Selection sort (sắp xếp chọn)

1def selection_sort(a):2    n = len(a)3    for i in range(n - 1):4        # Find the smallest element in the unsorted tail5        min_idx = i6        for j in range(i + 1, n):7            if a[j] < a[min_idx]:8                min_idx = j9        a[i], a[min_idx] = a[min_idx], a[i]10    return a11
12
13nums = [64, 25, 12, 22, 11]14print("Before:", nums)15selection_sort(nums)16print("After: ", nums)

1function selectionSort(a) {2    for (let i = 0; i < a.length - 1; i++) {3        let min = i;4        // Find the smallest element in the unsorted tail5        for (let j = i + 1; j < a.length; j++) {6            if (a[j] < a[min]) min = j;7        }8        if (min !== i) [a[i], a[min]] = [a[min], a[i]];9    }10    return a;11}12
13const data = [5, 2, 9, 1, 7, 3];14console.log("Before:", data);15console.log("Sorted:", selectionSort([...data]));

1import java.util.Arrays;2
3public class Main {4    static void selectionSort(int[] arr) {5        for (int i = 0; i < arr.length - 1; i++) {6            int minIndex = i;7            // Find the smallest value in the unsorted part8            for (int j = i + 1; j < arr.length; j++) {9                if (arr[j] < arr[minIndex]) minIndex = j;10            }11            int tmp = arr[i];12            arr[i] = arr[minIndex];13            arr[minIndex] = tmp;14        }15    }16
17    public static void main(String[] args) {18        int[] arr = {29, 10, 14, 37, 13, 5};19        System.out.println("Before: " + Arrays.toString(arr));20        selectionSort(arr);21        System.out.println("After:  " + Arrays.toString(arr));22    }23}

1#include <iostream>2#include <utility>3#include <vector>4
5void printVec(const std::vector<int>& a) {6    for (int x : a) std::cout << x << " ";7    std::cout << "\n";8}9
10void selectionSort(std::vector<int>& a) {11    for (size_t i = 0; i + 1 < a.size(); ++i) {12        // Find the smallest element in the unsorted suffix13        size_t minIdx = i;14        for (size_t j = i + 1; j < a.size(); ++j) {15            if (a[j] < a[minIdx]) minIdx = j;16        }17        std::swap(a[i], a[minIdx]);18    }19}20
21int main() {22    std::vector<int> data = {29, 10, 14, 37, 13, 5};23    std::cout << "Before: ";24    printVec(data);25    selectionSort(data);26    std::cout << "After:  ";27    printVec(data);28    return 0;29}

1#include <stdio.h>2
3void printArr(const int a[], int n) {4    for (int i = 0; i < n; i++) printf("%d ", a[i]);5    printf("\n");6}7
8void selectionSort(int a[], int n) {9    for (int i = 0; i < n - 1; i++) {10        // Find the smallest element in the unsorted suffix11        int minIdx = i;12        for (int j = i + 1; j < n; j++) {13            if (a[j] < a[minIdx]) minIdx = j;14        }15        int tmp = a[i];16        a[i] = a[minIdx];17        a[minIdx] = tmp;18    }19}20
21int main(void) {22    int data[] = {29, 10, 14, 37, 13, 5};23    int n = sizeof(data) / sizeof(data[0]);24    printf("Before: ");25    printArr(data, n);26    selectionSort(data, n);27    printf("After:  ");28    printArr(data, n);29    return 0;30}

1DECLARE nums : ARRAY[1:7] OF INTEGER2DECLARE n : INTEGER3n ← 74nums[1] ← 75nums[2] ← 36nums[3] ← 97nums[4] ← 18nums[5] ← 59nums[6] ← 810nums[7] ← 211DECLARE i : INTEGER12DECLARE j : INTEGER13DECLARE minIndex : INTEGER14DECLARE temp : INTEGER15
16// Select the smallest remaining value and swap it into place17FOR i ← 1 TO n - 118    minIndex ← i19    FOR j ← i + 1 TO n20        IF nums[j] < nums[minIndex] THEN21            minIndex ← j22        ENDIF23    NEXT j24    IF minIndex <> i THEN25        temp ← nums[i]26        nums[i] ← nums[minIndex]27        nums[minIndex] ← temp28    ENDIF29NEXT i30
31FOR i ← 1 TO n32    OUTPUT nums[i]33NEXT i