Weighted Prefix Search - GeeksforGeeks


Weighted Prefix Search - GeeksforGeeks
Given n strings and a weight associated with each string. The task is to find the maximum weight of string having the given prefix. Print “-1” if no string is present with given prefix.
Examples:


Input : 
s1 = "geeks", w1 = 15
s2 = "geeksfor", w2 = 30
s3 = "geeksforgeeks", w3 = 45
prefix = geek
Output : 45

All the string contain the given prefix, but
maximum weight of string is 45 among all.

    static class TrieNode
    {
        // children
        TrieNode[] children = new TrieNode[26];
       
        // To store weight of string.
        int weight;
          
        // constructor
        public TrieNode() {
            weight = Integer.MIN_VALUE;
            for (int i = 0; i < 26; i++)
                children[i] = null;
        }
    }
    //static TrieNode root;
      
    // Inserting the node in the Trie.
    static TrieNode insert(String str, int wt, int idx, TrieNode root)
    {
        int cur = str.charAt(idx) - 'a';
       
        if (root.children[cur] == null)
            root.children[cur] = new TrieNode();
       
        // Assigning the maximum weight
        root.children[cur].weight =
                      Math.max(root.children[cur].weight, wt);
       
        if (idx + 1 != str.length())
            root.children[cur] =
               insert(str, wt, idx + 1, root.children[cur]);
       
        return root;
    }
       
    // Search and return the maximum weight.
    static int searchMaximum(String prefix, TrieNode root)
    {
        int idx = 0, ans = -1;
        int n = prefix.length();
       
        // Searching the prefix in TRie.
        while (idx < n)
        {
            int cur = prefix.charAt(idx) - 'a';
       
            // If prefix not found return -1.
            if (root.children[cur] == null)
                return -1;
       
            ans = root.children[cur].weight;
            root = root.children[cur];
            ++idx;
        }
       
        return ans;
    }
       
    // Return the maximum weight of string having given prefix.
    static int maxWeight(String str[], int weight[], int n,
                                           String prefix)
    {
        TrieNode root = new TrieNode();
       
        // Inserting all string in the Trie.
        for (int i = 0; i < n; i++)
            root = insert(str[i], weight[i], 0, root);
       
        return searchMaximum(prefix, root);
       
    }

Method 1: (Brute Force)
Check all the string for given prefix, if string contains the prefix, compare its weight with maximum value so far.

Read full article from Weighted Prefix Search - GeeksforGeeks

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