From 761469af167a14e4119ef8935867eeb2926e3404 Mon Sep 17 00:00:00 2001
From: tphyhFighting <2363176358@qq.com>
Date: Sat, 13 Nov 2021 20:44:39 +0800
Subject: [PATCH 1/3] add: leetcode 0520 solution

---
 leetcode/0520.Detect-Capital/520.Detect Capital.go | 13 +++++++++++++
 1 file changed, 13 insertions(+)
 create mode 100644 leetcode/0520.Detect-Capital/520.Detect Capital.go

diff --git a/leetcode/0520.Detect-Capital/520.Detect Capital.go b/leetcode/0520.Detect-Capital/520.Detect Capital.go
new file mode 100644
index 000000000..c9710484d
--- /dev/null
+++ b/leetcode/0520.Detect-Capital/520.Detect Capital.go	
@@ -0,0 +1,13 @@
+package leetcode
+
+import "strings"
+
+func detectCapitalUse(word string) bool {
+	wLower := strings.ToLower(word)
+	wUpper := strings.ToUpper(word)
+	wCaptial := strings.ToUpper(string(word[0])) + strings.ToLower(string(word[1:]))
+	if wCaptial == word || wLower == word || wUpper == word {
+		return true
+	}
+	return false
+}

From 75d1e15eef1e1772acef1f1e9dcd4092239a55ab Mon Sep 17 00:00:00 2001
From: tphyhFighting <2363176358@qq.com>
Date: Sat, 13 Nov 2021 20:44:54 +0800
Subject: [PATCH 2/3] add: leetcode 0520 test

---
 .../520.Detect Capital_test.go                | 45 +++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 leetcode/0520.Detect-Capital/520.Detect Capital_test.go

diff --git a/leetcode/0520.Detect-Capital/520.Detect Capital_test.go b/leetcode/0520.Detect-Capital/520.Detect Capital_test.go
new file mode 100644
index 000000000..20635849b
--- /dev/null
+++ b/leetcode/0520.Detect-Capital/520.Detect Capital_test.go	
@@ -0,0 +1,45 @@
+package leetcode
+
+import (
+	"fmt"
+	"testing"
+)
+
+type question520 struct {
+	para520
+	ans520
+}
+
+// para 是参数
+type para520 struct {
+	word string
+}
+
+// ans 是答案
+type ans520 struct {
+	ans bool
+}
+
+func Test_Problem520(t *testing.T) {
+
+	qs := []question520{
+
+		{
+			para520{"USA"},
+			ans520{true},
+		},
+
+		{
+			para520{"FlaG"},
+			ans520{false},
+		},
+	}
+
+	fmt.Printf("------------------------Leetcode Problem 520------------------------\n")
+
+	for _, q := range qs {
+		_, p := q.ans520, q.para520
+		fmt.Printf("【input】:%v       【output】:%v\n", p, detectCapitalUse(p.word))
+	}
+	fmt.Printf("\n\n\n")
+}

From 0ef19c8e0b4ee16350e505f0b3c5385bc3269dd6 Mon Sep 17 00:00:00 2001
From: tphyhFighting <2363176358@qq.com>
Date: Sat, 13 Nov 2021 20:45:23 +0800
Subject: [PATCH 3/3] add: leetcode 0520 readme

---
 leetcode/0520.Detect-Capital/README.md | 65 ++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 leetcode/0520.Detect-Capital/README.md

diff --git a/leetcode/0520.Detect-Capital/README.md b/leetcode/0520.Detect-Capital/README.md
new file mode 100644
index 000000000..376ef59a5
--- /dev/null
+++ b/leetcode/0520.Detect-Capital/README.md
@@ -0,0 +1,65 @@
+# [520. Detect Capital](https://leetcode-cn.com/problems/detect-capital/)
+
+
+## 题目
+
+We define the usage of capitals in a word to be right when one of the following cases holds:
+
+All letters in this word are capitals, like "USA".
+
+All letters in this word are not capitals, like "leetcode".
+
+Only the first letter in this word is capital, like "Google".
+
+Given a string word, return true if the usage of capitals in it is right.
+
+**Example 1:**
+
+```
+Input: word = "USA"
+Output: true
+```
+
+**Example 2:**
+
+```
+Input: word = "FlaG"
+Output: false
+```
+
+**Constraints:**
+
+- 1 <= word.length <= 100
+- word consists of lowercase and uppercase English letters.
+
+## 题目大意
+
+我们定义，在以下情况时，单词的大写用法是正确的：
+
+全部字母都是大写，比如 "USA" 。
+单词中所有字母都不是大写，比如 "leetcode" 。
+如果单词不只含有一个字母，只有首字母大写，比如"Google" 。
+
+给你一个字符串 word 。如果大写用法正确，返回 true ；否则，返回 false 。
+
+## 解题思路
+
+- 把word分别转换为全部小写wLower，全部大写wUpper，首字母大写的字符串wCaptial
+- 判断word是否等于wLower,wUpper,wCaptial中的一个，如果是返回true，否则返回false
+
+## 代码
+```go
+package leetcode
+
+import "strings"
+
+func detectCapitalUse(word string) bool {
+	wLower := strings.ToLower(word)
+	wUpper := strings.ToUpper(word)
+	wCaptial := strings.ToUpper(string(word[0])) + strings.ToLower(string(word[1:]))
+	if wCaptial == word || wLower == word || wUpper == word {
+		return true
+	}
+	return false
+}
+```
\ No newline at end of file