java写的，ac了 public static void main(String[] args) { Scanner cin = new Scanner(System.in); while (cin.hasNextInt()) { int a = cin.nextInt(); int b = cin.nextInt(); int k = cin.nextInt(); int v = cin.nextInt(); int res=0; while(a>0){ if(b>=k-1){ b=b-(k-1); a-=k*v; }else if(b<(k-1) && b!=0){ a-=v*(b+1); b=0; }else{ a-=v; } res++; } System.out.println(res); } }