From bb8f35cfef9c941da2c7ec1c9ce9145362a7cf2d Mon Sep 17 00:00:00 2001
From: zeekling <lingzhaohui@zeekling.cn>
Date: Tue, 2 Jun 2020 22:48:27 +0800
Subject: [PATCH] =?UTF-8?q?=E5=A2=9E=E5=8A=A0=E9=9D=A2=E8=AF=95=E9=A2=9864?=
 =?UTF-8?q?.=20=E6=B1=821+2+=E2=80=A6+n?=
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---
 src/num/SumNums.java | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 src/num/SumNums.java

diff --git a/src/num/SumNums.java b/src/num/SumNums.java
new file mode 100644
index 0000000..477fa59
--- /dev/null
+++ b/src/num/SumNums.java
@@ -0,0 +1,20 @@
+package num;
+
+/**
+ * @file SumNums.java
+ * @apiNote 求 1+2+...+n ，要求不能使用乘除法、for、while、if、else、switch、case等关键字及条件判断语句（A?B:C）。
+ *       https://leetcode-cn.com/problems/qiu-12n-lcof/
+ * @author zeekling
+ * @version
+ * @date 2020-06-02
+ */
+public class SumNums{
+
+    public int sumNums(int n) {
+        boolean res = n > 0 && (n += sumNums(n-1)) > 0;
+        return n;
+    }
+
+
+}
+