#K52887. Dynamic Array Operations
Dynamic Array Operations
Dynamic Array Operations
You are given an initially empty array and a sequence of q operations. There are three types of operations:
- 1 x: Append the integer x to the end of the array.
- 2: Remove the last element of the array. If the array is empty, do nothing.
- 3: Print the maximum value in the array. If the array is empty, print
EMPTY
.
For example, consider the sequence of operations below:
9 1 5 1 10 3 2 3 1 7 2 2 3
The outputs for the type 3
operations are as follows: 10, 5 and EMPTY.
Note: When outputting numbers, print each result on a new line.
You may find the formula for maximum operation interesting: $$\max_{i=1}^{n}a_i$$, which in this problem means the max element in the current array.
inputFormat
The first line of input contains an integer q, the number of operations. Each of the following q lines contains an operation in one of the following formats:
1 x
— Append integer x to the array.2
— Remove the last element from the array.3
— Print the maximum value in the array, orEMPTY
if the array is empty.
outputFormat
For each operation of type 3
, output the result on a new line. If the array is empty during a 3
operation, output EMPTY
.
9
1 5
1 10
3
2
3
1 7
2
2
3
10
5
EMPTY
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