Interesting Python Implementation for Next Greater Elements

In this article, we will learn about defining and user-defined functions to predict the next greatest element.

Problem statement

We are given an array & we need to print the Next Greater Element for every element present in the array. The Next greater Element for an arbitrary element y is the first greatest element present on the right side of x in array. Elements for which no greatest element exist, return -1 as output.4

Input test case

[12,1,2,3]

Output

12 -> -1 1 -> 3 2 -> 3 3 -> -1

Now let’s observe the source code.

Example

# Function Def elevalue(arr):    # Iteration    for i in range(0, len(arr)):       # slicing max       final = max(arr[i:])    # greatest check    if (arr[i] == final):       print("% d -> % d" % (arr[i], -1))    else:       print("% d -> % d" % (arr[i], final)) # Driver program def main():    arr = [12,1,2,3]    elevalue(arr)    arr = [1,34,2,1]    elevalue(arr) if __name__ == '__main__':       main()

Output

12 -> -1 1 -> 3 2 -> 3 3 -> -1 1 -> 34 34 -> -1 2 -> -1 1 -> -1

Conclusion

In this article, we learned about interesting python implementation for next greater elements by using a user-defined function.