From 185ef9fcb0e59f13e9ee0ccb261693cdaddebab0 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Tue, 23 Feb 2021 21:07:19 +0800
Subject: import(solutions): Move leetcode solutions to subdir.

---
 works/solutions/leetcode/cpp/526.cpp | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 works/solutions/leetcode/cpp/526.cpp

(limited to 'works/solutions/leetcode/cpp/526.cpp')

diff --git a/works/solutions/leetcode/cpp/526.cpp b/works/solutions/leetcode/cpp/526.cpp
new file mode 100644
index 0000000..19f445f
--- /dev/null
+++ b/works/solutions/leetcode/cpp/526.cpp
@@ -0,0 +1,29 @@
+#include <vector>
+
+using std::vector;
+
+class Solution {
+public:
+  void dfs(int N, int index, bool *num_used, int &result) {
+    if (index > N) {
+      result += 1;
+      return;
+    }
+
+    for (int num = 1; num <= N; num++) {
+      if (!num_used[num] && (num % index == 0 || index % num == 0)) {
+        num_used[num] = true;
+        dfs(N, index + 1, num_used, result);
+        num_used[num] = false;
+      }
+    }
+  }
+
+  int countArrangement(int N) {
+    bool *num_used = new bool[N + 1]{false};
+    int result = 0;
+    dfs(N, 1, num_used, result);
+    delete[] num_used;
+    return result;
+  }
+};
-- 
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