数据结构-基数排序

#include <iostream>

using namespace std;

void CountSort(int* a,int k,int n){
    int s = 1;
    for(int i=0;i<k;i++){
        s *= 10;
    }

    int* b = new int[n];
    int* c = new int[n];

    for(int i=0;i<n;i++){
        b[i] = 0;
        c[i] = 0;
    }

    int tmp1 = 0;
    for(int i=0;i<n;i++){
        tmp1 = a[i] % s;
        tmp1 = tmp1 * 10 / s;

        b[tmp1] = b[tmp1] + 1;
    }

    for(int i=1;i<n;i++){
        b[i] = b[i] + b[i-1];
    }

    int tmp2 = 0;
    for(int i=n-1;i>=0;i--){
        tmp1 = a[i];
        tmp2 = a[i] % s;
        tmp2 = tmp2 * 10 / s;

        c[b[tmp2]-1] = tmp1;
        b[tmp2] = b[tmp2] - 1;
    }

    for(int i=0;i<n;i++){
        a[i] = c[i];
    }

    delete[] b;
    delete[] c;
}

void RadixSort(int* a,int n){
    int max = 0;
    for(int i=0;i<n;i++){
        int length = 2;
        int tmp = a[i];
        while(tmp / 10 != 0){
            tmp /= 10;
            length++;
        }
        if(length > max){
            max = length;
        }
    }

    for(int i=1;i<=max;i++){
        CountSort(a,i,n);
    }
}

int main(){
    int a[] = {23,1,2032,458,42341,13,551,132446,3212,15};
    int n = sizeof(a)/sizeof(*a);

    RadixSort(a,n);

    for(size_t i=0;i<n;i++){
        cout << a[i] << " ";
    }

    return 0;
}