Google Pen Test--sort, allow only 0 and other elements to exchange

2.2 Arrays of length n are stored in random order from 0 to n-1. Now you can do only 0 swap with other numbers, design and implement sorting.

The problem has an implied condition: that the array element is contiguous, that is, 0--n-1, when you have sequenced, you will find that the array element and the element's subscript are equal.

Idea: Take array 2 0 3 1 For example

1, first a[0]=2, according to the above conditions it should be placed in the position of a[2]. Because only 0 elements and other elements are allowed to be exchanged. So we can not directly exchange a[0] and a[2], so the 0 elements and A[2] interchange, get 2 3 0 1, then the a[0]=2 and a[2]=0 will be interchangeable, get 0 3 2 1

Following this idea, the implementation code is as follows:

//sort_google.cpp: Defines the entry point of the console application. //#include"stdafx.h"#include<iostream>using namespacestd;voidSwapint*a,intIintj) {    inttemp; Temp=A[i]; A[i]=A[j]; A[J]=temp;}intFindint*a,intLen) {     for(intI=0; i<len;i++)    {        if(a[i]==0)        {            returni; }    }}voidSortint*a,intLen) {     for(intI=0;i<len;)//notice there's no i++ here .    {        if(a[i]==i) {i++;//to be able to jump out of the loop is the main thing to see            Continue;        } Swap (A,find (A,len), a[i]);  for(intj=0; j<len;j++) {cout<<a[j]<<"  ";//This is just for the output array element to look at the element value of the array after sorting has no practical effect} cout<<Endl;        Swap (A,find (A,len), i);  for(intj=0; j<len;j++) {cout<<a[j]<<"  ";//This is just for the output array element to look at the element value of the array after sorting has no practical effect} cout<<Endl; Swap (A,find (A,len),0);//Place the 0 element in the a[0] position.     }    }int_tmain (intARGC, _tchar*argv[]) {    inta[]={1,Ten,9,7,5,2,3,4,0,6,8};//{3,2,0,1};    intlen=sizeof(a)/sizeof(int);    Sort (A,len);  for(intI=0; i<len;i++) {cout<<a[i]<<"  "; } cout<<Endl; return 0;}

As follows:

Google Pen Test--sort, allow only 0 and other elements to exchange