foo.cc: In function 'int main()':
foo.cc:173:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for (int i = 1; i < point[indidx].size(); i ++ )
                             ~~^~~~~~~~~~~~~~~~~~~~~~
foo.cc:113:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d", &x, &y);
         ~~~~~^~~~~~~~~~~~~~~~