foo.cc: In function ‘int main()’:
foo.cc:10:17: warning: ‘k’ may be used uninitialized [-Wmaybe-uninitialized]
   10 |                 if(m==k)
      |                 ^~
foo.cc:5:17: note: ‘k’ was declared here
    5 |         int n,m,k,cnt=0;
      |                 ^