oj.uz

Submission #736184

# Submission time Handle Problem Language Result Execution time Memory
736184 2023-05-05T09:51:37 Z ksu2009en Event Hopping (BOI22_events) C++14
10 / 100
 1500 ms 118924 KB 
#pragma GCC optimize("O3,unroll-loops")
#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];
    }
}

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

vector<one>a;

void count_dp(one &fin, ll &pos){
    for(int i = 0; i < a.size(); i++)
        dp[i][fin.ind] = 1e9;
    
    dp[fin.ind][fin.ind] = 0;
    
    bool ok = true;
    
    multiset<ll>st;
    
    for(int ind = pos; ind >= 0; ind--){
        auto i = a[ind];
        
        if(i.ind == fin.ind){
            ok = true;
            st.insert(0);
        }
        else if(ok){
            if(st.empty()){
                dp[i.ind][fin.ind] = 1e9;
            }
            else{
                dp[i.ind][fin.ind] = *st.begin();
                dp[i.ind][fin.ind]++;
                                
                st.insert(dp[i.ind][fin.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][fin.ind]) != st.end())
                        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);
    
    ll ind = 0;
    for(auto i: a){
        count_dp(i, ind);
        ind++;
    }
    ll l, r;

    while(q--){
        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&, ll&)':
events.cpp:62:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<one>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   62 |     for(int i = 0; i < a.size(); i++)
      |                    ~~^~~~~~~~~~

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 468 KB Output is correct
2 Runtime error 256 ms 99656 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 468 KB Output is correct
2 Correct 1 ms 468 KB Output is correct
3 Correct 45 ms 8624 KB Output is correct
4 Correct 25 ms 8532 KB Output is correct
5 Correct 49 ms 8628 KB Output is correct
6 Correct 49 ms 8612 KB Output is correct
7 Correct 91 ms 8672 KB Output is correct
8 Correct 51 ms 8660 KB Output is correct
9 Correct 46 ms 8564 KB Output is correct

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 468 KB Output is correct
2 Correct 1 ms 468 KB Output is correct
3 Correct 45 ms 8624 KB Output is correct
4 Correct 25 ms 8532 KB Output is correct
5 Correct 49 ms 8628 KB Output is correct
6 Correct 49 ms 8612 KB Output is correct
7 Correct 91 ms 8672 KB Output is correct
8 Correct 51 ms 8660 KB Output is correct
9 Correct 46 ms 8564 KB Output is correct
10 Correct 1 ms 468 KB Output is correct
11 Correct 1 ms 596 KB Output is correct
12 Correct 29 ms 8632 KB Output is correct
13 Correct 21 ms 8532 KB Output is correct
14 Correct 32 ms 8628 KB Output is correct
15 Correct 47 ms 8600 KB Output is correct
16 Correct 88 ms 8660 KB Output is correct
17 Correct 50 ms 8660 KB Output is correct
18 Correct 48 ms 8532 KB Output is correct
19 Execution timed out 1586 ms 118924 KB Time limit exceeded
20 Halted 0 ms 0 KB -

Subtask #4
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 468 KB Output is correct
2 Correct 1 ms 468 KB Output is correct
3 Correct 45 ms 8624 KB Output is correct
4 Correct 25 ms 8532 KB Output is correct
5 Correct 49 ms 8628 KB Output is correct
6 Correct 49 ms 8612 KB Output is correct
7 Correct 91 ms 8672 KB Output is correct
8 Correct 51 ms 8660 KB Output is correct
9 Correct 46 ms 8564 KB Output is correct
10 Correct 1 ms 468 KB Output is correct
11 Correct 1 ms 596 KB Output is correct
12 Correct 34 ms 8660 KB Output is correct
13 Correct 23 ms 8636 KB Output is correct
14 Correct 33 ms 8632 KB Output is correct
15 Correct 46 ms 8532 KB Output is correct
16 Correct 89 ms 8668 KB Output is correct
17 Correct 51 ms 8680 KB Output is correct
18 Correct 45 ms 8584 KB Output is correct
19 Runtime error 234 ms 99620 KB Execution killed with signal 11
20 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Runtime error 262 ms 99620 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #6
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 468 KB Output is correct
2 Runtime error 256 ms 99656 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -