Submission #4051647

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
#define pb push_back
#define mp make_pair
#define rep(i,n) for(int i=0;i<(n);++i)

int main(){
	cin.tie(0);
	ios::sync_with_stdio(false);
	int n;cin >> n;
	vector<int> a(n);
	rep(i,n) cin >> a.at(i);
	sort(a.rbegin(),a.rend());
	ll b=0,c=0;
	bool flg=false;
	rep(i,n-1){
		if(a.at(i)==a.at(i+1)){
			if(flg){
				c=a.at(i);
				break;
			}
			else{
				b=a.at(i);
				i++;
				flg=true;
			}
		}
	}
	cout << b*c << endl;
}

Submission Info

Judge Result