[LeetCode] Merge Sorted Array

Given two sorted integer arrays A and B, merge B into A as one sorted array.

Note: You may assume that A has enough space (size that is greater or equal to m + n) to hold additional elements from B. The number of elements initialized in A and B are m and n respectively.

编程思想：从后往前逆序把大元素依次填到A中合适的位置。

class Solution {
public:
void merge(int A[], int m, int B[], int n) {
int newIndex = m+n-1;
while(m>0 && n>0){
if(A[m-1]>B[n-1]){
A[newIndex]=A[m-1];
m--;
newIndex--;
}else{
A[newIndex]=B[n-1];
n--;
newIndex--;
}
}//end while
while(m>0){
A[newIndex]=A[m-1];
m--;
newIndex--;
}//end while
while(n>0){
A[newIndex]=B[n-1];
n--;
newIndex--;
}//end while
}
};