#include <bits/stdc++.h>
using namespace std;
#define int long long
#define INF (int)1e18
#define f first
#define s second
mt19937_64 RNG(chrono::steady_clock::now().time_since_epoch().count());
void Solve()
{
int n; cin >> n;
vector <int> a(2 * n + 1);
int tot = 0;
for (int i = 1; i <= n; i++){
cin >> a[i];
tot += a[i];
a[i + n] = a[i];
}
vector <int> p(2 * n + 1, 0);
for (int i = 1; i <= 2 * n; i++){
p[i] = p[i - 1] + a[i];
}
vector <int> v(2 * n + 1, 0);
int x = (n / 2);
for (int i = 1; i <= 2 * n; i++){
if (i + x > 2 * n) continue;
v[i] = p[i + x - 1] - p[i - 1];
}
int ans = 0;
int r;
multiset <int> st;
for (int i = 2; i <= n; i++){
if (i + n / 2 > n + 1) {
r = i;
break;
}
st.insert(v[i]);
}
int l = 2;
for (int i = 1; i <= n; i++){
ans = max(ans, tot - *(--st.end()));
if (i != n){
st.insert(v[r++]);
st.erase(st.find(v[l++]));
}
}
cout << ans << "\n";
}
int32_t main()
{
auto begin = std::chrono::high_resolution_clock::now();
ios_base::sync_with_stdio(0);
cin.tie(0);
int t = 1;
// freopen("in", "r", stdin);
// freopen("out", "w", stdout);
// cin >> t;
for(int i = 1; i <= t; i++)
{
//cout << "Case #" << i << ": ";
Solve();
}
auto end = std::chrono::high_resolution_clock::now();
auto elapsed = std::chrono::duration_cast<std::chrono::nanoseconds>(end - begin);
cerr << "Time measured: " << elapsed.count() * 1e-9 << " seconds.\n";
return 0;
}
Compilation message
hac.cpp: In function 'void Solve()':
hac.cpp:52:19: warning: 'r' may be used uninitialized in this function [-Wmaybe-uninitialized]
52 | st.insert(v[r++]);
| ^
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
212 KB |
Output is correct |
| 2 |
Correct |
0 ms |
328 KB |
Output is correct |
| 3 |
Correct |
1 ms |
212 KB |
Output is correct |
| 4 |
Correct |
1 ms |
320 KB |
Output is correct |
| 5 |
Correct |
1 ms |
212 KB |
Output is correct |
| 6 |
Correct |
1 ms |
212 KB |
Output is correct |
| 7 |
Correct |
1 ms |
340 KB |
Output is correct |
| 8 |
Correct |
1 ms |
340 KB |
Output is correct |
| 9 |
Correct |
1 ms |
324 KB |
Output is correct |
| 10 |
Correct |
1 ms |
340 KB |
Output is correct |
| 11 |
Correct |
1 ms |
340 KB |
Output is correct |
| 12 |
Correct |
1 ms |
340 KB |
Output is correct |
| 13 |
Correct |
1 ms |
212 KB |
Output is correct |
| 14 |
Correct |
0 ms |
212 KB |
Output is correct |
| 15 |
Correct |
1 ms |
212 KB |
Output is correct |
| 16 |
Correct |
1 ms |
340 KB |
Output is correct |
| 17 |
Correct |
1 ms |
324 KB |
Output is correct |
| 18 |
Correct |
1 ms |
340 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
212 KB |
Output is correct |
| 2 |
Correct |
0 ms |
328 KB |
Output is correct |
| 3 |
Correct |
1 ms |
212 KB |
Output is correct |
| 4 |
Correct |
1 ms |
320 KB |
Output is correct |
| 5 |
Correct |
1 ms |
212 KB |
Output is correct |
| 6 |
Correct |
1 ms |
212 KB |
Output is correct |
| 7 |
Correct |
1 ms |
340 KB |
Output is correct |
| 8 |
Correct |
1 ms |
340 KB |
Output is correct |
| 9 |
Correct |
1 ms |
324 KB |
Output is correct |
| 10 |
Correct |
1 ms |
340 KB |
Output is correct |
| 11 |
Correct |
1 ms |
340 KB |
Output is correct |
| 12 |
Correct |
1 ms |
340 KB |
Output is correct |
| 13 |
Correct |
1 ms |
212 KB |
Output is correct |
| 14 |
Correct |
0 ms |
212 KB |
Output is correct |
| 15 |
Correct |
1 ms |
212 KB |
Output is correct |
| 16 |
Correct |
1 ms |
340 KB |
Output is correct |
| 17 |
Correct |
1 ms |
324 KB |
Output is correct |
| 18 |
Correct |
1 ms |
340 KB |
Output is correct |
| 19 |
Correct |
1 ms |
340 KB |
Output is correct |
| 20 |
Correct |
1 ms |
340 KB |
Output is correct |
| 21 |
Correct |
1 ms |
340 KB |
Output is correct |
| 22 |
Correct |
1 ms |
468 KB |
Output is correct |
| 23 |
Correct |
3 ms |
596 KB |
Output is correct |
| 24 |
Correct |
1 ms |
468 KB |
Output is correct |
| 25 |
Correct |
2 ms |
596 KB |
Output is correct |
| 26 |
Correct |
2 ms |
596 KB |
Output is correct |
| 27 |
Correct |
1 ms |
328 KB |
Output is correct |
| 28 |
Correct |
1 ms |
212 KB |
Output is correct |
| 29 |
Correct |
1 ms |
212 KB |
Output is correct |
| 30 |
Correct |
2 ms |
596 KB |
Output is correct |
| 31 |
Correct |
2 ms |
596 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
212 KB |
Output is correct |
| 2 |
Correct |
1 ms |
320 KB |
Output is correct |
| 3 |
Correct |
2 ms |
596 KB |
Output is correct |
| 4 |
Correct |
26 ms |
6356 KB |
Output is correct |
| 5 |
Correct |
75 ms |
15156 KB |
Output is correct |
| 6 |
Correct |
98 ms |
19024 KB |
Output is correct |
| 7 |
Correct |
111 ms |
22820 KB |
Output is correct |
| 8 |
Correct |
229 ms |
37704 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
212 KB |
Output is correct |
| 2 |
Correct |
0 ms |
328 KB |
Output is correct |
| 3 |
Correct |
1 ms |
212 KB |
Output is correct |
| 4 |
Correct |
1 ms |
320 KB |
Output is correct |
| 5 |
Correct |
1 ms |
212 KB |
Output is correct |
| 6 |
Correct |
1 ms |
212 KB |
Output is correct |
| 7 |
Correct |
1 ms |
340 KB |
Output is correct |
| 8 |
Correct |
1 ms |
340 KB |
Output is correct |
| 9 |
Correct |
1 ms |
324 KB |
Output is correct |
| 10 |
Correct |
1 ms |
340 KB |
Output is correct |
| 11 |
Correct |
1 ms |
340 KB |
Output is correct |
| 12 |
Correct |
1 ms |
340 KB |
Output is correct |
| 13 |
Correct |
1 ms |
212 KB |
Output is correct |
| 14 |
Correct |
0 ms |
212 KB |
Output is correct |
| 15 |
Correct |
1 ms |
212 KB |
Output is correct |
| 16 |
Correct |
1 ms |
340 KB |
Output is correct |
| 17 |
Correct |
1 ms |
324 KB |
Output is correct |
| 18 |
Correct |
1 ms |
340 KB |
Output is correct |
| 19 |
Correct |
1 ms |
340 KB |
Output is correct |
| 20 |
Correct |
1 ms |
340 KB |
Output is correct |
| 21 |
Correct |
1 ms |
340 KB |
Output is correct |
| 22 |
Correct |
1 ms |
468 KB |
Output is correct |
| 23 |
Correct |
3 ms |
596 KB |
Output is correct |
| 24 |
Correct |
1 ms |
468 KB |
Output is correct |
| 25 |
Correct |
2 ms |
596 KB |
Output is correct |
| 26 |
Correct |
2 ms |
596 KB |
Output is correct |
| 27 |
Correct |
1 ms |
328 KB |
Output is correct |
| 28 |
Correct |
1 ms |
212 KB |
Output is correct |
| 29 |
Correct |
1 ms |
212 KB |
Output is correct |
| 30 |
Correct |
2 ms |
596 KB |
Output is correct |
| 31 |
Correct |
2 ms |
596 KB |
Output is correct |
| 32 |
Correct |
1 ms |
212 KB |
Output is correct |
| 33 |
Correct |
1 ms |
320 KB |
Output is correct |
| 34 |
Correct |
2 ms |
596 KB |
Output is correct |
| 35 |
Correct |
26 ms |
6356 KB |
Output is correct |
| 36 |
Correct |
75 ms |
15156 KB |
Output is correct |
| 37 |
Correct |
98 ms |
19024 KB |
Output is correct |
| 38 |
Correct |
111 ms |
22820 KB |
Output is correct |
| 39 |
Correct |
229 ms |
37704 KB |
Output is correct |
| 40 |
Correct |
3 ms |
980 KB |
Output is correct |
| 41 |
Correct |
6 ms |
1748 KB |
Output is correct |
| 42 |
Correct |
11 ms |
2504 KB |
Output is correct |
| 43 |
Correct |
96 ms |
15284 KB |
Output is correct |
| 44 |
Correct |
212 ms |
37704 KB |
Output is correct |
| 45 |
Correct |
33 ms |
7636 KB |
Output is correct |
| 46 |
Correct |
119 ms |
22672 KB |
Output is correct |
| 47 |
Correct |
234 ms |
37836 KB |
Output is correct |
| 48 |
Correct |
176 ms |
37956 KB |
Output is correct |
| 49 |
Correct |
162 ms |
37140 KB |
Output is correct |
| 50 |
Correct |
164 ms |
37072 KB |
Output is correct |
