#include <bits/stdc++.h>
using namespace std;
struct Info {
int add = 0, a = 0, ans = 0;
};
Info operator+(Info a, Info b) {
return {max(a.add, b.add), max(a.a, b.a), max({a.ans, b.ans, a.add + b.a})};
}
int sz = 1;
vector<Info> t;
void init(int n, vector<int> a) {
sz = 1 << (__lg(n) + bool(n & (n - 1)));
t.assign(sz << 1, {});
for (int i = 0; i < n; ++i) {
t[i + sz].a = t[i + sz].ans = a[i];
}
for (int i = sz - 1; i > 0; --i) {
t[i] = t[i << 1] + t[i << 1 | 1];
}
}
Info rangeQuery(int l, int r, int x = 1, int lx = 0, int rx = sz) {
if (l >= rx || lx >= r) {
return {};
}
if (l <= lx && rx <= r) {
return t[x];
}
int mid = (lx + rx) >> 1;
return rangeQuery(l, r, x << 1, lx, mid) + rangeQuery(l, r, x << 1 | 1, mid, rx);
}
void modify(int i, int add) {
i += sz;
t[i].add = max(t[i].add, add);
t[i].ans = t[i].add + t[i].a;
while (i >>= 1) {
t[i] = t[i << 1] + t[i << 1 | 1];
}
}
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
int n;
cin >> n;
vector<int> a(n);
for (int i = 0; i < n; ++i) {
cin >> a[i];
}
vector<array<int, 3>> events;
auto relax = [&](int i, int j) {
int r = j + (j - i);
if (r < n) {
events.push_back({i, j, -1});
}
};
vector<int> stk;
for (int i = 0; i < n; ++i) {
while (!stk.empty() && a[stk.back()] <= a[i]) {
relax(stk.back(), i);
stk.pop_back();
}
if (!stk.empty()) {
relax(stk.back(), i);
}
stk.push_back(i);
}
int q;
cin >> q;
for (int i = 0; i < q; ++i) {
int l, r;
cin >> l >> r;
events.push_back({l - 1, r, i});
}
vector<int> ans(q);
sort(events.begin(), events.end(), [&](array<int, 3> x, array<int, 3> y) {
return x[0] != y[0] ? x[0] > y[0] : x[2] < y[2];
});
init(n, a);
set<array<int, 3>> st;
for (auto [i, j, tp]: events) {
if (tp > -1) {
ans[tp] = rangeQuery(i, j).ans;
} else {
int k = j + (j - i);
int sum = a[i] + a[j];
modify(k, sum);
}
}
for (int i = 0; i < q; ++i) {
cout << ans[i] << "\n";
}
return 0;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
212 KB |
Output is correct |
2 |
Correct |
1 ms |
324 KB |
Output is correct |
3 |
Correct |
1 ms |
212 KB |
Output is correct |
4 |
Correct |
1 ms |
340 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 |
212 KB |
Output is correct |
8 |
Correct |
1 ms |
212 KB |
Output is correct |
9 |
Correct |
1 ms |
316 KB |
Output is correct |
10 |
Correct |
1 ms |
212 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
212 KB |
Output is correct |
2 |
Correct |
1 ms |
324 KB |
Output is correct |
3 |
Correct |
1 ms |
212 KB |
Output is correct |
4 |
Correct |
1 ms |
340 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 |
212 KB |
Output is correct |
8 |
Correct |
1 ms |
212 KB |
Output is correct |
9 |
Correct |
1 ms |
316 KB |
Output is correct |
10 |
Correct |
1 ms |
212 KB |
Output is correct |
11 |
Correct |
494 ms |
17516 KB |
Output is correct |
12 |
Correct |
522 ms |
15940 KB |
Output is correct |
13 |
Correct |
473 ms |
16044 KB |
Output is correct |
14 |
Correct |
536 ms |
16088 KB |
Output is correct |
15 |
Correct |
511 ms |
16116 KB |
Output is correct |
16 |
Correct |
508 ms |
15348 KB |
Output is correct |
17 |
Correct |
509 ms |
17172 KB |
Output is correct |
18 |
Correct |
508 ms |
17012 KB |
Output is correct |
19 |
Correct |
510 ms |
17712 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
147 ms |
14372 KB |
Output is correct |
2 |
Correct |
95 ms |
12104 KB |
Output is correct |
3 |
Correct |
100 ms |
13168 KB |
Output is correct |
4 |
Correct |
146 ms |
14492 KB |
Output is correct |
5 |
Correct |
137 ms |
14484 KB |
Output is correct |
6 |
Correct |
128 ms |
13868 KB |
Output is correct |
7 |
Correct |
145 ms |
13696 KB |
Output is correct |
8 |
Correct |
134 ms |
13728 KB |
Output is correct |
9 |
Correct |
131 ms |
14056 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
212 KB |
Output is correct |
2 |
Correct |
1 ms |
324 KB |
Output is correct |
3 |
Correct |
1 ms |
212 KB |
Output is correct |
4 |
Correct |
1 ms |
340 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 |
212 KB |
Output is correct |
8 |
Correct |
1 ms |
212 KB |
Output is correct |
9 |
Correct |
1 ms |
316 KB |
Output is correct |
10 |
Correct |
1 ms |
212 KB |
Output is correct |
11 |
Correct |
494 ms |
17516 KB |
Output is correct |
12 |
Correct |
522 ms |
15940 KB |
Output is correct |
13 |
Correct |
473 ms |
16044 KB |
Output is correct |
14 |
Correct |
536 ms |
16088 KB |
Output is correct |
15 |
Correct |
511 ms |
16116 KB |
Output is correct |
16 |
Correct |
508 ms |
15348 KB |
Output is correct |
17 |
Correct |
509 ms |
17172 KB |
Output is correct |
18 |
Correct |
508 ms |
17012 KB |
Output is correct |
19 |
Correct |
510 ms |
17712 KB |
Output is correct |
20 |
Correct |
147 ms |
14372 KB |
Output is correct |
21 |
Correct |
95 ms |
12104 KB |
Output is correct |
22 |
Correct |
100 ms |
13168 KB |
Output is correct |
23 |
Correct |
146 ms |
14492 KB |
Output is correct |
24 |
Correct |
137 ms |
14484 KB |
Output is correct |
25 |
Correct |
128 ms |
13868 KB |
Output is correct |
26 |
Correct |
145 ms |
13696 KB |
Output is correct |
27 |
Correct |
134 ms |
13728 KB |
Output is correct |
28 |
Correct |
131 ms |
14056 KB |
Output is correct |
29 |
Correct |
1112 ms |
45416 KB |
Output is correct |
30 |
Correct |
985 ms |
39416 KB |
Output is correct |
31 |
Correct |
981 ms |
41480 KB |
Output is correct |
32 |
Correct |
1127 ms |
45448 KB |
Output is correct |
33 |
Correct |
1223 ms |
45412 KB |
Output is correct |
34 |
Correct |
1198 ms |
44636 KB |
Output is correct |
35 |
Correct |
1180 ms |
43996 KB |
Output is correct |
36 |
Correct |
1218 ms |
43996 KB |
Output is correct |
37 |
Correct |
1173 ms |
44624 KB |
Output is correct |
38 |
Correct |
915 ms |
44400 KB |
Output is correct |
39 |
Correct |
909 ms |
44396 KB |
Output is correct |
40 |
Correct |
878 ms |
43104 KB |
Output is correct |
41 |
Correct |
896 ms |
42888 KB |
Output is correct |
42 |
Correct |
907 ms |
42824 KB |
Output is correct |
43 |
Correct |
896 ms |
43744 KB |
Output is correct |
44 |
Correct |
961 ms |
44392 KB |
Output is correct |
45 |
Correct |
965 ms |
44396 KB |
Output is correct |
46 |
Correct |
980 ms |
43240 KB |
Output is correct |
47 |
Correct |
982 ms |
43068 KB |
Output is correct |
48 |
Correct |
980 ms |
43112 KB |
Output is correct |
49 |
Correct |
994 ms |
44260 KB |
Output is correct |
50 |
Correct |
1053 ms |
44396 KB |
Output is correct |
51 |
Correct |
1027 ms |
44268 KB |
Output is correct |
52 |
Correct |
1027 ms |
43612 KB |
Output is correct |
53 |
Correct |
1010 ms |
43688 KB |
Output is correct |
54 |
Correct |
973 ms |
43548 KB |
Output is correct |
55 |
Correct |
975 ms |
44344 KB |
Output is correct |