Problem	railway
User	ISAAC
Submission Time	2026-09-27 09:22:45
Score	0
Max Time	N/A
Max Memory	N/A

Compile Error

railway.cpp: In function ‘void dfs(long long int, long long int)’:
railway.cpp:9:4: error: ‘idx’ was not declared in this scope
9 | p[idx][0] = x;
| ^~~