foo.cc: In function 'void solve()':
foo.cc:45:19: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   45 |   if(up[x].size() < k){
      |      ~~~~~~~~~~~~~^~~
foo.cc:40:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   40 |  scanf("%d%d" , &x , &k);
      |  ~~~~~^~~~~~~~~~~~~~~~~~
foo.cc: In function 'int main()':
foo.cc:60:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   60 |  scanf("%d" , &n);int x,y;
      |  ~~~~~^~~~~~~~~~~
foo.cc:62:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   62 |   scanf("%d%d" , &x , &y);
      |   ~~~~~^~~~~~~~~~~~~~~~~~
foo.cc:69:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   69 |  scanf("%d" , &m);
      |  ~~~~~^~~~~~~~~~~

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