解决方案1： 计算数组中 0 的数量。假设我们得到 X 0 一旦我们得到计数，将 X 0 放入数组，并将 (nX) 1 放入数组的后半部分。 java代码：
public static int[] separate0s1sSolution1(int arr[])
{
int count=0;
for (int i = 0; i < arr.length; i++) {
if(arr[i]==0)
{
count++;
}
}
for (int i = 0; i < count; i++) {
arr[i]=0;
}
for (int i = count; i < arr.length; i++) {
arr[i]=1;
}
return arr;
}
时间复杂度：O(N) 解决方案2： 算法：
让我们说数组是 arr[]
java代码：
public static int[] separate0s1sSolution2(int arr[])
{
for (int i = 0; i < arr.length; i++) {
int left=0;
int right=arr.length-1;
while(arr[left]==0)
{
left++;
}
while(arr[right]==1)
{
right--;
}
if(left<right)
{
int temp=arr[left];
arr[left]=arr[right];
arr[right]=temp;
}
}
return arr;
}
用于分隔数组中奇数和偶数的 Java 代码：
package org.arpit.java2blog;
public class Separate0s1sMain {
public static void main(String[] args) {
int arr[]={0,1,0,0,1,1,1,0,1};
System.out.println("Original Array: ");
for (int i = 0; i < arr.length; i++) {
System.out.print(arr[i]+" ");
}
arr=separate0s1sSolution1(arr);
System.out.println("n===========================");
System.out.println("Solution 1");
System.out.println("nArray after separating 0's and 1's : ");
for (int i = 0; i < arr.length; i++) {
System.out.print(arr[i]+" ");
}
System.out.println("n===========================");
System.out.println("Solution 2");
arr=separate0s1sSolution2(arr);
System.out.println("nArray after separating 0's and 1's : ");
for (int i = 0; i < arr.length; i++) {
System.out.print(arr[i]+" ");
}
}
public static int[] separate0s1sSolution1(int arr[])
{
int count=0;
for (int i = 0; i < arr.length; i++) {
if(arr[i]==0)
{
count++;
}
}
for (int i = 0; i < count; i++) {
arr[i]=0;
}
for (int i = count; i < arr.length; i++) {
arr[i]=1;
}
return arr;
}
public static int[] separate0s1sSolution2(int arr[])
{
for (int i = 0; i < arr.length; i++) {
int left=0;
int right=arr.length-1;
while(arr[left]==0)
{
left++;
}
while(arr[right]==1)
{
right--;
}
if(left<right)
{
int temp=arr[left];
arr[left]=arr[right];
arr[right]=temp;
}
}
return arr;
}
}
当你运行上面的程序时，你会得到以下输出：
Original Array:
0 1 0 0 1 1 1 0 1
===========================
Solution 1
Array after separating 0's and 1's :
0 0 0 0 1 1 1 1 1
===========================
Solution 2
Array after separating 0's and 1's :
0 0 0 0 1 1 1 1 1
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