oj.uz

Submission #736187

# Submission time Handle Problem Language Result Execution time Memory
736187 2023-05-05T09:53:01 Z ksu2009en Event Hopping (BOI22_events) C++17
10 / 100
 1500 ms 118972 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){
    
}

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 pos = 0;
    for(auto fin: a){
        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]));
                    }
            }
        }
        pos++;
    }
    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 'int main()':
events.cpp:105:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<one>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  105 |         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 253 ms 99648 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 596 KB Output is correct
3 Correct 29 ms 8644 KB Output is correct
4 Correct 21 ms 8552 KB Output is correct
5 Correct 32 ms 8580 KB Output is correct
6 Correct 51 ms 8532 KB Output is correct
7 Correct 93 ms 8660 KB Output is correct
8 Correct 53 ms 8660 KB Output is correct
9 Correct 46 ms 8604 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 596 KB Output is correct
3 Correct 29 ms 8644 KB Output is correct
4 Correct 21 ms 8552 KB Output is correct
5 Correct 32 ms 8580 KB Output is correct
6 Correct 51 ms 8532 KB Output is correct
7 Correct 93 ms 8660 KB Output is correct
8 Correct 53 ms 8660 KB Output is correct
9 Correct 46 ms 8604 KB Output is correct
10 Correct 1 ms 468 KB Output is correct
11 Correct 1 ms 596 KB Output is correct
12 Correct 33 ms 8660 KB Output is correct
13 Correct 22 ms 8552 KB Output is correct
14 Correct 28 ms 8648 KB Output is correct
15 Correct 53 ms 8660 KB Output is correct
16 Correct 90 ms 8660 KB Output is correct
17 Correct 53 ms 8696 KB Output is correct
18 Correct 50 ms 8588 KB Output is correct
19 Execution timed out 1564 ms 118972 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 596 KB Output is correct
3 Correct 29 ms 8644 KB Output is correct
4 Correct 21 ms 8552 KB Output is correct
5 Correct 32 ms 8580 KB Output is correct
6 Correct 51 ms 8532 KB Output is correct
7 Correct 93 ms 8660 KB Output is correct
8 Correct 53 ms 8660 KB Output is correct
9 Correct 46 ms 8604 KB Output is correct
10 Correct 1 ms 468 KB Output is correct
11 Correct 1 ms 596 KB Output is correct
12 Correct 30 ms 8532 KB Output is correct
13 Correct 22 ms 8532 KB Output is correct
14 Correct 31 ms 8640 KB Output is correct
15 Correct 49 ms 8620 KB Output is correct
16 Correct 92 ms 8684 KB Output is correct
17 Correct 48 ms 8660 KB Output is correct
18 Correct 42 ms 8604 KB Output is correct
19 Runtime error 249 ms 99804 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 273 ms 99844 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 253 ms 99648 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -