Submission #1499517

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;
typedef unsigned long long u64;
typedef signed long long l64;
u64 over = 1000000007;

int main(void)
{
  cin.tie(0);
  ios::sync_with_stdio(false);
  cout << fixed;
  u64 n, prev, a;
  cin >> n >> prev;
  u64 ans = prev/2;
  prev = ans%2;
  for (int i = 1; i < n; ++i) {
    cin >> a;
    if (prev==1 && a>0) {ans++; a--;}
    ans+=a/2;
    prev = a%2;
  }
  cout << ans << endl;
  return 0;
}

Submission Info

Judge Result