前序遍历

Status	Submit By	Time	Memory	Language	Code	Submit At
AC	沈鼎皓	9ms	6.3 MiB	C++17(O2)	342 Bytes	2025-7-28 4:55:08
AC	DH-LZR	9ms	6.3 MiB	C++14(O2)	359 Bytes	2025-8-1 11:23:19
AC	jike1994	10ms	5.8 MiB	C++14(O2)	423 Bytes	2024-6-21 15:10:23
AC	lsd	18ms	6 MiB	C++14(O2)	489 Bytes	2024-8-12 12:15:14