📜  最小索引,因此右边没有0或1

📅  最后修改于: 2021-04-22 03:46:41             🧑  作者: Mango

给定N个数字的二进制数组。任务是找到最小的索引,以使索引的右边没有1或0。
注意:该数组将至少具有一个0和1。
例子:

方法:存储最右边出现的索引1和0,并返回两者的最小值。
下面是上述方法的实现:

C++
// C++ program to implement
// the above approach
#include 
using namespace std;
 
// Function to find the smallest index
// such that there are no 0 or 1 to its right
int smallestIndex(int a[], int n)
{
    // Initially
    int right1 = 0, right0 = 0;
 
    // Traverse in the array
    for (int i = 0; i < n; i++) {
 
        // Check if array element is 1
        if (a[i] == 1)
            right1 = i;
 
        // a[i] = 0
        else
            right0 = i;
    }
 
    // Return minimum of both
    return min(right1, right0);
}
// Driver code
int main()
{
 
    int a[] = { 1, 1, 1, 0, 0, 1, 0, 1, 1 };
    int n = sizeof(a) / sizeof(a[0]);
    cout << smallestIndex(a, n);
 
    return 0;
}


Java
// Java program to implement
// the above approach
class GFG
{
     
// Function to find the smallest index
// such that there are no 0 or 1 to its right
static int smallestIndex(int []a, int n)
{
    // Initially
    int right1 = 0, right0 = 0;
 
    // Traverse in the array
    for (int i = 0; i < n; i++)
    {
 
        // Check if array element is 1
        if (a[i] == 1)
            right1 = i;
 
        // a[i] = 0
        else
            right0 = i;
    }
 
    // Return minimum of both
    return Math.min(right1, right0);
}
 
// Driver code
public static void main(String[] args)
{
    int []a = { 1, 1, 1, 0, 0, 1, 0, 1, 1 };
    int n = a.length;
    System.out.println(smallestIndex(a, n));
}
}
 
// This code is contributed
// by Code_Mech.


Python3
# Python 3 program to implement
# the above approach
 
# Function to find the smallest
# index such that there are no
# 0 or 1 to its right
def smallestIndex(a, n):
     
    # Initially
    right1 = 0
    right0 = 0
 
    # Traverse in the array
    for i in range(n):
         
        # Check if array element is 1
        if (a[i] == 1):
            right1 = i
 
        # a[i] = 0
        else:
            right0 = i
 
    # Return minimum of both
    return min(right1, right0)
 
# Driver code
if __name__ == '__main__':
    a = [1, 1, 1, 0, 0, 1, 0, 1, 1]
    n = len(a)
    print(smallestIndex(a, n))
     
# This code is contributed by
# Surendra_Gangwar


C#
// C# program to implement
// the above approach
using System;
class GFG
{
     
// Function to find the smallest index
// such that there are no 0 or 1 to its right
static int smallestIndex(int []a, int n)
{
    // Initially
    int right1 = 0, right0 = 0;
 
    // Traverse in the array
    for (int i = 0; i < n; i++)
    {
 
        // Check if array element is 1
        if (a[i] == 1)
            right1 = i;
 
        // a[i] = 0
        else
            right0 = i;
    }
 
    // Return minimum of both
    return Math.Min(right1, right0);
}
 
// Driver code
public static void Main()
{
    int []a = { 1, 1, 1, 0, 0, 1, 0, 1, 1 };
    int n = a.Length;
    Console.Write(smallestIndex(a, n));
}
}
 
// This code is contributed
// by Akanksha Rai


PHP


Javascript


输出:
6

时间复杂度:O(N)