Submission #9119686

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Source Code Expand

// ===================================
//   author: M_sea
//   website: http://m-sea-blog.com/
// ===================================
#include <algorithm>
#include <iostream>
#include <cstdlib>
#include <cstring>
#include <cstdio>
#include <vector>
#include <cmath>
#define re register
using namespace std;
typedef long long ll;

inline int read() {
    int X=0,w=1; char c=getchar();
    while (c<'0'||c>'9') { if (c=='-') w=-1; c=getchar(); }
    while (c>='0'&&c<='9') X=X*10+c-'0',c=getchar();
    return X*w;
}

const int N=100000+10;

int n,a[N];

int main() {
    n=read();
    for (re int i=1;i<=n;++i) a[i]=read();
    ll ans=0;
    for (re int i=1;i<=n;++i) {
        ans+=a[i]>>1,a[i]&=1;
        if (i<n&&a[i]&&a[i+1]) --a[i],--a[i+1],++ans;
    }
    printf("%lld\n",ans);
    return 0;
}

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