一个人可以站立的不同位置的数量

一个人站在n人的行列中，但他不知道自己所处的位置。他可以说站在他前面的人不少于“ f”个人，而站在他后面的人不多于“ b”个人。任务是找到他可以担任的不同职位的数量。

例子：

Input: n = 3, f = 1, b = 1 
Output: 2
3 is the number of people in the line and there can be no less than 1 people standing 
in front of him and no more than 1 people standing behind him.So the positions could be 2 and 3
(if we number the positions starting with 1).

Input: n = 5, f = 2, b = 3
Output: 3
In this example the positions are 3, 4, 5. 

方法：让我们遍历每个项目，并检查它是否适合条件a <= i-1和ni <= b(对于i从1到n)。第一个条件可以转换为a + 1 <= i ，而条件ni <= b在nb <= i中，则一般条件可以写成max(a + 1，nb)<= i ，然后我们的答案可以由公式n-max(a + 1，nb)+1计算。
下面是上述方法的实现：

C++

// C++ implementation of above approach
#include 
using namespace std;
 
// Function to find the position
int findPosition(int n, int f, int b)
{
 
    return n - max(f + 1, n - b) + 1;
}
 
// Driver code
int main()
{
 
    int n = 5, f = 2, b = 3;
    cout << findPosition(n, f, b);
 
  return 0;
}

Java

// Java implementation of above approach
import java.util.*;
import java.lang.*;
import java.io.*;
 
class GFG{
     
 
// Function to find the position
static int findPosition(int n, int f, int b)
{
 
    return n - Math.max(f + 1, n - b) + 1;
}
 
// Driver code
public static void main(String args[])
{
 
    int n = 5, f = 2, b = 3;
    System.out.print(findPosition(n, f, b));
 
}
}

Python3

# Python3 implementation of
# above approach
 
# Function to find the position
def findPosition(n, f, b):
 
    return n - max(f + 1, n - b) + 1;
 
# Driver code
n, f, b = 5, 2, 3
print(findPosition(n, f, b))
 
# This code is contributed by
# Sanjit_Prasad

C#

// C# implementation of above approach
using System;
class GFG
{
     
// Function to find the position
static int findPosition(int n,
                        int f, int b)
{
 
    return n - Math.Max(f + 1, n - b) + 1;
}
 
// Driver code
public static void Main()
{
    int n = 5, f = 2, b = 3;
    Console.WriteLine(findPosition(n, f, b));
}
}
 
// This code is contributed
// by inder_verma

Javascript

// Java Script implementation of above approach
     
 
// Function to find the position
function findPosition(n,f,b)
{
 
    return n - Math.max(f + 1, n - b) + 1;
}
 
// Driver code
 
 
    let n = 5, f = 2, b = 3;
    document.write(findPosition(n, f, b));
//contributed by 171fa07058

输出：

3

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