Problem	promotion
User	PlayVoltz
Submission Time	2023-10-10 17:37:03
Score	0
Max Time	N/A
Max Memory	N/A

Compile Error

promotion.cpp: In member function ‘void node::build()’:
promotion.cpp:24:21: error: ‘nv’ was not declared in this scope
24 | if (s==e){tree.pb(nv);}
| ^~