Submission #595547

#	Time	Username	Problem	Language	Result	Execution time	Memory
595547		ThegeekKnight16	Event Hopping (BOI22_events)	C++14	10 / 100	1584 ms	32716 KiB

events

#include <bits/stdc++.h>
using namespace std;
const int MAXN = 1e5 + 10;
int Inicio[MAXN], Fim[MAXN];
vector<int> Indices;
vector<int> grafo[MAXN];
int Marc[MAXN], Dist[MAXN];

void bfs(int v, int N)
{
    for (int i = 1; i <= N; i++) {Marc[i] = 0; Dist[i] = 1e9 + 10;}
    queue<int> q;
    Marc[v] = 1; Dist[v] = 0;
    q.push(v);
    
    while (!q.empty())
    {
        int cur = q.front(); q.pop();
        
        for (auto viz : grafo[cur])
        {
            if (Marc[viz]) continue;
            Dist[viz] = Dist[cur] + 1;
            Marc[viz] = 1;
            q.push(viz);
        }
    }
}

bool cmp(int a, int b)
{
    if (Fim[a] == Fim[b]) return Inicio[a] < Inicio[b];
    return Fim[a] > Fim[b];
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int N, Q;
    cin >> N >> Q;
    for (int i = 1; i <= N; i++)
    {
        cin >> Inicio[i] >> Fim[i];
        Indices.push_back(i);
    }
    sort(Indices.begin(), Indices.end(), cmp);
    
    for (int i = 0; i < Indices.size(); i++)
    {
        int id = Indices[i];
        for (int j = 0; j < Indices.size(); j++)
        {
            int jd = Indices[j];
            
            if (Inicio[jd] <= Fim[id] && Fim[id] <= Fim[jd]) {grafo[id].push_back(jd);}
        }
    }
    
    for (int q = 1; q <= Q; q++)
    {
        int X, Y;
        cin >> X >> Y;
        
        bfs(X, N);
        
        if (Dist[Y] == 1e9 + 10) cout << "impossible" << '\n';
        else cout << Dist[Y] << '\n';
    }
}

Compilation message (stderr)

events.cpp: In function 'int main()':
events.cpp:49:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   49 |     for (int i = 0; i < Indices.size(); i++)
      |                     ~~^~~~~~~~~~~~~~~~
events.cpp:52:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |         for (int j = 0; j < Indices.size(); j++)
      |                         ~~^~~~~~~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 10 / 10
• Subtask 3: 0 / 15
• Subtask 4: 0 / 15
• Subtask 5: 0 / 20
• Subtask 6: 0 / 30