Submission #992976

#	Time	Username	Problem	Language	Result	Execution time	Memory
992976		vjudge1	Stations (IOI20_stations)	C++17	100 / 100	668 ms	1448 KiB

stations

#include<bits/stdc++.h>
using namespace std;
#define all(a) a.begin(), a.end()
vector<int>Vis, new_;
vector<vector<int>>A;
bool even;
int time_;
void dfs(int ind){
    Vis[ind]=1;
    bool odd=!even;
    if(!odd) new_[ind]=time_++;
    for(int i=0;i<A[ind].size();i++)
        if(!Vis[A[ind][i]]){
            even=odd;
            dfs(A[ind][i]);
        }
    if(odd) new_[ind]=time_++;
}
vector<int> label(int n, int k, vector<int> u, vector<int> v) {
    Vis.clear(), A.clear(), new_.clear();
    Vis.resize(n), A.resize(n), new_.resize(n);
    time_=0, even=1;
    for(int i=0;i<n-1;i++)
        A[u[i]].push_back(v[i]), A[v[i]].push_back(u[i]);
    dfs(0);
    return new_;
}
int find_next_station(int s, int t, vector<int> c) {
    if(c[0]<s){
        if(t>s || t<=c.front()) return c.front();
        for(int i=c.size()-1;i>=0;i--)
            if(c[i]<=t)
                return c[i];
    }
    else{
        if(t<s || t>=c.back()) return c.back();
        for(int i=0;i<c.size();i++)
            if(c[i]>=t)
                return c[i];
    }
}

Compilation message (stderr)

stations.cpp: In function 'void dfs(int)':
stations.cpp:12:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   12 |     for(int i=0;i<A[ind].size();i++)
      |                 ~^~~~~~~~~~~~~~
stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:37:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |         for(int i=0;i<c.size();i++)
      |                     ~^~~~~~~~~
stations.cpp:41:1: warning: control reaches end of non-void function [-Wreturn-type]
   41 | }
      | ^

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