Problem:
Score : 400 points

Problem Statement

Snuke has a large collection of cards. Each card has an integer between 1 and N, inclusive, written on it.
He has A_i cards with an integer i.

Two cards can form a pair if the absolute value of the difference of the integers written on them is at most 1.

Snuke wants to create the maximum number of pairs from his cards, on the condition that no card should be used in multiple pairs. Find the maximum number of pairs that he can create.

Constraints

1 ≦ N ≦ 10^5

0 ≦ A_i ≦ 10^9 (1 ≦ i ≦ N)

All input values are integers.

Input

The input is given from Standard Input in the following format:

N
A_1
:
A_N

Output

Print the maximum number of pairs that Snuke can create.

Sample Input 1

4
4
0
3
2

Sample Output 1

4

For example, Snuke can create the following four pairs: (1,1),(1,1),(3,4),(3,4).

Sample Input 2

8
2
0
1
6
0
8
2
1

Sample Output 2

9

Solution in C++14 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <iostream>
#include<vector>
#include<algorithm>
#include<string>
#include<map>
#include<set>
#include<stack>
#include<queue>
#include<math.h>
using namespace std;
typedef long long ll;
#define int long long
typedef vector<int> VI;
#define REP(i,n) for(int i=0;i<n;i++)
#define eREP(i,n) for(int i=0;i<=n;i++)
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define eFOR(i,a,b) for(int i=(a);i<=(b);++i)
#define SORT(c) sort((c).begin(),(c).end())
#define rSORT(c) sort((c).rbegin(),(c).rend())
#define LB(x,a) lower_bound((x).begin(),(x).end(),(a))
#define UB(x,a) upper_bound((x).begin(),(x).end(),(a))
#define INF 1000000000
#define LLINF 9223372036854775807
#define mod 1000000007
//vector<vector<int> > dp;
//vector<vector<vector<int> > > vvvi;
//dp=vector<vector<int> >(N, vector<int>(M,0));
//vector<pair<int,int> > v;
//v.push_back(make_pair(x,y));



signed main(){
cin.tie(0);
ios::sync_with_stdio(false);

	int N;
	cin >> N;
	VI A(N);
	int ans = 0;
	REP(i, N) {
		cin >> A[i];
	}
	VI dp(N+1);
	dp[0]=0;
	eFOR(i,1, N) {
		//REP(i, N)cout << A[i];
		if (i == N) {
			dp[i] = dp[i - 1] + A[i - 1] / 2;
			break;
		}
		if (A[i - 1] == 0) {
			dp[i] = dp[i-1];
		}
		else if (A[i - 1] <= A[i]) {
			dp[i] = dp[i - 1] + A[i - 1];
			A[i] -= A[i - 1];
		}
		else {
			dp[i] = dp[i - 1] + A[i];
			A[i - 1] -= A[i];
			A[i] = 0;
			dp[i] += A[i - 1] / 2;
		}
		//cout <<" "<< dp[i] << endl;
	}
	cout << dp[N] << endl;


	return 0;
}