Problem	card
User	newplayer
Submission Time	2024-02-09 04:19:51
Score	0
Max Time	N/A
Max Memory	N/A

Compile Error

card.cpp: In function ‘int main()’:
card.cpp:18:20: error: ‘length’ was not declared in this scope
18 | for (int i=0;i<length(command);i++){
| ^~~~~~