oj.uz

Submission #1069936

# Submission time Handle Problem Language Result Execution time Memory
1069936 2024-08-22T10:17:53 Z mindiyak Event Hopping (BOI22_events) C++14
10 / 100
 1500 ms 33620 KB 
#pragma GCC optimize("O1,O2,O3,Ofast,unroll-loops")
#include <bits/stdc++.h>
#include <string>
#include <iostream>
#include <cmath>
#include <numeric>
#include <stack>
#include <queue>
#include <set>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<int, int> pi;
typedef pair<ll, ll> pl;
typedef pair<ld, ld> pd;
typedef vector<int> vi;
typedef vector<bool> vb;
typedef vector<vector<int>> vvi;
typedef vector<vector<pi>> vvpi;
typedef vector<ld> vd;
typedef vector<long long> vl;
typedef vector<pi> vpi;
typedef vector<pl> vpl;
#define FOR(i, a, b) for (int i = a; i < (b); i++)
#define F0R(i, a) for (int i = 0; i < (a); i++)
#define FORd(i, a, b) for (int i = (b)-1; i >= a; i--)
#define F0Rd(i, a) for (int i = (a)-1; i >= 0; i--)
#define trav(a, x) for (auto &a : x)
#define uid(a, b) uniform_int_distribution<int>(a, b)(rng)
#define len(x) (int)(x).size()
#define mp make_pair
#define pb push_back
#define F first
#define nl endl
#define S second
#define lb lower_bound
#define ub upper_bound
#define aint(x) x.begin(), x.end()
#define raint(x) x.rbegin(), x.rend()
#define ins insert
const int M = 1e9+7;
void init(string name)
{
    freopen((name + ".in").c_str(), "r", stdin);
    freopen((name + ".out").c_str(), "w", stdout);
}
void fastIO()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
}
 
int n,q;
vector<pair<pi,int>> arr;
vvi paths(1e5+5);
 
void solve()
{   
    cin >> n >> q;
    FOR(i,0,n){
        int a,b;cin >> a >> b;
        arr.pb({{b,a},i+1});
    }

    sort(arr.rbegin(),arr.rend());

    FOR(i,0,n){
        FOR(j,0,n){
            if(i == j)continue;
            // cerr << i << " " << j << " " << arr[j].F.F << " " << arr[i].F.S << " " << arr[i].F.F << endl;
            if(arr[i].F.S <= arr[j].F.F && arr[i].F.F >= arr[j].F.F){
                paths[arr[j].S].pb(arr[i].S);
            }
            else{
                if(j>i)break;
            }
        }
    }

    // FOR(i,1,n+1){
    //     cerr << i << " -> ";
    //     for(int j:paths[i])cerr << j << " ";
    //     cerr << endl;
    // }cerr << endl;

    FOR(i,0,q){
        int a,b;cin >> a >> b;

        vi visited(n+2,0);
        vi dist(n+2,1e9);

        priority_queue<pi> pq;
        pq.push({0,a});
        dist[a] = 0;

        while(!pq.empty()){
            int c = pq.top().S;pq.pop();
            if(visited[c])continue;
            visited[c] = 1;

            for(int d:paths[c]){
                if(dist[d] > dist[c] + 1){
                    dist[d] = dist[c] + 1;
                    pq.push({-dist[d],d});
                }
            }
        }

        // FOR(i,1,n+1){
        //     cerr << dist[i] << " ";
        // }cerr << endl;

        if(dist[b] == 1e9)cout << "impossible" << endl;
        else cout << dist[b] << endl;
    }
}   
 
 
int main()
{
    fastIO();
    // init("test");
    int t = 1;
    // cin >> t;
    while (t--)
        solve();
    return 0;
}

Compilation message

events.cpp: In function 'void init(std::string)':
events.cpp:45:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   45 |     freopen((name + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
events.cpp:46:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |     freopen((name + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2652 KB Output is correct
2 Execution timed out 1588 ms 5504 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 2652 KB Output is correct
2 Correct 1 ms 2652 KB Output is correct
3 Correct 4 ms 2652 KB Output is correct
4 Correct 3 ms 2652 KB Output is correct
5 Correct 3 ms 2648 KB Output is correct
6 Correct 9 ms 3676 KB Output is correct
7 Correct 20 ms 4444 KB Output is correct
8 Correct 19 ms 5468 KB Output is correct
9 Correct 80 ms 6748 KB Output is correct

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2652 KB Output is correct
2 Correct 1 ms 2652 KB Output is correct
3 Correct 4 ms 2652 KB Output is correct
4 Correct 3 ms 2652 KB Output is correct
5 Correct 3 ms 2648 KB Output is correct
6 Correct 9 ms 3676 KB Output is correct
7 Correct 20 ms 4444 KB Output is correct
8 Correct 19 ms 5468 KB Output is correct
9 Correct 80 ms 6748 KB Output is correct
10 Correct 1 ms 2648 KB Output is correct
11 Correct 1 ms 2648 KB Output is correct
12 Correct 4 ms 2652 KB Output is correct
13 Correct 3 ms 2648 KB Output is correct
14 Correct 3 ms 2652 KB Output is correct
15 Correct 8 ms 3676 KB Output is correct
16 Correct 18 ms 4440 KB Output is correct
17 Correct 23 ms 5468 KB Output is correct
18 Correct 81 ms 6908 KB Output is correct
19 Execution timed out 1563 ms 33620 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 2652 KB Output is correct
2 Correct 1 ms 2652 KB Output is correct
3 Correct 4 ms 2652 KB Output is correct
4 Correct 3 ms 2652 KB Output is correct
5 Correct 3 ms 2648 KB Output is correct
6 Correct 9 ms 3676 KB Output is correct
7 Correct 20 ms 4444 KB Output is correct
8 Correct 19 ms 5468 KB Output is correct
9 Correct 80 ms 6748 KB Output is correct
10 Correct 1 ms 2652 KB Output is correct
11 Correct 1 ms 2652 KB Output is correct
12 Correct 4 ms 2652 KB Output is correct
13 Correct 2 ms 2652 KB Output is correct
14 Correct 2 ms 2652 KB Output is correct
15 Correct 8 ms 3676 KB Output is correct
16 Correct 18 ms 4444 KB Output is correct
17 Correct 20 ms 5720 KB Output is correct
18 Correct 81 ms 6744 KB Output is correct
19 Execution timed out 1555 ms 5572 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 1542 ms 5624 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 2652 KB Output is correct
2 Execution timed out 1588 ms 5504 KB Time limit exceeded
3 Halted 0 ms 0 KB -