Selection Sort

• Time : O(n^2)
• Space : O(1)

vector<int> selectionSort(vector<int> array) {
    int n = array.size();
    for(int i = 0; i < n; i++) {
        int mi = array[i], idx = i;
        for(int j = i; j < n; j++) {
            if(mi > array[j]) {
                mi = array[j], idx = j;
            }
        }
        swap(array[i], array[idx]);
    }
    
    return array;
}