生成给定长度的密码

给定一个整数N ，任务是生成长度为N的简单、中等和强级别的随机密码。

Easy level Password: Consists of only numbers or letters.
Medium level Password: Consists of Letters as well as numbers.
Strong level Password – Consists of Letters, numbers, and/or special characters.

例子：

Input: N = 5
Output:
Easy level password (only numbers): 98990
Easy password (only letters): tpFEQ
Medium level password: b3bC8
Strong level password: 7`74n

Input: N = 7
Output:
Easy level password (only numbers): 7508730
Easy level password (only letters): mDzKCjN
Medium level password: 4Z05s66
Strong level password: 2384Qu9

方法：
请按照以下步骤解决问题：

• 对于每个密码级别，遍历给定的长度。
• 要生成每个密码，请根据密码级别使用随机数生成随机分配字符和数字。

下面是上述方法的实现：

C

// C program to generate
// password of given length
#include 
#include 
#include 
  
// Function to generate easy level
// password with numbers
void easylevelpassnumbers(int n)
{
    int i;
  
    // Random character generation
    // setting the seed as TIME
    srand(time(NULL));
    printf("Easy level password "
           "(only numbers): ");
    for (i = 0; i < n; i++) {
  
        // rand() to assign random
        // characters in the password
        printf("%d", rand() % 10);
    }
    printf("\n");
}
  
// Function to generate easy level
// password with letters
void easylevelpassletters(int n)
{
    int i, d;
    printf("Easy level password"
           " (only letters): ");
    for (i = 0; i < n; i) {
        d = rand() % 123;
        if ((d >= 65 && d <= 90)
            || d >= 97) {
            printf("%c", (char)d);
            i++;
        }
    }
    printf("\n");
}
  
// Function to generate random
// medium level password
void midlevelpass(int n)
{
    int i, d;
    printf("Medium level password: ");
    for (i = 0; i < n; i++) {
        d = rand() % 123;
  
        // Random alphabetic characters
        if ((d >= 65 && d <= 90)
            || d >= 97) {
            printf("%c", (char)d);
        }
        else {
  
            // Random digits
            printf("%d", d % 10);
        }
    }
  
    printf("\n");
}
  
// Function to generate strong
// level password
void stronglevelpass(int n)
{
    int i, d;
    printf("Strong level password: ");
    for (i = 0; i < n; i++) {
        d = rand() % 200;
  
        // Random special characters
        if (d >= 33 && d <= 123) {
            printf("%c", (char)d);
        }
        else {
  
            // Random digits
            printf("%d", d % 10);
        }
    }
  
    printf("\n");
}
  
// Driver Code
int main()
{
    int n = 5;
  
    easylevelpassnumbers(n);
    easylevelpassletters(n);
    midlevelpass(n);
    stronglevelpass(n);
}

输出：

Easy level password (only numbers): 36707
Easy level password (only letters): cQWxF
Medium level password: 56G4w
Strong level password: 83s20

时间复杂度： O(N)
辅助空间： O(N)

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