foo.cc: In function 'int main()':
foo.cc:11:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<point>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   11 | #define FOR(i,x,y) for(i=x;i<=y;++i)
......
   66 |         FOR(j,0,e[i].v.size()-1){
      |             ~~~~~~~~~~~~~~~~~~~
foo.cc:66:9: note: in expansion of macro 'FOR'
   66 |         FOR(j,0,e[i].v.size()-1){
      |         ^~~
foo.cc:11:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<point>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   11 | #define FOR(i,x,y) for(i=x;i<=y;++i)
......
   68 |         FOR(k,0,e[0].v.size()-1)
      |             ~~~~~~~~~~~~~~~~~~~
foo.cc:68:9: note: in expansion of macro 'FOR'
   68 |         FOR(k,0,e[0].v.size()-1)
      |         ^~~
foo.cc:39:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   39 |     scanf("%d%d%d",&n,&m,&l);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~
foo.cc:46:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   46 |         scanf("%s",s);
      |         ~~~~~^~~~~~~~
foo.cc:55:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   55 |         scanf("%s",s);
      |         ~~~~~^~~~~~~~
foo.cc:58:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   58 |            scanf("%s",s);
      |            ~~~~~^~~~~~~~

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