Selection Sort

Selection sort is a simple sorting algorithm that sorts an array by repeatedly finding the minimum element from the unsorted part of the array and placing it at the beginning of the sorted part. This process is repeated until the entire array is sorted. It is an in-place comparison sort and has a time complexity of O(n^2).

Here’s an example code for Selection Sort in C++:

void selectionSort(int arr[], int n) {
    int i, j, minIndex;

    for (i = 0; i < n-1; i++) {
        minIndex = i;
        for (j = i+1; j < n; j++) {
            if (arr[j] < arr[minIndex]) {
                minIndex = j;
            }
        }
        // swap the minimum element with the first element of the unsorted part
        int temp = arr[minIndex];
        arr[minIndex] = arr[i];
        arr[i] = temp;
    }
}

In this code, arr is the array to be sorted and n is its size. The outer loop runs n-1 times and selects the minimum element from the unsorted part of the array in each iteration. The inner loop runs from i+1 to n-1 and compares each element with the current minimum element. If an element smaller than the minimum element is found, its index is stored in minIndex. At the end of each iteration of the outer loop, the minimum element is swapped with the first element of the unsorted part of the array.

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