Sorting an array according to another array using pair in STL

How to sort an Array using STL in C++?

Last Updated : 19 Mar, 2019

Given an array arr[], sort this array using STL in C++. Example:

Input: arr[] = {1, 45, 54, 71, 76, 12}
Output: {1, 12, 45, 54, 71, 76}

Input: arr[] = {1, 7, 5, 4, 6, 12}
Output: {1, 4, 5, 6, 7, 12}

Approach: Sorting can be done with the help of sort() function provided in STL. Syntax:

sort(arr, arr + n);

CPP

// C++ program to sort Array
// using sort() in STL

#include <bits/stdc++.h>
using namespace std;

int main()
{

    // Get the array
    int arr[] = { 1, 45, 54, 71, 76, 12 };

    // Find the size of the array
    int n = sizeof(arr) / sizeof(arr[0]);

    // Print the array
    cout << "Array: ";
    for (int i = 0; i < n; i++)
        cout << arr[i] << " ";
    cout << endl;

    // Sort the array
    sort(arr, arr + n);

    // Print the sorted array
    cout << "Sorted Array: ";
    for (int i = 0; i < n; i++)
        cout << arr[i] << " ";
    cout << endl;

    return 0;
}

Output:

Array: 1 45 54 71 76 12 
Sorted Array: 1 12 45 54 71 76

Sorting an array according to another array using pair in STL

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