增加淘宝群内容，修改部分文件组织

数据结构(双语)/数据结构 day16【瑞客论坛 www.ruike1.com】/代码/01-复杂度/src/com/mj/Main.java

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+package com.mj;
+
+public class Main {
+	
+	/* 0 1 2 3 4 5
+	 * 0 1 1 2 3 5 8 13 ....
+	 */
+	
+	// O(2^n)
+	public static int fib1(int n) {
+		if (n <= 1) return n;
+		return fib1(n - 1) + fib1(n - 2);
+	}
+	
+	// O(n)
+	public static int fib2(int n) {
+		if (n <= 1) return n;
+		
+		int first = 0;
+		int second = 1;
+		for (int i = 0; i < n - 1; i++) {
+			int sum = first + second;
+			first = second;
+			second = sum;
+		}
+		return second;
+	}
+	
+	public static int fib3(int n) {
+		if (n <= 1) return n;
+		
+		int first = 0;
+		int second = 1;
+		while (n-- > 1) {
+			second += first;
+			first = second - first;
+		}
+		return second;
+	}
+	
+
+	public static void main(String[] args) {
+		int n = 12;
+		
+		System.out.println(fib2(n));
+		System.out.println(fib3(n));
+		
+//		TimeTool.check("fib1", new Task() {
+//			public void execute() {
+//				System.out.println(fib1(n));
+//			}
+//		});
+//		
+//		TimeTool.check("fib2", new Task() {
+//			public void execute() {
+//				System.out.println(fib2(n));
+//			}
+//		});
+	}
+	
+	public static void test1(int n) {
+		// 汇编指令
+		
+		// 1
+		if (n > 10) { 
+			System.out.println("n > 10");
+		} else if (n > 5) { // 2
+			System.out.println("n > 5");
+		} else {
+			System.out.println("n <= 5"); 
+		}
+		
+		// 1 + 4 + 4 + 4
+		for (int i = 0; i < 4; i++) {
+			System.out.println("test");
+		}
+		
+		// 140000
+		// O(1)
+		// O(1)
+	}
+
+	public static void test2(int n) {
+		// O(n)
+		// 1 + 3n
+		for (int i = 0; i < n; i++) {
+			System.out.println("test");
+		}
+	}
+
+	public static void test3(int n) {
+		// 1 + 2n + n * (1 + 3n)
+		// 1 + 2n + n + 3n^2
+		// 3n^2 + 3n + 1
+		// O(n^2)
+		
+		// O(n)
+		for (int i = 0; i < n; i++) {
+			for (int j = 0; j < n; j++) {
+				System.out.println("test");
+			}
+		}
+	}
+
+	public static void test4(int n) {
+		// 1 + 2n + n * (1 + 45)
+		// 1 + 2n + 46n
+		// 48n + 1
+		// O(n)
+		for (int i = 0; i < n; i++) {
+			for (int j = 0; j < 15; j++) {
+				System.out.println("test");
+			}
+		}
+	}
+
+	public static void test5(int n) {
+		// 8 = 2^3
+		// 16 = 2^4
+		
+		// 3 = log2(8)
+		// 4 = log2(16)
+		
+		// 执行次数 = log2(n)
+		// O(logn)
+		while ((n = n / 2) > 0) {
+			System.out.println("test");
+		}
+	}
+
+	public static void test6(int n) {
+		// log5(n)
+		// O(logn)
+		while ((n = n / 5) > 0) {
+			System.out.println("test");
+		}
+	}
+
+	public static void test7(int n) {
+		// 1 + 2*log2(n) + log2(n) * (1 + 3n)
+		
+		// 1 + 3*log2(n) + 2 * nlog2(n)
+		// O(nlogn)
+		for (int i = 1; i < n; i = i * 2) {
+			// 1 + 3n
+			for (int j = 0; j < n; j++) {
+				System.out.println("test");
+			}
+		}
+	}
+
+	public static void test10(int n) {
+		// O(n)
+		int a = 10;
+		int b = 20;
+		int c = a + b;
+		int[] array = new int[n];
+		for (int i = 0; i < array.length; i++) {
+			System.out.println(array[i] + c);
+		}
+	}
+}

数据结构(双语)/数据结构 day16【瑞客论坛 www.ruike1.com】/代码/01-复杂度/src/com/mj/Times.java

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+package com.mj;
+
+import java.text.SimpleDateFormat;
+import java.util.Date;
+
+public class Times {
+	private static final SimpleDateFormat fmt = new SimpleDateFormat("HH:mm:ss.SSS");
+	
+	public interface Task {
+		void execute();
+	}
+	
+	public static void test(String title, Task task) {
+		if (task == null) return;
+		title = (title == null) ? "" : ("【" + title + "】");
+		System.out.println(title);
+		System.out.println("开始：" + fmt.format(new Date()));
+		long begin = System.currentTimeMillis();
+		task.execute();
+		long end = System.currentTimeMillis();
+		System.out.println("结束：" + fmt.format(new Date()));
+		double delta = (end - begin) / 1000.0;
+		System.out.println("耗时：" + delta + "秒");
+		System.out.println("-------------------------------------");
+	}
+}