/in/foo.cc: In function 'void read(T&)':
/in/foo.cc:12:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
         if(c=='-')f=-1;c=getchar();
         ^~
/in/foo.cc:12:24: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
         if(c=='-')f=-1;c=getchar();
                        ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:46:10: warning: unused variable 'flag' [-Wunused-variable]
     bool flag=check(ans);
          ^~~~