Submission #1039022

#	Time	Username	Problem	Language	Result	Execution time	Memory
1039022		TrinhKhanhDung	Hacker (BOI15_hac)	C++14	0 / 100	0 ms	348 KiB

hac

#include <bits/stdc++.h>
#define ll long long
#define fi first
#define se second
#define sz(x) (int)x.size()
#define ALL(v) v.begin(),v.end()
#define MASK(k) (1LL << (k))
#define BIT(x, i) (((x) >> (i)) & 1)
#define oo (ll)1e18
#define INF (ll)1e9
#define MOD (ll)(1e9 + 7)

using namespace std;

template<class T1, class T2>
    bool maximize(T1 &a, T2 b){if(a < b){a = b; return true;} return false;}

template<class T1, class T2>
    bool minimize(T1 &a, T2 b){if(a > b){a = b; return true;} return false;}

template<class T1, class T2>
    void add(T1 &a, T2 b){a += b; if(a >= MOD) a -= MOD;}

template<class T1, class T2>
    void sub(T1 &a, T2 b){a -= b; if(a < 0) a += MOD;}

template<class T>
    void cps(T &v){sort(ALL(v)); v.resize(unique(ALL(v)) - v.begin());}

void solve(){
    int n; cin >> n;
    vector<int> a;
    for(int i=0; i<n; i++){
        int u; cin >> u;
        a.push_back(u);
    }
    for(int i=0; i<n; i++){
        a.push_back(a[i]);
    }
    vector<int> pre(2*n + 3);
    for(int i=1; i<=2*n; i++){
        pre[i] = pre[i - 1] + a[i - 1];
    }

    int k = n - n / 2, ans = 0;
    for(int i=k; i<=2*n-k+1; i++){
        maximize(ans, min(pre[i] - pre[i - k], pre[i + k - 1] - pre[i - 1]));
    }
    cout << ans << '\n';
}

signed main(){
    ios_base::sync_with_stdio(0); cin.tie(0);
//    freopen("task.inp", "r", stdin);
//    freopen("task.out", "w", stdout);

    int t = 1;
//    cin >> t;
    while(t--){
        solve();
    }

    return 0;
}

• Subtask 1: 0 / 20
• Subtask 2: 0 / 20
• Subtask 3: 0 / 20
• Subtask 4: 0 / 40