gondola.cpp: In function 'int valid(int, int*)':
gondola.cpp:5:3: error: 'pii' was not declared in this scope
5 | pii mi = mp(2e9, 1e9);
| ^~~
gondola.cpp:6:10: error: 'i' was not declared in this scope
6 | frange(i, n) {
| ^
gondola.cpp:6:3: error: 'frange' was not declared in this scope
6 | frange(i, n) {
| ^~~~~~
gondola.cpp:9:6: error: 'mi' was not declared in this scope
9 | if(mi.f > n) return 1;
| ^~
gondola.cpp:10:11: error: 'mi' was not declared in this scope
10 | int v = mi.f;
| ^~
gondola.cpp:11:3: error: 'forr' was not declared in this scope
11 | forr(i, mi.s+1, n) {
| ^~~~
gondola.cpp:10:7: warning: unused variable 'v' [-Wunused-variable]
10 | int v = mi.f;
| ^