stations.cpp:5:13: error: 'pair' does not name a type
5 | using pii = pair<int, int>;
| ^~~~
stations.cpp:6:13: error: 'pair' does not name a type
6 | using pll = pair<ll, ll>;
| ^~~~
stations.cpp:19:1: error: 'vector' does not name a type
19 | vector<int> adj[mxN];
| ^~~~~~
stations.cpp:22:24: error: 'vector' has not been declared
22 | void dfs(int v, int p, vector<int>& labels){
| ^~~~~~
stations.cpp:22:30: error: expected ',' or '...' before '<' token
22 | void dfs(int v, int p, vector<int>& labels){
| ^
stations.cpp: In function 'void dfs(int, int, int)':
stations.cpp:23:2: error: 'labels' was not declared in this scope
23 | labels[timer++] = v;
| ^~~~~~
stations.cpp:24:14: error: 'adj' was not declared in this scope
24 | for(int i : adj[v]) {
| ^~~
stations.cpp: At global scope:
stations.cpp:30:1: error: 'vector' does not name a type
30 | vector<int> label(int n, int k, vector<int> u, vector<int> v) {
| ^~~~~~
stations.cpp:41:37: error: 'vector' has not been declared
41 | int find_next_station(int s, int t, vector<int> c) {
| ^~~~~~
stations.cpp:41:43: error: expected ',' or '...' before '<' token
41 | int find_next_station(int s, int t, vector<int> c) {
| ^
stations.cpp: In function 'int find_next_station(int, int, int)':
stations.cpp:42:11: error: 'c' was not declared in this scope
42 | sort(all(c));
| ^
stations.cpp:12:17: note: in definition of macro 'all'
12 | #define all(x) (x).begin(),(x).end()
| ^
stations.cpp:42:2: error: 'sort' was not declared in this scope; did you mean 'short'?
42 | sort(all(c));
| ^~~~
| short