foo.cc: In function 'int main()':
foo.cc:7:8: warning: unused variable 'd' [-Wunused-variable]
  int n,d,i,x;
        ^
foo.cc:8:12: warning: unused variable 'c' [-Wunused-variable]
  float a,b,c;
            ^

正在同步测试数据，请稍后
[Hydro](https://hydro.ac)提供评测服务