Submission #595538

#	Time	Username	Problem	Language	Result	Execution time	Memory
595538		Sofiatpc	Event Hopping (BOI22_events)	C++14	10 / 100	1586 ms	32816 KiB

events

#include <bits/stdc++.h>

using namespace std;

const int MAXN = 100005;
int s[MAXN], e[MAXN], dist[MAXN];
vector<int> adj[MAXN];

void bfs(int S)//S eh um id
{
    vector< int > fila;
    dist[S]=0;
    fila.push_back(S);
    int ptr = 0;
    while(ptr!=fila.size())
    {
        int x = fila[ptr];
        ptr++;
        for(int i = 0; i < (int)adj[x].size(); i++)
        {
            int viz=adj[x][i];
            if(dist[viz]!=-1&&dist[viz]<=dist[x]+1)continue;
            dist[viz]=dist[x]+1;
            fila.push_back(viz);
        }
    }
}

int main()
{
    int N,Q; cin>>N>>Q;
    for(int i = 1; i <= N; i++)cin>>s[i]>>e[i];

    for(int i = 1; i <= N; i++)
        for(int j = 1; j <= N; j++)
        {
            if(i==j)continue;
            if(s[j]<=e[i] && e[i]<=e[j])adj[i].push_back(j);
        }

    for(int q = 1; q <= Q; q++)
    {
        int sx,ex;
        cin>>sx>>ex;

        for(int i = 1; i <= N; i++)dist[i]=-1;
        bfs(sx);

        if(dist[ex]==-1)cout<<"impossible\n";
        else cout<<dist[ex]<<"\n";
    }

}

Compilation message (stderr)

events.cpp: In function 'void bfs(int)':
events.cpp:15:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   15 |     while(ptr!=fila.size())
      |           ~~~^~~~~~~~~~~~~

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