From 6cfc7529fd9c314c3e50378b3693e602406aff21 Mon Sep 17 00:00:00 2001
From: Lam Haoyin <root@eatswap.org>
Date: Mon, 7 Mar 2022 07:51:15 +0800
Subject: [PATCH] add: 220307-CN [cpp]

---
 cpp/2203/220307-CN.cpp  | 23 +++++++++++++++++++++++
 cpp/2203/CMakeLists.txt |  2 +-
 2 files changed, 24 insertions(+), 1 deletion(-)
 create mode 100644 cpp/2203/220307-CN.cpp

diff --git a/cpp/2203/220307-CN.cpp b/cpp/2203/220307-CN.cpp
new file mode 100644
index 0000000..315a35a
--- /dev/null
+++ b/cpp/2203/220307-CN.cpp
@@ -0,0 +1,23 @@
+#include <string>
+
+/**
+ * 504. Base 7
+ * Given an integer num, return a string of its base 7 representation.
+ */
+
+class Solution {
+public:
+	static std::string convertToBase7(int num) {
+		bool isNeg = num < 0;
+		std::string ret;
+		num = num < 0 ? -num : num;
+		while (num) {
+			ret.push_back('0' + num % 7);
+			num /= 7;
+		}
+		if (isNeg)
+			ret.push_back('-');
+		std::reverse(ret.begin(), ret.end());
+		return ret.empty() ? "0" : ret;
+	}
+};
diff --git a/cpp/2203/CMakeLists.txt b/cpp/2203/CMakeLists.txt
index 3b7275a..4ef520e 100644
--- a/cpp/2203/CMakeLists.txt
+++ b/cpp/2203/CMakeLists.txt
@@ -3,4 +3,4 @@ PROJECT(2203)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2203 220306.cpp)
+ADD_EXECUTABLE(2203 220307-CN.cpp)