//将有序数组a[]和b[]合并到c[]中
void MemeryArray(int a[], int n, int b[], int m, int c[])
{
int i, j, k;
i = j = k = 0;
while (i < n && j < m)
{
if (a[i] < b[j])
c[k++] = a[i++];
else
c[k++] = b[j++];
}
while (i < n)
c[k++] = a[i++];
while (j < m)
c[k++] = b[j++];
}
//将有二个有序数列a[first...mid]和a[mid...last]合并。
void mergearray(int a[], int first, int mid, int last, int temp[])
{
int i = first, j = mid + 1;
int m = mid, n = last;
int k = 0;
while (i <= m && j <= n)
{
if (a[i] <= a[j])
temp[k++] = a[i++];
else
temp[k++] = a[j++];
}
while (i <= m)
temp[k++] = a[i++];
while (j <= n)
temp[k++] = a[j++];
for (i = 0; i < k; i++)
a[first + i] = temp[i];
}
void mergesort(int a[], int first, int last, int temp[])
{
if (first < last)
{
int mid = (first + last) / 2;
mergesort(a, first, mid, temp); //左边有序
mergesort(a, mid + 1, last, temp); //右边有序
mergearray(a, first, mid, last, temp); //再将二个有序数列合并
}
}
bool MergeSort(int a[], int n)
{
int *p = new int[n];
if (p == NULL)
return false;
mergesort(a, 0, n - 1, p);
delete[] p;
return true;
}
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