vault backup: 2022-05-20 12:07:56

数据结构与算法之美/算法之美 - 动态规划.md

@@ -1,3 +1,33 @@
 >大问题拆解为小问题，逐级向下拆解
 
-## 用循环实现斐波那契数列
+## 用循环实现斐波那契数列
+
+```javascript
+const Fibonacci_Cycle = (n: number): number => {
+	if (n <= 0) return 0;
+	if (n === 1) return n;
+
+	let n1 = -1;
+	let n2 = -1;
+	let n3 = 0;
+
+	for (let index = 0; index <= n; index++) {
+		if (index === 0) {
+			n1 = 0;
+			n2 = 0;
+			continue;
+		}
+		if (index === 1) {
+			n1 = 0;
+			n2 = 1;
+			continue;
+		}
+
+		n3 = n1 + n2;
+		n1 = n2;
+		n2 = n3;
+	}
+	
+	return n3;
+};
+```