foo.cc: In function 'void read(T&)':
foo.cc:30:1: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
 for(res=ch-48;isdigit(ch=getchar());res=(res<<1)+(res<<3)+ch - 48);flag&&(res=-res);}
 ^~~
foo.cc:30:68: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
 for(res=ch-48;isdigit(ch=getchar());res=(res<<1)+(res<<3)+ch - 48);flag&&(res=-res);}
                                                                    ^~~~

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