/in/foo.cc: In function 'int read()':
/in/foo.cc:10:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
         if(ch=='-')tmp=-1;ch=getchar();
         ^~
/in/foo.cc:10:27: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
         if(ch=='-')tmp=-1;ch=getchar();
                           ^~
/in/foo.cc: In function 'int main()':
/in/foo.cc:36:9: warning: unused variable 'ans' [-Wunused-variable]
     int ans=0;
         ^~~