/in/foo.cc: In function 'int main()':
/in/foo.cc:7:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(long long j=1;j<=k;j++){
                    ~^~~
/in/foo.cc:8:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(long long w=1;w<=k;w++){
                     ~^~~
/in/foo.cc:10:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if((w*w+j*j)>ans){
        ~~~~~~~~~^~~~
/in/foo.cc:5:21: warning: unused variable 'm' [-Wunused-variable]
  unsigned long long m,n,k,ans=0;
                     ^
/in/foo.cc:5:23: warning: unused variable 'n' [-Wunused-variable]
  unsigned long long m,n,k,ans=0;
                       ^