foo.cc: In function 'int get(int, int)':
foo.cc:38:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Edge>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |     for (int i = 0; i < graph_r[node].size(); i++) {
      |                     ~~^~~~~~~~~~~~~~~~~~~~~~
foo.cc: In function 'int work()':
foo.cc:85:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Edge>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   85 |         for (int i = 0; i < graph[elem].size(); i++) {
      |                         ~~^~~~~~~~~~~~~~~~~~~~
foo.cc:56:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   56 |     scanf("%d%d%d%d", &n, &m, &k, &p);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:63:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   63 |         scanf("%d%d%d", &a, &b, &c);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~
foo.cc: In function 'int main()':
foo.cc:105:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  105 |     scanf("%d", &T);
      |     ~~~~~^~~~~~~~~~

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