res +=pathSum(root->right, sum, tmp); }returnres; }intpathSum(TreeNode* root,intsum){ unordered_map<longlong,longlong> mp; mp[sum] =0;returnpathSum(root, sum, mp); } };
You are given a binary tree in which each node contains an integer value. Find the number of paths that sum to a given value. The path does not need to start or end at the root or a leaf, but it must go downwards (traveling only from parent nodes to child nodes). The tree has ...
packageleetcode.easy;/** * Definition for a binary tree node. public class TreeNode{int val; TreeNode * left; TreeNode right; TreeNode(int x){val = x;}}*/publicclassPathSumIII{intcount=0;privatevoidhelper(TreeNoderoot,intsum){if(root==null){return;}if(root.val==sum){count++;}if...
private int core(HashMap<Integer, Integer> map, TreeNode root, int curSum, int sum){ if(root==null){ return 0; } curSum = curSum + root.val; int res = map.getOrDefault(curSum - sum, 0); map.put(curSum, map.getOrDefault(curSum, 0)+1); res += core(map, root.left, cu...
LeetCode -- Path Sum III分析及实现方法 题目描述: You are given a binary tree in which each node contains an integer value. Find the number of paths that sum to a given value. The path does not need to start or end at the root or a leaf, but it must go downwards (traveling only...
Right != nil && hasPathSum(root.Right, remainSum) { return true } // 左右子结点都不满足题意,返回 false return false } 题目链接: Path Sum: leetcode.com/problems/p 路径总和: leetcode.cn/problems/pa LeetCode 日更第 262 天,感谢阅读至此的你 欢迎点赞、收藏鼓励支持小满...
113.Path Sum II Loading...leetcode.com/problems/path-sum-ii/ 1、 先读题,题目是求从根到叶子node,路径上所有数字之和等于sum 的所有路径。 2、先求出从root 到叶子node,所有路径的二维数组,再判断二维数组中那些元素之和等于sum值。 3、用递归深度优先搜索解决,用一个二维数组统计所有路径,一个一...
题目链接:Path Sum II | LeetCode OJ Given a binary tree and a sum, find all root-to-leaf paths where each path's sum equals the given sum. For example: Given the below binary tree and sum = 22, 5 /\ 48 //\ 11134 /\/\ ...
path(root.left,sum); path(root.right,sum); } } 113. 路径总和 II 给定一个二叉树和一个目标和,找到所有从根节点到叶子节点路径总和等于给定目标和的路径。 说明:叶子节点是指没有子节点的节点。 示例: 给定如下二叉树,以及目标和sum = 22,
1. Description Path Sum III 2. Solution Recursive /** * Definition for a binary tree node. * struct TreeNode { * int val; * TreeNode *left; * TreeNode *right; * TreeNode(int x) : val(x), left(NULL), right(NULL) {}