/in/foo.cc: In function 'int main()':
/in/foo.cc:7:19: warning: unused variable 'k' [-Wunused-variable]
    7 |         int i, j, k, t, sum, ave, n, l, r, a[200] = { 0 }, flag;
      |                   ^
/in/foo.cc:7:22: warning: unused variable 't' [-Wunused-variable]
    7 |         int i, j, k, t, sum, ave, n, l, r, a[200] = { 0 }, flag;
      |                      ^