7 Correct 47 ms 47396 KB Output is correct
8 Correct 30 ms 47316 KB Output is correct
9 Correct 31 ms 47316 KB Output is correct
10 Correct 26 ms 47288 KB Output is correct
11 Correct 25 ms 47264 KB Output is correct
12 Correct 30 ms 47316 KB Output is correct
13 Correct 26 ms 47340 KB Output is correct
14 Correct 28 ms 47376 KB Output is correct
15 Correct 32 ms 47244 KB Output is correct
16 Correct 33 ms 47424 KB Output is correct
17 Correct 34 ms 47308 KB Output is correct
18 Correct 31 ms 47280 KB Output is correct
19 Execution timed out 1580 ms 47708 KB Time limit exceeded
20 Halted 0 ms 0 KB -

Subtask #4
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 25 ms 47188 KB Output is correct
2 Correct 24 ms 47176 KB Output is correct
3 Correct 29 ms 47356 KB Output is correct
4 Correct 28 ms 47328 KB Output is correct
5 Correct 29 ms 47260 KB Output is correct
6 Correct 30 ms 47324 KB Output is correct
7 Correct 47 ms 47396 KB Output is correct
8 Correct 30 ms 47316 KB Output is correct
9 Correct 31 ms 47316 KB Output is correct
10 Correct 27 ms 47188 KB Output is correct
11 Correct 26 ms 47280 KB Output is correct
12 Correct 32 ms 47380 KB Output is correct
13 Correct 29 ms 47316 KB Output is correct
14 Correct 27 ms 47312 KB Output is correct
15 Correct 31 ms 47312 KB Output is correct
16 Correct 34 ms 47308 KB Output is correct
17 Correct 31 ms 47300 KB Output is correct
18 Correct 34 ms 47352 KB Output is correct
19 Correct 505 ms 53928 KB Output is correct
20 Correct 357 ms 55088 KB Output is correct
21 Correct 832 ms 55724 KB Output is correct
22 Incorrect 335 ms 57520 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 1586 ms 53836 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #6
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 24 ms 47216 KB Output is correct
2 Execution timed out 1575 ms 53840 KB Time limit exceeded
3 Halted 0 ms 0 KB -