/*测试数据要求：不能是负数，同一数位上相同的数有一定限制*/
#include<iostream>
#include<cmath>
#include<ctime>
#include<cstdio>
using namespace std;
const int bitmaxsize = 50;//在同一位上相同的数的个数，一般情况下有数据个数的一半基本能满足要求
const int Maxarrsize = 100;//数组数据个数
void radixsort(int * arr, int num1, int num2, int n);
int getnumbit(int * arr, int length);
void print(int * arr, int length);
int main()
{
srand(time(0));
int m[Maxarrsize] = { 0 };
for (int i = 0; i < Maxarrsize; ++i)
m[i] = rand();
//m[68] = 26905;为什么此处加入六位数的时候会出现程序崩溃
const int arrsize = sizeof(m) / sizeof(int);
print(m, arrsize);
//cout << INT_MAX << "*****************\n";
//cout << pow(2, 31) << "*****************\n";
radixsort(m, 0, arrsize-1, getnumbit(m, arrsize));
print(m, arrsize); return 0;
}
int getnumbit(int * arr, int length)
{
if (length <= 0)return 0;
else
{
int i = 10;
for (;i>0; --i)
{
for (int j = 0; j < length&&j >= 0; ++j)
{
int t = pow(10, i);
if (arr[j] / t != 0)return i + 1;
}
}
return 0;
}
}
void print(int * arr, int length)
{
for (int i = 0; i < length; ++i)
cout << arr[i] << "\t";
cout << endl;
}
void radixsort(int * arr, int num1, int num2, int n)
{
struct heap
{
int m[bitmaxsize];
int count = 0;
};
heap *g=new heap[10];
for (int i = 1; i <= n; ++i)
{ int f = pow(10, i-1);
for (int j = 0;j < num2 - num1+ 1; ++j)
{
int t = (arr[j] / f) % 10;
g[t].m[g[t].count++] = arr[j];
}
int h = num2;
for (int j = 9; j >-1 ; --j)
{
for (; g[j].count > 0&&h>-1;h--)
{
arr[h] = g[j].m[--g[j].count];
}
}
}
cout << endl;
//for (int i = 0; i < 10; ++i)
//delete []g[i].m;
delete[]g;
}
