C:

void insert(int *B, int size, int val)
{
    if (size == 1)
        B[0] = val;
    else
    {
        for (int i = 1; i < size; i++)
        {
            if (val <= B[i])
            {
                B[i - 1] = val;
                return;
            }
            else
            {
                B[i 
 
- 1] = B[i];
                B[i] = val;
            }
        }
    }
}

void merge(int *A, int ASize, int m, int *B, int BSize, int n)
{
    if (BSize == 0)
        return;
    int point = 0;
    while (point < m)
    {
        if (A[point] > B[0])
        {
            int temp = A[point];
            A[point] 
 
= B[0];
            insert(B, BSize, temp);
        }
        point++;
    }
    for (int i = m; i < ASize; i++)
        A[i] = B[i - m];
}

　　JAVA:

 public final void merge(int[] A, int m, int[] B, int n) {
        if (n == 0) return;
        int point0 = 0;
        while (point0 < m) {
            
 
if (A[point0] > B[0]) {
                int temp = A[point0];
                A[point0] = B[0];
                insert(B, temp);
            }
            point0++;
        }
        for (int i = m; i < n + m; i++) {
            A[i] = B[i - m];
        }
    }

    private final void insert(int[] arr, int val) {
        if (arr.length == 1) arr[0] = val;
        else {
            for (int i = 1; i < arr.length; i++) {
                if (arr[i] >= val) {
                    arr[i - 1] = val;
                    break;
                }
                arr[i - 1] = arr[i];
                arr[i] = val;
            }
        }
    }

　　JS:

/**
 * @param {number[]} A
 * @param {number} m
 * @param {number[]} B
 * @param {number} n
 * @return {void} Do not return anything, modify A in-place instead.
 */
var merge = function (A, m, B, n) {
    if (n == 0) return;
    let point = 0;
    while (point < m) {
        if (A[point] >= B[0]) {
            let temp = A[point];
            A[point] = B[0];
            insert(B, temp);
        }
        point++;
    }
    for (let i = m; i < m + n; i++) A[i] = B[i - m];
};

var insert = function (arr, val) {
    if (arr.length == 1) return arr[0] = val;
    for (let i = 1; i < arr.length; i++) {
        if (val <= arr[i]) arr[i - 1] = val;
        else {
            arr[i - 1] = arr[i];
            arr[i] = val;
        }
    }
}