foo.cc: In function 'int main()':
foo.cc:42:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
     if(m==5)
     ^~
foo.cc:44:9: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
         cout<<m1<<" "<<m2<<" "<<m3;
         ^~~~
foo.cc:45:5: error: 'else' without a previous 'if'
     else
     ^~~~

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