提交内容：

shengexing · shengexing · commit fb7c529687be · 2020-03-17T23:32:23.000+08:00
01-4.2 练习题
diff --git a/AlgorithmDiagram9787115447630/Chapter04/c04_1_1_sum/countArray.py b/AlgorithmDiagram9787115447630/Chapter04/c04_1_1_sum/countArray.py
@@ -0,0 +1,13 @@
+""" 列表元素求总数 """
+
+
+# 对列表元素求总数
+def countArray(num):
+    if num:
+        num.pop()
+        return 1 + countArray(num)
+    else:
+        return 0
+
+
+print(countArray([1, 2, 3, 4, 5, 6]))
diff --git a/AlgorithmDiagram9787115447630/Chapter04/c04_1_1_sum/maxArray.py b/AlgorithmDiagram9787115447630/Chapter04/c04_1_1_sum/maxArray.py
@@ -0,0 +1,14 @@
+""" 列表元素找最大数 """
+
+
+# 对列表元素求最大值
+def maxArray(num):
+    temp0 = num.pop()
+    if num:
+        temp1 = maxArray(num)
+        if temp0 < temp1:
+            return temp1
+    return temp0
+
+
+print(maxArray([1, 2, 3, 4, 5, 6]))
diff --git a/AlgorithmDiagram9787115447630/Chapter04/c04_1_1_sum/sumArray.py b/AlgorithmDiagram9787115447630/Chapter04/c04_1_1_sum/sumArray.py
@@ -0,0 +1,12 @@
+""" 数组元素求和 """
+
+
+# 对数组中所用元素求和
+def sumArray(num):
+    if len(num) == 0:
+        return 0
+    else:
+        return num.pop() + sumArray(num)
+
+
+print(sumArray([1, 2, 3, 4, 5, 6]))
