// BOI 2015 - Hacker
// Lúcio Cardoso
#include <bits/stdc++.h>
using namespace std;
const int maxn = 5e5+10;
const int inf = 1e9+10;
int n;
int v[2*maxn];
int tree[4*maxn], lazy[4*maxn];
void init(void)
{
for (int i = 0; i < 4*maxn; i++)
tree[i] = lazy[i] = inf;
}
void flush(int node, int l, int r)
{
if (lazy[node] == inf) return;
tree[node] = min(tree[node], lazy[node]);
if (l != r)
{
lazy[2*node] = min(lazy[2*node], lazy[node]);
lazy[2*node+1] = min(lazy[2*node+1], lazy[node]);
}
lazy[node] = inf;
}
void upd(int node, int l, int r, int a, int b, int v)
{
flush(node, l, r);
if (l > b || r < a) return;
if (l >= a && r <= b)
{
lazy[node] = v;
flush(node, l, r);
return;
}
int mid = (l+r)>>1;
upd(2*node, l, mid, a, b, v); upd(2*node+1, mid+1, r, a, b, v);
tree[node] = min(tree[2*node], tree[2*node+1]);
}
int query(int node, int l, int r, int pos)
{
flush(node, l, r);
if (l == r) return tree[node];
int mid = (l+r)>>1;
if (pos <= mid) return query(2*node, l, mid, pos);
return query(2*node+1, mid+1, r, pos);
}
int main(void)
{
init();
cin >> n;
int m = (n+1)/2;
for (int i = 1; i <= n; i++)
{
cin >> v[i];
v[n+i] = v[i];
}
int soma = 0;
for (int i = 1; i <= m; i++)
soma += v[i];
upd(1, 1, n, 1, m, soma);
int ans = 0;
for (int i = m + 1; i-m+1 <= n; i++)
{
soma -= v[i-m];
soma += v[i];
if (i <= n) upd(1, 1, n, i-m+1, i, soma);
else
{
upd(1, 1, n, i-m+1, n, soma);
upd(1, 1, n, 1, i-n, soma);
}
}
for (int i = 1; i <= n; i++)
ans = max(ans, query(1, 1, n, i));
cout << ans << "\n";
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
16 ms |
16000 KB |
Output is correct |
| 2 |
Correct |
18 ms |
16000 KB |
Output is correct |
| 3 |
Correct |
17 ms |
16128 KB |
Output is correct |
| 4 |
Correct |
16 ms |
16000 KB |
Output is correct |
| 5 |
Correct |
18 ms |
16000 KB |
Output is correct |
| 6 |
Correct |
16 ms |
16000 KB |
Output is correct |
| 7 |
Correct |
15 ms |
16000 KB |
Output is correct |
| 8 |
Correct |
17 ms |
16000 KB |
Output is correct |
| 9 |
Correct |
16 ms |
16000 KB |
Output is correct |
| 10 |
Correct |
16 ms |
16000 KB |
Output is correct |
| 11 |
Correct |
18 ms |
15972 KB |
Output is correct |
| 12 |
Correct |
17 ms |
16000 KB |
Output is correct |
| 13 |
Correct |
20 ms |
16000 KB |
Output is correct |
| 14 |
Correct |
16 ms |
16000 KB |
Output is correct |
| 15 |
Correct |
16 ms |
16000 KB |
Output is correct |
| 16 |
Correct |
20 ms |
16000 KB |
Output is correct |
| 17 |
Correct |
19 ms |
16000 KB |
Output is correct |
| 18 |
Correct |
15 ms |
16000 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
16 ms |
16000 KB |
Output is correct |
| 2 |
Correct |
18 ms |
16000 KB |
Output is correct |
| 3 |
Correct |
17 ms |
16128 KB |
Output is correct |
| 4 |
Correct |
16 ms |
16000 KB |
Output is correct |
| 5 |
Correct |
18 ms |
16000 KB |
Output is correct |
| 6 |
Correct |
16 ms |
16000 KB |
Output is correct |
| 7 |
Correct |
15 ms |
16000 KB |
Output is correct |
| 8 |
Correct |
17 ms |
16000 KB |
Output is correct |
| 9 |
Correct |
16 ms |
16000 KB |
Output is correct |
| 10 |
Correct |
16 ms |
16000 KB |
Output is correct |
| 11 |
Correct |
18 ms |
15972 KB |
Output is correct |
| 12 |
Correct |
17 ms |
16000 KB |
Output is correct |
| 13 |
Correct |
20 ms |
16000 KB |
Output is correct |
| 14 |
Correct |
16 ms |
16000 KB |
Output is correct |
| 15 |
Correct |
16 ms |
16000 KB |
Output is correct |
| 16 |
Correct |
20 ms |
16000 KB |
Output is correct |
| 17 |
Correct |
19 ms |
16000 KB |
Output is correct |
| 18 |
Correct |
15 ms |
16000 KB |
Output is correct |
| 19 |
Correct |
18 ms |
16000 KB |
Output is correct |
| 20 |
Correct |
16 ms |
16000 KB |
Output is correct |
| 21 |
Correct |
16 ms |
16000 KB |
Output is correct |
| 22 |
Correct |
18 ms |
16000 KB |
Output is correct |
| 23 |
Correct |
19 ms |
16000 KB |
Output is correct |
| 24 |
Correct |
16 ms |
16000 KB |
Output is correct |
| 25 |
Correct |
19 ms |
15996 KB |
Output is correct |
| 26 |
Correct |
21 ms |
16000 KB |
Output is correct |
| 27 |
Correct |
15 ms |
16000 KB |
Output is correct |
| 28 |
Correct |
16 ms |
16000 KB |
Output is correct |
| 29 |
Correct |
18 ms |
16000 KB |
Output is correct |
| 30 |
Correct |
21 ms |
16032 KB |
Output is correct |
| 31 |
Correct |
18 ms |
16000 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
16 ms |
16128 KB |
Output is correct |
| 2 |
Correct |
17 ms |
16000 KB |
Output is correct |
| 3 |
Correct |
18 ms |
16000 KB |
Output is correct |
| 4 |
Correct |
136 ms |
16760 KB |
Output is correct |
| 5 |
Correct |
185 ms |
17528 KB |
Output is correct |
| 6 |
Correct |
213 ms |
17912 KB |
Output is correct |
| 7 |
Correct |
261 ms |
18368 KB |
Output is correct |
| 8 |
Correct |
419 ms |
20088 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
16 ms |
16000 KB |
Output is correct |
| 2 |
Correct |
18 ms |
16000 KB |
Output is correct |
| 3 |
Correct |
17 ms |
16128 KB |
Output is correct |
| 4 |
Correct |
16 ms |
16000 KB |
Output is correct |
| 5 |
Correct |
18 ms |
16000 KB |
Output is correct |
| 6 |
Correct |
16 ms |
16000 KB |
Output is correct |
| 7 |
Correct |
15 ms |
16000 KB |
Output is correct |
| 8 |
Correct |
17 ms |
16000 KB |
Output is correct |
| 9 |
Correct |
16 ms |
16000 KB |
Output is correct |
| 10 |
Correct |
16 ms |
16000 KB |
Output is correct |
| 11 |
Correct |
18 ms |
15972 KB |
Output is correct |
| 12 |
Correct |
17 ms |
16000 KB |
Output is correct |
| 13 |
Correct |
20 ms |
16000 KB |
Output is correct |
| 14 |
Correct |
16 ms |
16000 KB |
Output is correct |
| 15 |
Correct |
16 ms |
16000 KB |
Output is correct |
| 16 |
Correct |
20 ms |
16000 KB |
Output is correct |
| 17 |
Correct |
19 ms |
16000 KB |
Output is correct |
| 18 |
Correct |
15 ms |
16000 KB |
Output is correct |
| 19 |
Correct |
18 ms |
16000 KB |
Output is correct |
| 20 |
Correct |
16 ms |
16000 KB |
Output is correct |
| 21 |
Correct |
16 ms |
16000 KB |
Output is correct |
| 22 |
Correct |
18 ms |
16000 KB |
Output is correct |
| 23 |
Correct |
19 ms |
16000 KB |
Output is correct |
| 24 |
Correct |
16 ms |
16000 KB |
Output is correct |
| 25 |
Correct |
19 ms |
15996 KB |
Output is correct |
| 26 |
Correct |
21 ms |
16000 KB |
Output is correct |
| 27 |
Correct |
15 ms |
16000 KB |
Output is correct |
| 28 |
Correct |
16 ms |
16000 KB |
Output is correct |
| 29 |
Correct |
18 ms |
16000 KB |
Output is correct |
| 30 |
Correct |
21 ms |
16032 KB |
Output is correct |
| 31 |
Correct |
18 ms |
16000 KB |
Output is correct |
| 32 |
Correct |
16 ms |
16128 KB |
Output is correct |
| 33 |
Correct |
17 ms |
16000 KB |
Output is correct |
| 34 |
Correct |
18 ms |
16000 KB |
Output is correct |
| 35 |
Correct |
136 ms |
16760 KB |
Output is correct |
| 36 |
Correct |
185 ms |
17528 KB |
Output is correct |
| 37 |
Correct |
213 ms |
17912 KB |
Output is correct |
| 38 |
Correct |
261 ms |
18368 KB |
Output is correct |
| 39 |
Correct |
419 ms |
20088 KB |
Output is correct |
| 40 |
Correct |
30 ms |
16000 KB |
Output is correct |
| 41 |
Correct |
30 ms |
16256 KB |
Output is correct |
| 42 |
Correct |
52 ms |
16376 KB |
Output is correct |
| 43 |
Correct |
174 ms |
17656 KB |
Output is correct |
| 44 |
Correct |
446 ms |
20088 KB |
Output is correct |
| 45 |
Correct |
88 ms |
16888 KB |
Output is correct |
| 46 |
Correct |
261 ms |
18424 KB |
Output is correct |
| 47 |
Correct |
413 ms |
20216 KB |
Output is correct |
| 48 |
Correct |
485 ms |
20192 KB |
Output is correct |
| 49 |
Correct |
454 ms |
20120 KB |
Output is correct |
| 50 |
Correct |
482 ms |
20088 KB |
Output is correct |
