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0979-distribute-coins-in-binary-tree/0979-distribute-coins-in-binary-tree.cpp

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+/**
+ * Definition for a binary tree node.
+ * 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) {}
+ * };
+ */
+class Solution {
+public:
+
+    int traverse(TreeNode* r, int &moves) {
+
+        if (r == NULL)
+          return 0;
+
+        int left = traverse(r->left, moves);
+        int right = traverse(r->right, moves);
+        moves += abs(left) + abs(right);
+        return r->val + left + right - 1;
+    }
+
+    int distributeCoins(TreeNode* r, int moves = 0) {
+        traverse(r, moves);
+        return moves;
+    }
+};