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makerectangle Batch , stdin/stdout

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makerectangle.html

Title

Problem Statement

We have N sticks with negligible thickness. The length of the i-th stick is Ai.

Snuke wants to select four different sticks from these sticks and form a rectangle (including a square), using the sticks as its sides. Find the maximum possible area of the rectangle.

Constraints

  • 4 ≤ N ≤ 105
  • 1 ≤ Ai ≤ 109
  • Ai is an integer.

Input

Input is given from Standard Input in the following format:

N
A1 A2 ... AN

Output

Print the maximum possible area of the rectangle. If no rectangle can be formed, print 0.

Sample Input 1

6
3 1 2 4 2 1

Sample Output 1

2

1 × 2 rectangle can be formed.

Sample Input 2

4
1 2 3 4

Sample Output 2

0

No rectangle can be formed.

Sample Input 3

10
3 3 3 3 4 4 4 5 5 5

Sample Output 3

20

Tags

AtCoder, Ad Hoc

Subtasks and Limits

Subtask Score #TC Time Memory Scoring
110091s256MBMinimum
2031s256MBMinimum

Judge Compile Command

g++-8 ans.cpp -o makerectangle -Wall -Wshadow -static -O2 -lm -m64 -s -w -std=gnu++17 -fmax-errors=512

Accepted Submissions

subIDUserTimeMax Time

Past Submissions

subIDUserTimeScore
mrJudge 09.05.20
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