foo.cc: In function 'int main()':
foo.cc:33:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(long long j=0;j<=vec[i].size()-1;j++){
                     ~^~~~~~~~~~~~~~~~~
foo.cc:44:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
      while(((L-i+1)+1)/2<q.size()){
            ~~~~~~~~~~~~~^~~~~~~~~
foo.cc:52:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
      while(((L-i+1)+1)/2>q.size()){
            ~~~~~~~~~~~~~^~~~~~~~~
foo.cc:13:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld%lld",&n,&m);
  ~~~~~^~~~~~~~~~~~~~~~~~
foo.cc:14:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(long long i=1;i<=n;i++)scanf("%lld",&a[i]);
                             ~~~~~^~~~~~~~~~~~~~
foo.cc:17:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld%lld",&l,&r);
   ~~~~~^~~~~~~~~~~~~~~~~~

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