From 1404dd79cc2cbf02efe0a84b549ec9ae82aac2f9 Mon Sep 17 00:00:00 2001
From: Eat-Swap <root@eatswap.org>
Date: Mon, 20 Jun 2022 00:54:04 +0800
Subject: [PATCH] add: 220619

---
 cpp/2206/220619.cpp     | 83 +++++++++++++++++++++++++++++++++++++++++
 cpp/2206/CMakeLists.txt |  2 +-
 2 files changed, 84 insertions(+), 1 deletion(-)
 create mode 100644 cpp/2206/220619.cpp

diff --git a/cpp/2206/220619.cpp b/cpp/2206/220619.cpp
new file mode 100644
index 0000000..0687c1f
--- /dev/null
+++ b/cpp/2206/220619.cpp
@@ -0,0 +1,83 @@
+#include <functional>
+#include <vector>
+#include <string>
+#include <bitset>
+
+/**
+ * 1268. Search Suggestions System
+ * You are given an array of strings products and a string searchWord.
+ * Design a system that suggests at most three product names from products after each character of searchWord is typed. Suggested products should have common prefix with searchWord. If there are more than three products with a common prefix return the three lexicographically minimums products.
+ * Return a list of lists of the suggested products after each character of searchWord is typed.
+ */
+
+class Solution {
+private:
+	int nodes[20008][26]{};
+	std::bitset<20008> terminate;
+	int cnt = 1;
+
+	static constexpr inline int id(char c) { return c - 'a'; }
+
+	void insert(const std::string& s) {
+		int u = 0;
+		for (char ch : s) {
+			int c = id(ch);
+			if (!nodes[u][c])
+				nodes[u][c] = cnt++;
+			u = nodes[u][c];
+		}
+		terminate.set(u);
+	}
+
+	std::vector<std::string> m[20008];
+
+public:
+	std::vector<std::vector<std::string>> suggestedProducts(const std::vector<std::string>& products, const std::string& searchWord) {
+		if (searchWord.empty())
+			return {};
+		for (const std::string& s : products)
+			insert(s);
+		std::string buffer {searchWord.front()};
+		buffer.reserve(3072);
+		std::function<void(int)> dfs = [&](int u) {
+			if (terminate.test(u))
+				m[u].push_back(buffer);
+			for (int i = 0; i < 26; ++i) {
+				if (!nodes[u][i])
+					continue;
+				buffer.push_back(i + 'a');
+
+				dfs(nodes[u][i]);
+				m[u].insert(m[u].end(), m[nodes[u][i]].begin(), m[nodes[u][i]].end());
+
+				buffer.pop_back();
+			}
+		};
+
+		if (!nodes[0][id(searchWord.front())])
+			return {searchWord.length(), std::vector<std::string>()};
+		dfs(nodes[0][id(searchWord.front())]);
+		int u = 0;
+		std::vector<std::vector<std::string>> ret;
+		for (char ch : searchWord) {
+			if (!nodes[u][id(ch)]) {
+				while (ret.size() < searchWord.length())
+					ret.emplace_back();
+				return ret;
+			}
+			u = nodes[u][id(ch)];
+			if (m[u].size() > 3) {
+				ret.push_back({m[u][0], m[u][1], m[u][2]});
+			} else {
+				ret.push_back(m[u]);
+			}
+		}
+		return ret;
+	}
+};
+
+int main() {
+	auto* s = new Solution();
+	auto r = s->suggestedProducts({"mobile","mouse","moneypot","monitor","mousepad"}, "mouse");
+	return 0;
+}
diff --git a/cpp/2206/CMakeLists.txt b/cpp/2206/CMakeLists.txt
index 4ac96ac..5906648 100644
--- a/cpp/2206/CMakeLists.txt
+++ b/cpp/2206/CMakeLists.txt
@@ -3,4 +3,4 @@ PROJECT(2206)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2206 220618.cpp)
+ADD_EXECUTABLE(2206 220619.cpp)