Edit to TOML header to compile and execute in one command for fuzz

Author: TianLangHin

competition/time-traveler/prob.md

@@ -1,6 +1,6 @@
 ---toml
 [fuzz]
-exec = ["./time-traveler", "generate"]
+exec = ["g++", "--std=c++20", "src/main.cpp", "-o", "time-traveler", "&&", "./time-traveler", "generate"]
 env = {}
 
 [judge]