Easy to understand java solution(0 ms) with a comment

  • 0
    public void merge(int[] nums1, int m, int[] nums2, int n) {
            int k=m+n-1;
            int i=m-1;
            int j=n-1;
            while(i>=0 && j>=0){
                nums1[k--] = nums1[i]>nums2[j]?nums1[i--]:nums2[j--];
                nums1[k--] = nums2[j--];
            //we dont need to do while(i>=0) because i belongs to nums1 and they will be already in place

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