Problem	nis
User	FIips
Submission Time	2025-06-10 00:40:47
Score	0
Max Time	N/A
Max Memory	N/A

Compile Error

nis.cpp: In function ‘int32_t main()’:
nis.cpp:70:18: error: ‘idx’ was not declared in this scope
70 | int ans = query(idx - 1) % mod;
| ^~~