Group Anagrams

Medium 30 pts New · no attempts yet csharp

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Group Anagrams — Fiserv interview prep · Arrays & Hashing

Classic interview problem #49.

Input (stdin)

Line 1: n\nNext n lines: strings

Output (stdout)

Number of anagram groups

Your program must read from stdin and write the answer to stdout (no extra debug text).

Examples

Sample

Input

6
eat
tea
tan
ate
nat
bat

Output

Static hints

Input format: Line 1: n\nNext n lines: strings
DSA Interview 150 — Arrays & Hashing
Problem #49
Frequently asked at Fiserv
Arrays & Hashing

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Your solution

Editor is open — no login wall to practice.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

class Program
{
    static int[] Ria(string line = null)
    {
        line ??= Console.ReadLine();
        if (string.IsNullOrWhiteSpace(line)) return Array.Empty<int>();
        return line.Trim().Split(new[] { ' ', ',', '\t' }, StringSplitOptions.RemoveEmptyEntries)
            .Select(int.Parse).ToArray();
    }
    static string[] Rsa()
    {
        int n = int.Parse(Console.ReadLine());
        var arr = new string[n];
        for (int i = 0; i < n; i++) arr[i] = Console.ReadLine();
        return arr;
    }
    static void W(params object[] parts) => Console.WriteLine(string.Join(" ", parts));
    static void Wb(bool v) => Console.WriteLine(v ? "true" : "false");
    static void Wi(int v) => Console.WriteLine(v);
    static void Ws(string v) => Console.WriteLine(v);

static void Main()
    {
        // Read from stdin (see problem statement for format)
        // Line 1: n\nNext n lines: strings

}
}

Ready — edit the code above and click Run or Submit.

Official solution

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

class Program
{
    static int[] Ria(string line = null)
    {
        line ??= Console.ReadLine();
        if (string.IsNullOrWhiteSpace(line)) return Array.Empty<int>();
        return line.Trim().Split(new[] { ' ', ',', '\t' }, StringSplitOptions.RemoveEmptyEntries)
            .Select(int.Parse).ToArray();
    }
    static string[] Rsa()
    {
        int n = int.Parse(Console.ReadLine());
        var arr = new string[n];
        for (int i = 0; i < n; i++) arr[i] = Console.ReadLine();
        return arr;
    }
    static void W(params object[] parts) => Console.WriteLine(string.Join(" ", parts));
    static void Wb(bool v) => Console.WriteLine(v ? "true" : "false");
    static void Wi(int v) => Console.WriteLine(v);
    static void Ws(string v) => Console.WriteLine(v);

    static void Main()
    {
int n = int.Parse(Console.ReadLine());
var strs = new string[n];
for (int i = 0; i < n; i++) strs[i] = Console.ReadLine();
var groups = new Dictionary<string, List<string>>();
foreach (var w in strs) {
    var key = new string(w.OrderBy(c => c).ToArray());
    if (!groups.ContainsKey(key)) groups[key] = new List<string>();
    groups[key].Add(w);
}
Wi(groups.Count);
    }
}

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Explanation

Step 1 / 1

Fiserv interview context: Group Anagrams is a Medium Arrays & Hashing problem — Use a hash map to trade space for O(1) lookups — classic at onsite rounds.

Use the animation above to step through each move before writing code.

Pattern: Arrays & Hashing

Read from stdin, write to stdout. Classic interview problem #49.

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