排序算法的数组实现 -- 合并排序(三)
[cpp]
static const int Sentinel_Card = 100000;//哨兵,假设元素值都比它小
void static Merger(int *a, int p, int q, int r)
{
int L_Size = q - p + 1;
int R_Size = r - q;
int *a1 = new int[L_Size + 1];
int *a2 = new int[R_Size + 1];
for (int i = 0; i < L_Size; i++)
a1[i] = a[p + i];
a1[L_Size] = Sentinel_Card;
for (int i = 0; i < R_Size; i++)
{
a2[i] = a[q + 1 + i];
}
a2[R_Size] = Sentinel_Card;
int m = 0, n = 0;
for (int i = p; i <= r; i ++)
{
if(a1[m] < a2[n])
{
a[i] = a1[m];
m++;
}
else
{
a[i] = a2[n];
n++;
}
}
}
void Merger_Sort(int *a, int p, int r)
{
if(p < r)
{
int q = (p + r)/2;
Merger_Sort(a, p, q);
Merger_Sort(a, q + 1, r);
Merger(a, p, q, r);
}
}
static const int Sentinel_Card = 100000;//哨兵,假设元素值都比它小
void static Merger(int *a, int p, int q, int r)
{
int L_Size = q - p + 1;
int R_Size = r - q;
int *a1 = new int[L_Size + 1];
int *a2 = new int[R_Size + 1];
for (int i = 0; i < L_Size; i++)
a1[i] = a[p + i];
a1[L_Size] = Sentinel_Card;
for (int i = 0; i < R_Size; i++)
{
a2[i] = a[q + 1 + i];
}
a2[R_Size] = Sentinel_Card;
int m = 0, n = 0;
for (int i = p; i <= r; i ++)
{
if(a1[m] < a2[n])
{
a[i] = a1[m];
m++;
}
else
{
a[i] = a2[n];
n++;
}
}
}
void Merger_Sort(int *a, int p, int r)
{
if(p < r)
{
int q = (p + r)/2;
Merger_Sort(a, p, q);
Merger_Sort(a, q + 1, r);
Merger(a, p, q, r);
}
}
作者:wchm_seu
补充:软件开发 , C++ ,