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:56:26: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
         while(!sa.empty()&&sa.top()==aim||!sb.empty()&&sb.top()==aim){
               ~~~~~~~~~~~^~~~~~~~~~~~~~~

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