Submission #674163

#	Time	Username	Problem	Language	Result	Execution time	Memory
674163		Essa2006	Stations (IOI20_stations)	C++14	31.04 / 100	867 ms	756 KiB

stations

#include<bits/stdc++.h>
using namespace std;
vector<int>Vis, new_, dt, ft;
vector<vector<int>>A;
int time_;
void dfs(int ind){
    Vis[ind]=1, dt[ind]=time_++;
    for(int i=0;i<A[ind].size();i++)
        if(!Vis[A[ind][i]])
            dfs(A[ind][i]);
    ft[ind]=time_++;
}
vector<int> label(int n, int k, vector<int> u, vector<int> v) {
    Vis.clear(), A.clear(), new_.clear(), dt.clear(), ft.clear();
    Vis.resize(n), A.resize(n), new_.resize(n), dt.resize(n), ft.resize(n);
    time_=0;
    for(int i=0;i<n-1;i++)
        A[u[i]].push_back(v[i]), A[v[i]].push_back(u[i]);
    dfs(0);
    for(int i=0;i<n;i++){
        new_[i]=dt[i]*2000+ft[i];
    }
    return new_;
}
int find_next_station(int s, int t, vector<int> c) {
    int dt_t=t/2000, ft_t=t%2000;
    for(int i=1;i<c.size();i++){
        int dt_c=c[i]/2000, ft_c=c[i]%2000;
        if(dt_t>=dt_c && ft_t<=ft_c)
            return c[i];
    }
    return c[0];
}

Compilation message (stderr)

stations.cpp: In function 'void dfs(int)':
stations.cpp:8:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    8 |     for(int i=0;i<A[ind].size();i++)
      |                 ~^~~~~~~~~~~~~~
stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:27:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |     for(int i=1;i<c.size();i++){
      |                 ~^~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 8
• Subtask 3: 0 / 16
• Subtask 4: 10 / 10
• Subtask 5: 21.0422 / 61