Submission #8893119

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Source Code Expand

import java.util.*;


public class Main{
	
	public static void main(String... args){
		Scanner scan = new Scanner(System.in);
		
		// input
		int num = scan.nextInt();
		long[] edges = new long[100000];
		for(int i = 0; i < num; i++){
			edges[i] = scan.nextLong();
		}
		
		// search
		Arrays.sort(edges);
		long memory = edges[99999];
		int count = 1;
		long firstLen = 0;
		long secondLen = -1;
		for(int i = 99998; i >= 0; i--){
			if(memory == edges[i]){
				count++;
				if(count == 2){
					if(edges[i] > firstLen){
						secondLen = firstLen;
						firstLen = edges[i];
						count = 0;
					} else if(edges[i] > secondLen){
						secondLen = edges[i];
						count = 0;
					}
				}
			} else {
				memory = edges[i];
				count = 1;
			}
		}
		
		// output
		long area = 0;
		if(firstLen * secondLen > 0){
			area = firstLen * secondLen;
		}
		System.out.println(area);
		
	}
	
}

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