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java:递归:10元钱按1,2,5元任意组合

package game;
public class Money {
 public static void main(String[] args) {
  fun("", 10);
  System.out.println("总共算法:" + i);
 }
 // 10元钱的组成,1,2,5任意组合
 public static int i = 1;
 public static void fun(String log, int n) {
  // int num = n;
  if (0 == n) {
   System.out.println(log.substring(0, log.length() - 1) + "=");
   return;
  } else if (1 == n) {
   System.out.println(log + "1" + "=");
   return;
  }
  if (n >= 1)
   fun(log + "1+", n - 1);
  if (n >= 2)
   fun(log + "2+", n - 2);
  if (n >= 5)
   fun(log + "5+", n - 5);
  i++;
 }
}


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