Sort an array of strings according to string lengths

We are given an array of strings, we need to sort the array in increasing order of string lengths.

Examples:

Input : {"GeeksforGeeeks", "I", "from", "am"}
Output : I am from GeeksforGeeks

Input :  {"You", "are", "beautiful", "looking"}
Output : You are looking beautiful



A simple solution is to write our own sort function that compares string lengths to decide which string should come first. Below is the implementation that uses Insertion Sort to sort the array.

C++

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// C++ program to sort an Array of 
// Strings according to their lengths
#include<iostream>
using namespace std;
  
// Function to print the sorted array of string
void printArraystring(string,int);
  
// Function to Sort the array of string
// according to lengths. This function 
// implements Insertion Sort. 
void sort(string s[], int n)
{
    for (int i=1 ;i<n; i++)
    {
        string temp = s[i];
  
        // Insert s[j] at its correct position
        int j = i - 1;
        while (j >= 0 && temp.length() < s[j].length())
        {
            s[j+1] = s[j];
            j--;
        }
        s[j+1] = temp;
    }
}
   
// Function to print the sorted array of string
void printArraystring(string str[], int n)
{
    for (int i=0; i<n; i++)
        cout << str[i] << " ";
}
  
// Driver function
int main()
{
    string arr[] = {"GeeksforGeeks", "I", "from", "am"};
    int n = sizeof(arr)/sizeof(arr[0]);
      
    // Function to perform sorting
    sort(arr, n);
  
    // Calling the function to print result
    printArraystring(arr, n);
      
    return 0;
}

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Java

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// Java program to sort an Array of 
// Strings according to their lengths
import java.util.*;
  
class solution
{
  
// Function to print the sorted array of string
// void printArraystring(string,int);
  
// Function to Sort the array of string
// according to lengths. This function 
// implements Insertion Sort. 
static void sort(String []s, int n)
{
    for (int i=1 ;i<n; i++)
    {
        String temp = s[i];
  
        // Insert s[j] at its correct position
        int j = i - 1;
        while (j >= 0 && temp.length() < s[j].length())
        {
            s[j+1] = s[j];
            j--;
        }
        s[j+1] = temp;
    }
}
  
// Function to print the sorted array of string
static void printArraystring(String str[], int n)
{
    for (int i=0; i<n; i++)
        System.out.print(str[i]+" ");
}
  
// Driver function
public static void main(String args[])
{
    String []arr = {"GeeksforGeeks", "I", "from", "am"};
    int n = arr.length;
      
    // Function to perform sorting
    sort(arr,n);
    // Calling the function to print result
    printArraystring(arr, n);
      
}
}

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Python3

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# Python3 program to sort an Array of 
# Strings according to their lengths
  
# Function to print the sorted array of string
def printArraystring(string, n):
    for i in range(n):
        print(string[i], end = " ")
  
# Function to Sort the array of string 
# according to lengths. This function 
# implements Insertion Sort.
def sort(s, n):
    for i in range(1, n):
        temp = s[i]
  
        # Insert s[j] at its correct position
        j = i - 1
        while j >= 0 and len(temp) < len(s[j]):
            s[j + 1] = s[j]
            j -= 1
  
        s[j + 1] = temp
  
# Driver code
if __name__ == "__main__":
    arr = ["GeeksforGeeks", "I", "from", "am"]
    n = len(arr)
  
    # Function to perform sorting
    sort(arr, n)
  
    # Calling the function to print result
    printArraystring(arr, n)
  
# This code is contributed by
# sanjeev2552

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C#

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// C# program to sort an Array of 
// Strings according to their lengths
using System;
   
public class solution{
  
    // Function to print the sorted array of string
    // void printArraystring(string,int);
  
    // Function to Sort the array of string
    // according to lengths. This function 
    // implements Insertion Sort. 
    static void sort(String []s, int n)
    {
        for (int i=1 ;i<n; i++)
        {
            String temp = s[i];
  
            // Insert s[j] at its correct position
            int j = i - 1;
            while (j >= 0 && temp.Length < s[j].Length)
            {
                s[j+1] = s[j];
                j--;
            }
            s[j+1] = temp;
        }
    }
  
    // Function to print the sorted array of string
    static void printArraystring(String []str, int n)
    {
        for (int i=0; i<n; i++)
            Console.Write(str[i]+" ");
    }
  
    // Driver function
    public static void Main()
    {
        String []arr = {"GeeksforGeeks", "I", "from", "am"};
        int n = arr.Length;
  
        // Function to perform sorting
        sort(arr,n);
        // Calling the function to print result
        printArraystring(arr, n);
  
    }
}
  
// This code is contributed by Rajput-Ji 

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Output:

 I am from GeeksforGeeks

A better solution is to use sort function provided by programming languages like C++, Java. These functions also allow us to write our own custom comparator. Below is C++ implementation that uses C++ STL Sort function.

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#include <bits/stdc++.h>
using namespace  std;
  
// Function to check the small string
bool compare(string &s1,string &s2)
{
    return s1.size() < s2.size();
}
  
// Function to print the sorted array of string
void printArraystring(string str[], int n)
{
    for (int i=0; i<n; i++)
        cout << str[i] << " ";
}
  
// Driver function
int main()
{
    string arr[] = {"GeeksforGeeks", "I", "from", "am"};
    int n = sizeof(arr)/sizeof(arr[0]);
      
    // Function to perform sorting
    sort(arr, arr+n, compare);
  
    // Calling the function to print result
    printArraystring(arr, n);
      
    return 0;
}

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Output:

 I am from GeeksforGeeks

This article is contributed by Rishabh jain. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

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