/in/foo.cc: In function 'int main()':
/in/foo.cc:32:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
         if(y<x) swap(x, y); a[i].x=x, a[i].y=y;
         ^~
/in/foo.cc:32:29: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
         if(y<x) swap(x, y); a[i].x=x, a[i].y=y;
                             ^
/in/foo.cc:28:9: warning: variable 'tp' set but not used [-Wunused-but-set-variable]
     int tp;
         ^~