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当Java程序执行try块、catch块时遇到了return语句或throw语句,这两个语句都会导致该方法立即结束,但是系统并不会立即执行这两个语句,而是去寻找该异常处理流程中是否包含了finall块:
如果没有finall块,程序立即执行return语句或throw语句,方法终止;
如果有finally块,系统立即开始执行finally块——只有当finally块执行完成后,系统才会再次跳回来执行try块、catch块里的return或throw语句。如果finally快里没有return或throw语句,特别注意此时系统已经把要返回的变量的值保存了一个副本,即使在finally块里该变量 ...
This article has been translated into Spanish and French. Other translations are welcome.
While it is easy once you get the hang of it, the A* (pronounced A-star) algorithm can be complicated for beginners. There are plenty of articles on the web that explain A*, but most are written for people who ...
不用递归,改用栈,某人自己写了个方法
由于篇幅太长,就不拿出来丢人现眼了...
这个大概耗时80ms,只能说一般而已。
在第2个的基础上稍微优化了点,减少了递归次数
package test;
public class CoinToSum3 {
private static final int[] COINS = new int[] { 1, 2, 5, 10, 20, 50 };
private static int count = 0;
public static void main(String[] args) throws Exception {
System.out.println(System.currentTimeMillis());
calc(100, 5, ...
常用的递归解法
package test;
public class CoinToSum2 {
private static final int[] COINS = new int[] { 1, 2, 5, 10, 20, 50 };
private static final int SUM = 100;
private static int cnt = 0;
public static void main(String[] args) {
System.out.println(System.currentTimeMillis());
calc(0, ...