oj.uz

Submission #736171

# Submission time Handle Problem Language Result Execution time Memory
736171 2023-05-05T09:39:48 Z ksu2009en Event Hopping (BOI22_events) C++14
10 / 100
 272 ms 65720 KB 
#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 long long 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[5007][5007];
vector<ll>start_here[5007];

vector<one>a;

void count_dp(one fin){
    for(int i = 0; i < a.size(); i++)
        dp[i][fin.ind] = 1e9;
    
    dp[fin.ind][fin.ind] = 0;
    
    bool ok = false;
    
    multiset<ll>st;
    
    for(int ind = a.size() - 1; ind >= 0; ind--){
        auto i = a[ind];
        
        if(i.ind == fin.ind){
            //cout << i.ind << ' ' << ind << endl;
            ok = true;
            st.insert(0);
        }
        else if(ok){
            if(st.empty()){
               // cout << "st.empty() " << i.ind << endl;
                dp[i.ind][fin.ind] = 1e9;
                st.insert(1e9);
            }
            else{
              //  cout << i.ind << endl;
              //  for(auto j: st)
              //      cout << j << ' ';
              //  cout << endl;
                dp[i.ind][fin.ind] = *st.begin();
                if(*st.begin() != (ll)(1e9))
                    dp[i.ind][fin.ind]++;
                                
                st.insert(dp[i.ind][fin.ind]);
            }
        }
        else{
           // cout << "not yet " << i.ind << endl;
            st.insert(1e9);
        }
        
        if(ind - 1 >= 0){
            for(int del = i.second; del > a[ind - 1].second; del--)
                for(auto j: start_here[del]){
                    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;
}

int main(){
    srand(time(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);
    
    for(auto i: a){
        count_dp(i);
    }
   
    while(q--){
        ll l, r;
        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)':
events.cpp:59:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<one>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   59 |     for(int i = 0; i < a.size(); i++)
      |                    ~~^~~~~~~~~~

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 424 KB Output is correct
2 Runtime error 250 ms 64648 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 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 52 ms 12420 KB Output is correct
4 Correct 53 ms 12412 KB Output is correct
5 Correct 70 ms 12384 KB Output is correct
6 Correct 123 ms 12352 KB Output is correct
7 Correct 153 ms 12496 KB Output is correct
8 Correct 100 ms 12484 KB Output is correct
9 Correct 107 ms 12380 KB Output is correct

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 52 ms 12420 KB Output is correct
4 Correct 53 ms 12412 KB Output is correct
5 Correct 70 ms 12384 KB Output is correct
6 Correct 123 ms 12352 KB Output is correct
7 Correct 153 ms 12496 KB Output is correct
8 Correct 100 ms 12484 KB Output is correct
9 Correct 107 ms 12380 KB Output is correct
10 Correct 1 ms 432 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 49 ms 12412 KB Output is correct
13 Correct 50 ms 12432 KB Output is correct
14 Correct 59 ms 12396 KB Output is correct
15 Correct 123 ms 12372 KB Output is correct
16 Correct 151 ms 12600 KB Output is correct
17 Correct 105 ms 12400 KB Output is correct
18 Correct 95 ms 12276 KB Output is correct
19 Runtime error 75 ms 43408 KB Execution killed with signal 11
20 Halted 0 ms 0 KB -

Subtask #4
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 52 ms 12420 KB Output is correct
4 Correct 53 ms 12412 KB Output is correct
5 Correct 70 ms 12384 KB Output is correct
6 Correct 123 ms 12352 KB Output is correct
7 Correct 153 ms 12496 KB Output is correct
8 Correct 100 ms 12484 KB Output is correct
9 Correct 107 ms 12380 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 468 KB Output is correct
12 Correct 58 ms 12424 KB Output is correct
13 Correct 50 ms 12416 KB Output is correct
14 Correct 57 ms 12408 KB Output is correct
15 Correct 132 ms 12328 KB Output is correct
16 Correct 155 ms 12496 KB Output is correct
17 Correct 102 ms 12496 KB Output is correct
18 Correct 92 ms 12300 KB Output is correct
19 Runtime error 248 ms 65720 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 272 ms 64584 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 424 KB Output is correct
2 Runtime error 250 ms 64648 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -