foo.cc: In function 'int main()':
foo.cc:51:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 for(int j=0; j<map[i].size(); j++){
              ~^~~~~~~~~~~~~~
foo.cc:36:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 scanf("%d%d", &n, &m);
 ~~~~~^~~~~~~~~~~~~~~~
foo.cc:39:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 scanf("%d%d%d", &x, &y, &w);
 ~~~~~^~~~~~~~~~~~~~~~~~~~~~

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