# Count the nodes of a tree whose weighted string is an anagram of the given string

Given a tree, and the weights (in the form of strings) of all the nodes, the task is to count the nodes whose weighted string is an anagram with the given string **str**.

**Examples:**

Input:

str = “geek”

Output:2

Only the weighted strings of the nodes 2 and 6

are anagrams of the given string “geek”.

**Approach:** Perform dfs on the tree and for every node, check if it’s weighted string is anagram with the given string or not, If not then increment the count.

Below is the implementation of the above approach:

`// C++ implementation of the approach ` `#include <bits/stdc++.h> ` `using` `namespace` `std; ` ` ` `string s; ` `int` `cnt = 0; ` ` ` `vector<` `int` `> graph[100]; ` `vector<string> weight(100); ` ` ` `// Function that return true if both ` `// the strings are anagram of each other ` `bool` `anagram(string x, string s) ` `{ ` ` ` `sort(x.begin(), x.end()); ` ` ` `sort(s.begin(), s.end()); ` ` ` `if` `(x == s) ` ` ` `return` `true` `; ` ` ` `else` ` ` `return` `false` `; ` `} ` ` ` `// Function to perform dfs ` `void` `dfs(` `int` `node, ` `int` `parent) ` `{ ` ` ` `// If current node's weighted ` ` ` `// string is an anagram of ` ` ` `// the given string s ` ` ` `if` `(anagram(weight[node], s)) ` ` ` `cnt += 1; ` ` ` ` ` `for` `(` `int` `to : graph[node]) { ` ` ` `if` `(to == parent) ` ` ` `continue` `; ` ` ` `dfs(to, node); ` ` ` `} ` `} ` ` ` `// Driver code ` `int` `main() ` `{ ` ` ` `s = ` `"geek"` `; ` ` ` ` ` `// Weights of the nodes ` ` ` `weight[1] = ` `"eeggk"` `; ` ` ` `weight[2] = ` `"geek"` `; ` ` ` `weight[3] = ` `"gekrt"` `; ` ` ` `weight[4] = ` `"tree"` `; ` ` ` `weight[5] = ` `"eetr"` `; ` ` ` `weight[6] = ` `"egek"` `; ` ` ` ` ` `// Edges of the tree ` ` ` `graph[1].push_back(2); ` ` ` `graph[2].push_back(3); ` ` ` `graph[2].push_back(4); ` ` ` `graph[1].push_back(5); ` ` ` `graph[5].push_back(6); ` ` ` ` ` `dfs(1, 1); ` ` ` ` ` `cout << cnt; ` ` ` ` ` `return` `0; ` `} ` |

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**Output:**

2

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