View Compilation Error

0_0_30274500_15907.cpp: In function 'void dfs(long long int, long long int, long long int)':
0_0_30274500_15907.cpp:21:15: error: 'p' was not declared in this scope
  for(auto i:v[p]){
               ^
0_0_30274500_15907.cpp:27:19: error: 'le' was not declared in this scope
    dfs(to,gem,len+le);
                   ^