/in/foo.cc: In function 'int main()':
/in/foo.cc:9:19: warning: 'i' is used uninitialized [-Wuninitialized]
    9 |         for(int i;i<n;i++){
      |                   ^
/in/foo.cc:9:17: note: 'i' was declared here
    9 |         for(int i;i<n;i++){
      |                 ^