题目如下:
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.
分析如下:
数组A: {11111.........}
数组B: {2222}
A' (A after merge) = A + B , 因为 A 在题目中保证了有足够多的空间。
必然按照index从大到小的顺序进行merge,才不会把A的元素给抹掉。
我的代码:
//245ms
public class Solution {
public void merge(int A[], int m, int B[], int n) {
int j = m - 1;
int k = n - 1;
for (int i = m + n - 1; i >=0; --i) {
if (j >=0 && k >= 0) {
if (A[j] > B[k]) {
A[i] = A[j];
--j;
} else {
A[i] = B[k];
--k;
}
} else if (j >=0) {
A[i] = A[j];
--j;
} else if (k >=0) {
A[i] = B[k];
--k;
}
}
}
}