算法--计数排序【转】

http://www.cnblogs.com/kkun/archive/2011/11/23/2260299.html

http://www.cnblogs.com/eaglet/archive/2010/09/16/1828016.html

 

计数排序针对已知范围内的数字排序

public static void Sort(int[] A, out int[] B, int k)  {
    int[] C = new int[k + 1];
    B = new int[A.Length];
    for (int j = 0; j < A.Length; j++) {
        C[A[j]]++;
    }
    for (int i = 1; i <= k; i++) {
        C[i] += C[i-1];
    }
    for (int j = A.Length - 1; j >= 0; j--) {
        B[C[A[j]]-1] = A[j];
        C[A[j]]--;
    }
}