foo.cc: In function 'int main()':
foo.cc:4:5: warning: assuming signed overflow does not occur when assuming that (X + c) >= X is always true [-Wstrict-overflow]
 int main()
     ^~~~
foo.cc:4:5: warning: assuming signed overflow does not occur when assuming that (X + c) >= X is always true [-Wstrict-overflow]
foo.cc:4:5: warning: assuming signed overflow does not occur when assuming that (X + c) >= X is always true [-Wstrict-overflow]

自豪的采用HydroJudge(https://github.com/hydro-dev/Hydro)进行评测。