/in/foo.cc: In function 'int main()':
/in/foo.cc:17:44: warning: 'k' may be used uninitialized [-Wmaybe-uninitialized]
   17 |                                 int k=n-i-j-k+1;
      |                                       ~~~~~^~
/in/foo.cc:17:37: note: 'k' was declared here
   17 |                                 int k=n-i-j-k+1;
      |                                     ^