이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
#define ll long long
#define fast1 ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
#define endl "\n"
using namespace std;
#pragma GCC optimize("Ofast")
#pragma GCC target("fma,sse,sse2,sse3,avx")
#pragma GCC optimize("unroll-loops")
int n;
int dizi[1000005];
void solve()
{
    cin>>n;
    for(int i=1;i<=n;i++)
        cin>>dizi[i];
    int i=1;
    int j=n;
    int cevap=0;
    while(i<j)
    {
        if(dizi[i]!=dizi[j])
        {
            if(dizi[i]+dizi[i+1]==dizi[j])
            {
                cevap++;
                i+=2;
                j--;
            }
            else if(dizi[j]+dizi[j-1]==dizi[i])
            {
                cevap++;
                i++;
                j-=2;
            }
            else
            {
                cevap+=2;
                dizi[i+1]=dizi[i]+dizi[i+1];
                dizi[j-1]=dizi[j]+dizi[j-1];
                i++;
                j--;
            }
        }
        else
        {
            i++;
            j--;
        }
    }
    cout<<cevap;
}
signed main()
{
    fast1
    int t=1;
    //cin>>t;
    while(t--)
    {
        solve();
    }
    return 0;
}
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