제출 #1039037

#제출 시각아이디문제언어결과실행 시간메모리
1039037TrinhKhanhDungHacker (BOI15_hac)C++14
100 / 100
47 ms23488 KiB
#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]); } ll k = n - n / 2, ans = 0; vector<ll> pre(2 * n + 3, 0), p(2 * n + 3, 0); for(int i=1; i<=2*n; i++){ pre[i] = pre[i - 1] + a[i - 1]; if(i >= k) p[i] = pre[i] - pre[i - k]; // cout << p[i] << ' '; } deque<int> dq; for(int i=2*n; i>=k; i--){ if(sz(dq) && dq.front() - i >= k) dq.pop_front(); while(sz(dq) && p[dq.back()] > p[i]) dq.pop_back(); dq.push_back(i); if(i + k - 1 <= n*2){ maximize(ans, p[dq.front()]); } } 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; }
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