/in/foo.cc: In function 'int main()':
/in/foo.cc:6:11: warning: unused variable 'k' [-Wunused-variable]
    6 | int i , j,k,sum=0,cnt,s;
      |           ^
/in/foo.cc:35:4: warning: 't' may be used uninitialized [-Wmaybe-uninitialized]
   35 | cnt+=j;
      | ~~~^~~
/in/foo.cc:7:5: note: 't' was declared here
    7 | int t;
      |     ^