foo.cc: In function 'int main()':
foo.cc:6:6: warning: unused variable 'n' [-Wunused-variable]
    6 |  int n;//试剂盒
      |      ^
foo.cc:8:6: warning: unused variable 'sum' [-Wunused-variable]
    8 |  int sum=num/k+k*0.01;//当num/k=k*0.01时sum最大
      |      ^~~
foo.cc:8:13: warning: 'num' is used uninitialized in this function [-Wuninitialized]
    8 |  int sum=num/k+k*0.01;//当num/k=k*0.01时sum最大
      |          ~~~^~
foo.cc:8:13: warning: 'k' is used uninitialized in this function [-Wuninitialized]

[Hydro](https://hydro.ac)提供评测服务