oj.uz

Submission #721808

# Submission time Handle Problem Language Result Execution time Memory
721808 2023-04-11T07:30:06 Z Mr_Husanboy Event Hopping (BOI22_events) C++17
10 / 100
 1500 ms 61468 KB 
#include<bits/stdc++.h>
using namespace std;
 
#define all(a) (a).begin(), (a).end()
template<typename T>
int len(T &a){
    return a.size();
}
using ll = long long;
const int inf = 1e9;
const ll infl = 1e18;
#define ff first
#define ss second

void solve(){
    int n, q; cin >> n >> q;
    vector<pair<int,int>> e(n);
   // map<int,int> mp;
    for(int i = 0; i < n; i ++){
        cin >> e[i].ff >> e[i].ss; 
        //mp[e[i].ff] = 1; mp[e[i].ss] = 1;
    }
    vector<vector<int>> g(n);
    for(int i = 0; i < n; i ++){
        for(int j = 0;j < n; j ++){
            if(i == j) continue;
            if(e[i].ss >= e[j].ff && e[i].ss <= e[j].ss){
                //cout << i + 1 << ' ' << j + 1 << endl;
                g[i].push_back(j);
            }
        }
    }
    if(n > 3000) assert(0);
    vector dis(n, vector(n, 1e9));
    auto bfs = [&](int i)->void{
        queue<int> q;
        vector<int> used(n);
        q.push(i);
        dis[i][i] = 0;
        used[i] = 1;
        while(!q.empty()){
            int t = q.front();
            q.pop();
            for(auto u : g[t]){
                if(used[u]) continue;
                used[u] = 1;
                dis[i][u] = dis[i][t] + 1;
                q.push(u);
            }
        }
    };
    vector<int> done(n);
    while(q --){
        int a, b; cin >> a >> b;
        a --; b --;
        if(!done[a]) bfs(a);
        if(dis[a][b] == inf){
            cout << "impossible\n";
        }else cout << dis[a][b] << '\n';
    }
}

int main(){
    ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
    int testcases = 1;
    //cin >> testcases;
    while(testcases --){
        solve();
        if(testcases) cout << '\n';
        #ifdef LOCAL
        else cout << '\n';
        cout << "__________________" << endl;
        #endif
    }
    return 0;
}

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Execution timed out 1575 ms 3632 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 11 ms 8200 KB Output is correct
4 Correct 9 ms 8236 KB Output is correct
5 Correct 10 ms 8184 KB Output is correct
6 Correct 15 ms 8916 KB Output is correct
7 Correct 26 ms 9820 KB Output is correct
8 Correct 26 ms 10900 KB Output is correct
9 Correct 99 ms 12244 KB Output is correct

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 11 ms 8200 KB Output is correct
4 Correct 9 ms 8236 KB Output is correct
5 Correct 10 ms 8184 KB Output is correct
6 Correct 15 ms 8916 KB Output is correct
7 Correct 26 ms 9820 KB Output is correct
8 Correct 26 ms 10900 KB Output is correct
9 Correct 99 ms 12244 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 10 ms 8152 KB Output is correct
13 Correct 9 ms 8188 KB Output is correct
14 Correct 10 ms 8148 KB Output is correct
15 Correct 14 ms 9024 KB Output is correct
16 Correct 24 ms 9812 KB Output is correct
17 Correct 29 ms 10836 KB Output is correct
18 Correct 110 ms 12240 KB Output is correct
19 Runtime error 168 ms 61468 KB Execution killed with signal 6
20 Halted 0 ms 0 KB -

Subtask #4
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 11 ms 8200 KB Output is correct
4 Correct 9 ms 8236 KB Output is correct
5 Correct 10 ms 8184 KB Output is correct
6 Correct 15 ms 8916 KB Output is correct
7 Correct 26 ms 9820 KB Output is correct
8 Correct 26 ms 10900 KB Output is correct
9 Correct 99 ms 12244 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 10 ms 8256 KB Output is correct
13 Correct 9 ms 8148 KB Output is correct
14 Correct 10 ms 8148 KB Output is correct
15 Correct 14 ms 8916 KB Output is correct
16 Correct 24 ms 9812 KB Output is correct
17 Correct 25 ms 10888 KB Output is correct
18 Correct 100 ms 12248 KB Output is correct
19 Execution timed out 1584 ms 3536 KB Time limit exceeded
20 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1567 ms 3760 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #6
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Execution timed out 1575 ms 3632 KB Time limit exceeded
3 Halted 0 ms 0 KB -