traffic.cpp: In function 'void dfs1(std::vector<std::vector<int> >&, std::vector<long long int>&, std::vector<long long int>&, std::vector<int>&, int, int)':
traffic.cpp:11:18: error: invalid initialization of reference of type 'std::vector<int>&' from expression of type 'int'
11 | dfs1(gr,w,st,v,u);
| ^
traffic.cpp:6:77: note: in passing argument 4 of 'void dfs1(std::vector<std::vector<int> >&, std::vector<long long int>&, std::vector<long long int>&, std::vector<int>&, int, int)'
6 | void dfs1(vector<vector<int>>& gr,vector<ll>& w,vector<ll>& st,vector<int>& pa,int u,int p) {
| ~~~~~~~~~~~~~^~