foo.cc: In function 'int main()':
foo.cc:21:21: warning: unused variable 'k' [-Wunused-variable]
   21 |         long long n,k=0,x=0;
      |                     ^
foo.cc:21:25: warning: unused variable 'x' [-Wunused-variable]
   21 |         long long n,k=0,x=0;
      |                         ^
foo.cc: In function 'int zuishaocishu(int, int)':
foo.cc:17:1: warning: control reaches end of non-void function [-Wreturn-type]
   17 | }
      | ^

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