运行 ID: 1588

Main.cc: In function ‘int main()’:
Main.cc:10:9: error: ‘k’ was not declared in this scope
   while(k<=d*2-a*2+1){
         ^
Main.cc:4:7: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&d);
  ~~~~~^~~~~~~~~