A Game of Numbers

3.6

175 votes
Data Structures, Easy, Stacks
Problem

You are given an array A of N integers. Now, two functions F(X) and G(X) are defined:

F(X) : This is the smallest number Z such that X<ZN and A[X]<A[Z]

G(X) : This is the smallest number Z such that X<ZN and A[X]>A[Z]

Now, you need to find for each index i of this array G(F(i)), where 1iN . If such a number does not exist, for a particular index i, output 1 as its answer. If such a number does exist, output A[G(F(i))]

Input :

The first line contains a single integer N denoting the size of array A. Each of the next N lines contains a single integer, where the integer on the ith line denotes A[i].

Output :

Print N space separated integers on a single line, where the ith integer denotes A[G(F(i))] or 1, if G(F(i)) does not exist.

Constraints:

1N30000

0A[i]1018

Sample Input
8
3
7
1
7
8
4
5
2
Sample Output
1 4 4 4 -1 2 -1 -1
Time Limit: 1
Memory Limit: 256
Source Limit:
Explanation

Next Greater     Next Smaller
3 --> 7                 7 -->1
7 --> 8                 8 -->4
1 --> 7                 7 --> 4
7 --> 8                 8 --> 4
8 --> -1                -1 --> -1
4 --> 5                 5 --> 2
5 --> -1                -1 --> -1
2 --> -1                -1 --> -1

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