foo.cc: In function 'void read(_T&)':
foo.cc:12:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
     if(_t=='-') _flag=true,_t=getchar(); _x=_t-'0';
     ^~
foo.cc:12:42: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
     if(_t=='-') _flag=true,_t=getchar(); _x=_t-'0';
                                          ^~
foo.cc: In function 'int main()':
foo.cc:44:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
         mid=le+ri>>1;
             ~~^~~

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