Next Greater Element

Hard Stack: Applications PRO

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Problem Statement

Write a C program to find the Next Greater Element (NGE) for every element in an array using a stack (print the NGE for each element separated by spaces, or -1 if none exists).

Input Format

First line contains n. Second line contains n integers.

Output Format

Print the next greater elements separated by spaces.

Constraints

1 <= n <= 50

Sample Input

4
4 5 2 25

Sample Output

5 25 25 -1

Explanation

Use a monotonic stack storing indices or values to efficiently resolve next greater elements from right to left or left to right.

Starter Code

#include <stdio.h>
#include <stdlib.h>

int main() {
    int n;
    if (scanf("%d", &n) == 1) {
        // Write your code here to find next greater element using stack
    }
    return 0;
}

Limits

Time Limit: 1s
Memory Limit: 256MB

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