From 4fcc7edb67aeed4cf8eca7619d2534f97accb883 Mon Sep 17 00:00:00 2001
From: Lam Haoyin <root@eatswap.org>
Date: Thu, 17 Mar 2022 21:48:40 +0800
Subject: [PATCH] add: 220317-CN [cpp]

---
 cpp/2203/220317-CN.cpp  | 39 +++++++++++++++++++++++++++++++++++++++
 cpp/2203/CMakeLists.txt |  2 +-
 2 files changed, 40 insertions(+), 1 deletion(-)
 create mode 100644 cpp/2203/220317-CN.cpp

diff --git a/cpp/2203/220317-CN.cpp b/cpp/2203/220317-CN.cpp
new file mode 100644
index 0000000..2286085
--- /dev/null
+++ b/cpp/2203/220317-CN.cpp
@@ -0,0 +1,39 @@
+#include <vector>
+#include <string>
+#include <queue>
+#include <unordered_set>
+#include <iostream>
+
+class Solution {
+public:
+	static std::string longestWord(const std::vector<std::string>& words) {
+		std::unordered_set<std::string> s(words.begin(), words.end());
+		std::string ans = "";
+		int ansLen = 0;
+
+		std::queue<std::string> q;
+		q.push("");
+		while (!q.empty()) {
+			std::string x = q.front();
+			q.pop();
+			int xLen = x.length();
+			for (char c = 'a'; c <= 'z'; ++c) {
+				std::string nx = x + c;
+				if (s.count(nx)) {
+					if (nx.length() > ansLen) {
+						ans = nx;
+						ansLen = nx.length();
+					}
+					q.push(nx);
+				}
+			}
+		}
+
+		return ans;
+	}
+};
+
+int main() {
+	std::cout << Solution::longestWord({"a","banana","app","appl","ap","apply","apple"});
+	return 0;
+}
diff --git a/cpp/2203/CMakeLists.txt b/cpp/2203/CMakeLists.txt
index 44a1aae..0630a05 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 220317.cpp)
+ADD_EXECUTABLE(2203 220317-CN.cpp)