Find the maximum and minimum element in an array.

//Your program should make the minimum number of comparisons.

Time Complexity: O(n)

 //Here we have a full program

1:  #include<bits/stdc++.h>  
2:  using namespace std;  
3:  struct Pair   
4:  {  
5:       int min;  
6:       int max;  
7:  };   
8:  struct Pair getMinMax(int arr[], int n)  
9:  {  
10:       struct Pair minmax;        
11:       int i;  
12:       if (n == 1)  
13:       {  
14:            minmax.max = arr[0];  
15:            minmax.min = arr[0];        
16:            return minmax;  
17:       }   
18:       if (arr[0] > arr[1])   
19:       {  
20:            minmax.max = arr[0];  
21:            minmax.min = arr[1];  
22:       }   
23:       else  
24:       {  
25:            minmax.max = arr[1];  
26:            minmax.min = arr[0];  
27:       }   
28:       for(i = 2; i < n; i++)  
29:       {  
30:            if (arr[i] > minmax.max)        
31:                 minmax.max = arr[i];  
32:            else if (arr[i] < minmax.min)        
33:                 minmax.min = arr[i];  
34:       }  
35:       return minmax;  
36:  }  
37:  int main()  
38:  {  
39:       int arr[] = { 10, 11, 40, 41, 3, 9};  
40:       int arr_size = 6;  
41:       struct Pair minmax = getMinMax(arr, arr_size);  
42:       cout << "Minimum element is "  
43:            << minmax.min << endl;  
44:       cout << "Maximum element is "  
45:            << minmax.max;  
46:       return 0;  
47:  }