From cb2fea63e7f5e616f697a715b9d523b6ba877308 Mon Sep 17 00:00:00 2001
From: unknown <gpan20020205@gmail.com>
Date: Wed, 11 May 2022 09:50:47 +0100
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=200113.=E8=B7=AF=E5=BE=84?=
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---
 problems/0112.路径总和.md | 65 ++++++++++++++++++++++++++++++++++-
 1 file changed, 64 insertions(+), 1 deletion(-)

diff --git a/problems/0112.路径总和.md b/problems/0112.路径总和.md
index 6433996c..de155b45 100644
--- a/problems/0112.路径总和.md
+++ b/problems/0112.路径总和.md
@@ -1007,7 +1007,7 @@ func traversal(_ cur: TreeNode?, count: Int) {
 ```
 
 ## C
-0112.路径总和
+> 0112.路径总和
 递归法：
 ```c
 bool hasPathSum(struct TreeNode* root, int targetSum){
@@ -1062,6 +1062,69 @@ bool hasPathSum(struct TreeNode* root, int targetSum){
     return false;
 }
 ```
+> 0113.路径总和 II
+```c
+int** ret;
+int* path;
+int* colSize;
+int retTop;
+int pathTop;
+
+void traversal(const struct TreeNode* const node, int count) {
+    // 若当前节点为叶子节点
+    if(!node->right && !node->left) {
+        // 若当前path上的节点值总和等于targetSum。
+        if(count == 0) {
+            // 复制当前path
+            int *curPath = (int*)malloc(sizeof(int) * pathTop);
+            memcpy(curPath, path, sizeof(int) * pathTop);
+            // 记录当前path的长度为pathTop
+            colSize[retTop] = pathTop;
+            // 将当前path加入到ret数组中
+            ret[retTop++] = curPath;
+        }
+        return;
+    }
+
+    // 若节点有左/右孩子
+    if(node->left) {
+        // 将左孩子的值加入path中
+        path[pathTop++] = node->left->val;
+        traversal(node->left, count - node->left->val);
+        // 回溯
+        pathTop--;
+    }
+    if(node->right) {
+        // 将右孩子的值加入path中
+        path[pathTop++] = node->right->val;
+        traversal(node->right, count - node->right->val);
+        // 回溯
+        --pathTop;
+    }
+}
+
+int** pathSum(struct TreeNode* root, int targetSum, int* returnSize, int** returnColumnSizes){
+    // 初始化数组
+    ret = (int**)malloc(sizeof(int*) * 1000);
+    path = (int*)malloc(sizeof(int*) * 1000);
+    colSize = (int*)malloc(sizeof(int) * 1000);
+    retTop = pathTop = 0;
+    *returnSize = 0;
+
+    // 若根节点不存在，返回空的ret
+    if(!root)
+        return ret;
+    // 将根节点加入到path中
+    path[pathTop++] = root->val;
+    traversal(root, targetSum - root->val);
+
+    // 设置返回ret数组大小，以及其中每个一维数组元素的长度
+    *returnSize = retTop;
+    *returnColumnSizes = colSize;
+
+    return ret;
+}
+```