给定一个随机整数数组arr [] ，任务是将数组中的所有零推到数组的开头，将所有零推到数组的结尾。请注意，所有其他元素的顺序应相同。
例子：
Input: arr[] = {1, 2, 0, 4, 3, 0, 5, 0}
Output: 0 0 0 2 4 3 5 1
Input: arr[] = {1, 2, 0, 0, 0, 3, 6};
Output: 0 0 0 2 3 6 1
方法：从左到右遍历数组，并在开头移动所有不等于1的元素，然后在数组的末尾将1放在其余的索引中。现在，找到不等于1的最后一个元素的索引，然后说lastInd ，然后从该索引开始到数组的开头，将所有不等于0的元素最后推到lastInd ，然后将0放入开始。
下面是上述方法的实现：
C++
// C++ implementation of the approach
#include
using namespace std;
// Utility function to print
// the contenets of an array
void printArr(int arr[], int n)
{
for (int i = 0; i < n; i++)
cout << arr[i] << " ";
}
// Function that pushes all the zeros
// to the start and ones to the end of an array
void pushBinaryToBorder(int arr[], int n)
{
// To store the count of elements
// which are not equal to 1
int count1 = 0;
// Traverse the array and calculate
// count of elements which are not 1
for (int i = 0; i < n; i++)
if (arr[i] != 1)
arr[count1++] = arr[i];
// Now all non-ones elements have been shifted to
// front and 'count1' is set as index of first 1.
// Make all elements 1 from count to end.
while (count1 < n)
arr[count1++] = 1;
// Initialize lastNonBinary position to zero
int lastNonOne = 0;
// Traverse the array and pull non-zero
// elements to the required indices
for (int i = n - 1; i >= 0; i--) {
// Ignore the 1's
if (arr[i] == 1)
continue;
if (!lastNonOne) {
// Mark the position Of
// last NonBinary integer
lastNonOne = i;
}
// Place non-zero element to
// their required indices
if (arr[i] != 0)
arr[lastNonOne--] = arr[i];
}
// Put zeros to start of array
while (lastNonOne >= 0)
arr[lastNonOne--] = 0;
}
// Driver code
int main()
{
int arr[] = { 1, 2, 0, 0, 0, 3, 6 };
int n = sizeof(arr) / sizeof(arr[0]);
pushBinaryToBorder(arr, n);
printArr(arr, n);
return 0;
} Java
// Java implementation of the approach
import java.util.*;
class GFG
{
// Utility function to print
// the contenets of an array
static void printArr(int arr[], int n)
{
for (int i = 0; i < n; i++)
System.out.print(arr[i]+" ");
}
// Function that pushes all the zeros
// to the start and ones to the end of an array
static void pushBinaryToBorder(int arr[], int n)
{
// To store the count of elements
// which are not equal to 1
int count1 = 0;
// Traverse the array and calculate
// count of elements which are not 1
for (int i = 0; i < n; i++)
if (arr[i] != 1)
arr[count1++] = arr[i];
// Now all non-ones elements have been shifted to
// front and 'count1' is set as index of first 1.
// Make all elements 1 from count to end.
while (count1 < n)
arr[count1++] = 1;
// Initialize lastNonBinary position to zero
int lastNonOne = 0;
// Traverse the array and pull non-zero
// elements to the required indices
for (int i = n - 1; i >= 0; i--)
{
// Ignore the 1's
if (arr[i] == 1)
continue;
if (lastNonOne == 0)
{
// Mark the position Of
// last NonBinary integer
lastNonOne = i;
}
// Place non-zero element to
// their required indices
if (arr[i] != 0)
arr[lastNonOne--] = arr[i];
}
// Put zeros to start of array
while (lastNonOne >= 0)
arr[lastNonOne--] = 0;
}
// Driver code
public static void main(String args[])
{
int arr[] = { 1, 2, 0, 0, 0, 3, 6 };
int n = arr.length;
pushBinaryToBorder(arr, n);
printArr(arr, n);
}
}
// This code is contributed by SURENDRA_GANGWAR.Python3
# Python3 implementation of the approach
# Utility function to print
# the contenets of an array
def printArr(arr, n) :
for i in range(n) :
print(arr[i],end=" ")
# Function that pushes all the zeros
# to the start and ones to the end of an array
def pushBinaryToBorder(arr, n) :
# To store the count of elements
# which are not equal to 1
count1 = 0
# Traverse the array and calculate
# count of elements which are not 1
for i in range(n) :
if (arr[i] != 1) :
arr[count1] = arr[i]
count1 += 1
# Now all non-ones elements have been shifted to
# front and 'count1' is set as index of first 1.
# Make all elements 1 from count to end.
while (count1 < n) :
arr[count1] = 1
count1 += 1
# Initialize lastNonBinary position to zero
lastNonOne = 0
# Traverse the array and pull non-zero
# elements to the required indices
for i in range(n - 1, -1, -1) :
# Ignore the 1's
if (arr[i] == 1) :
continue
if (not lastNonOne) :
# Mark the position Of
# last NonBinary integer
lastNonOne = i
# Place non-zero element to
# their required indices
if (arr[i] != 0) :
arr[lastNonOne] = arr[i]
lastNonOne -= 1
# Put zeros to start of array
while (lastNonOne >= 0) :
arr[lastNonOne] = 0
lastNonOne -= 1
# Driver code
if __name__ == "__main__" :
arr = [ 1, 2, 0, 0, 0, 3, 6 ];
n = len(arr);
pushBinaryToBorder(arr, n)
printArr(arr, n)
# This code is contributed by RyugaC#
// C# implementation of the approach
using System;
class GFG
{
// Utility function to print
// the contenets of an array
static void printArr(int []arr, int n)
{
for (int i = 0; i < n; i++)
Console.Write(arr[i] + " ");
}
// Function that pushes all the zeros
// to the start and ones to the end of an array
static void pushBinaryToBorder(int [] arr, int n)
{
// To store the count of elements
// which are not equal to 1
int count1 = 0;
// Traverse the array and calculate
// count of elements which are not 1
for (int i = 0; i < n; i++)
if (arr[i] != 1)
arr[count1++] = arr[i];
// Now all non-ones elements have been shifted to
// front and 'count1' is set as index of first 1.
// Make all elements 1 from count to end.
while (count1 < n)
arr[count1++] = 1;
// Initialize lastNonBinary position to zero
int lastNonOne = 0;
// Traverse the array and pull non-zero
// elements to the required indices
for (int i = n - 1; i >= 0; i--)
{
// Ignore the 1's
if (arr[i] == 1)
continue;
if (lastNonOne == 0)
{
// Mark the position Of
// last NonBinary integer
lastNonOne = i;
}
// Place non-zero element to
// their required indices
if (arr[i] != 0)
arr[lastNonOne--] = arr[i];
}
// Put zeros to start of array
while (lastNonOne >= 0)
arr[lastNonOne--] = 0;
}
// Driver code
public static void Main()
{
int []arr = { 1, 2, 0, 0, 0, 3, 6 };
int n = arr.Length;
pushBinaryToBorder(arr, n);
printArr(arr, n);
}
}
// This code is contributed by Mohit kumar 29.输出：
0 0 0 2 3 6 1