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 n respectively
1:特殊情况,B == NULL , n <= 0;2:分别从后道前遍历AB两个数组,并把相应的数字保存到数字A中;3:如果数组B中的数字存在剩余,则依次拷贝到数组A中
void merge(int A[], int m, int B[], int n)
{
if(B == NULL || n <= 0)
{
return;
}
int i = m - 1;
int j = n - 1;
int index = m + n - 1;
for(; i >= 0 && j >= 0;)
{
if(A[i] >= B[j])
{
A[index--] = A[i--];
}
else
{
A[index--] = B[j--];
}
}
if( j >= 0)
{
while(j >= 0)
{
A[index--] = B[j--];
}
}
return;
}