#include<bits/stdc++.h> using namespace std; #include"stations.h" #define N 100005 int st[N],en[N],sz; vector<int> g[N]; void dfs(int s,int f){ st[s]=++sz; for(auto x:g[s]){ if(x==f)continue; dfs(x,s); } en[s]=sz; } vector<int> label(int n, int k, vector<int> u, vector<int> v){ int i,a,b; vector<int> vec; for(i=0;i<n;i++)g[i].clear(),vec.push_back(i); for(i=0;i<n-1;i++){ a=u[i],b=v[i]; g[a].push_back(b); g[b].push_back(a); } sz=0; dfs(0,-1); return vec; } int find_next_station(int s, int t,vector<int> c){ if(st[s]<=st[t]&&st[t]<=en[s]){ for(auto x:c){ if(st[s]<=st[x]&&st[x]<=st[t]&&st[t]<=en[x])return x; } } else{ for(auto x:c){ if(st[x]<st[s])return x; } } }

stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:43:1: warning: control reaches end of non-void function [-Wreturn-type]
   43 | }
      | ^