/in/foo.cc: In function 'int main()':
/in/foo.cc:18:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while(j<=N && mp.size()<m){
                 ~~~~~~~~~^~
/in/foo.cc:22:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if(mp.size()==m) Ans=min(Ans,j-i+1);
      ~~~~~~~~~^~~