From b63a62fad18d50327b580bfd271f0594e89cf065 Mon Sep 17 00:00:00 2001
From: zhuyijun <zhuyijun1317453947@outlook.com>
Date: Sun, 14 Nov 2021 16:37:17 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0bfs?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .vscode/settings.json |  3 +-
 bfs/111.cpp           | 61 ++++++++++++++++++++++++++++++++++
 bfs/752.cpp           | 76 +++++++++++++++++++++++++++++++++++++++++++
 recall/46.cpp         |  1 +
 4 files changed, 140 insertions(+), 1 deletion(-)
 create mode 100644 bfs/111.cpp
 create mode 100644 bfs/752.cpp

diff --git a/.vscode/settings.json b/.vscode/settings.json
index dbbd2cb..bb2c08c 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -85,6 +85,7 @@
         "barrier": "cpp",
         "latch": "cpp",
         "semaphore": "cpp",
-        "syncstream": "cpp"
+        "syncstream": "cpp",
+        "queue": "cpp"
     }
 }
\ No newline at end of file
diff --git a/bfs/111.cpp b/bfs/111.cpp
new file mode 100644
index 0000000..04c58f3
--- /dev/null
+++ b/bfs/111.cpp
@@ -0,0 +1,61 @@
+/*
+ * @Description:
+ * @Version: 1.0
+ * @Autor: zhuyijun
+ * @Date: 2021-11-13 16:39:27
+ * @LastEditTime: 2021-11-14 15:11:24
+ */
+/*
+
+给定一个二叉树，找出其最小深度。
+最小深度是从根节点到最近叶子节点的最短路径上的节点数量。
+说明：叶子节点是指没有子节点的节点。
+示例 1：
+
+输入：root = [3,9,20,null,null,15,7]
+输出：2
+示例 2：
+
+输入：root = [2,null,3,null,4,null,5,null,6]
+输出：5
+*/
+#include <bits/stdc++.h>
+using namespace std;
+struct TreeNode {
+  int val;
+  TreeNode *left;
+  TreeNode *right;
+  TreeNode() : val(0), left(nullptr), right(nullptr) {}
+  TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}
+  TreeNode(int x, TreeNode *left, TreeNode *right)
+      : val(x), left(left), right(right) {}
+};
+int minDepth(TreeNode *root) {
+  if (root == nullptr) {
+    return 0;
+  }
+  queue<TreeNode> q;
+  q.push(*root);
+  int depth = 1;
+  while (!q.empty()) {
+    int sz = q.size();
+    for (int i = 0; i < sz; i++) {
+      //获取队列第一位元素
+      TreeNode cur = q.front();
+      //移除队列中第一位元素
+      q.pop();
+      if (cur.left == nullptr && cur.right == nullptr) {
+        return depth;
+      }
+      if (cur.left != nullptr) {
+        q.push(*cur.left);
+      }
+      if (cur.right != nullptr) {
+        q.push(*cur.right);
+      }
+    }
+    depth++;
+  }
+  return depth;
+}
+int main() { return 0; }
\ No newline at end of file
diff --git a/bfs/752.cpp b/bfs/752.cpp
new file mode 100644
index 0000000..27e9c47
--- /dev/null
+++ b/bfs/752.cpp
@@ -0,0 +1,76 @@
+/*
+ * @Description:
+ * @Version: 1.0
+ * @Autor: zhuyijun
+ * @Date: 2021-11-14 15:33:16
+ * @LastEditTime: 2021-11-14 16:30:35
+ */
+#include <bits/stdc++.h>
+using namespace std;
+string plusOne(string s, int j) {
+  if (s[j] == '9') {
+    s[j] = '0';
+  } else {
+    s[j] += 1;
+  }
+  return s;
+}
+
+string minusOne(string s, int j) {
+  if (s[j] == '0') {
+    s[j] = '9';
+  } else {
+    s[j] -= 1;
+  }
+  return s;
+}
+int openLock(vector<string>& deadends, string target) {
+  set<string> deads;
+  deads.insert(deadends.begin(), deadends.end());
+  //   for (string s : deadends) {
+  //     deads.insert(s);
+  //   }
+  //记录已经穷举过得密码，防止走回头路
+  set<string> visited;
+  int step = 0;
+  queue<string> q;
+  q.push("0000");
+  visited.insert("0000");
+  while (!q.empty()) {
+    int sz = q.size();
+    for (int i = 0; i < sz; i++) {
+      string cur = q.front();
+      q.pop();
+      cout << cur << endl;
+      //判断是否达到终点
+      if (deads.find(cur) != deads.end()) {
+        continue;
+      }
+      if (cur == target) {
+        return step;
+      }
+
+      for (int j = 0; j < 4; j++) {
+        string up = plusOne(cur, j);
+        if (visited.find(up) == visited.end()) {
+          q.push(up);
+          visited.insert(up);
+        }
+        string down = minusOne(cur, j);
+        if (visited.find(down) == visited.end()) {
+          q.push(down);
+          visited.insert(down);
+        }
+      }
+    }
+    //增加步数
+    step++;
+  }
+  return -1;
+}
+int main() {
+  vector<string> deadends{"0201", "0101", "0102", "1212", "2002"};
+  string s = "0202";
+  cout << openLock(deadends, s);
+  return 0;
+}
\ No newline at end of file
diff --git a/recall/46.cpp b/recall/46.cpp
index 49708c7..2ed414d 100644
--- a/recall/46.cpp
+++ b/recall/46.cpp
@@ -60,6 +60,7 @@ vector<vector<int>> permute(vector<int>& nums) {
 }
 
 //测试
+
 int main() {
   vector<int> nums;
   nums.push_back(1);