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답안 #538996

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
538996 2022-03-18T07:13:29 Z Monarchuwu 3단 점프 (JOI19_jumps) C++17
100 / 100
 830 ms 50508 KB 
#include<iostream>
#include<algorithm>
using namespace std;
typedef long long ll;

typedef pair<int, int> pii;
#define ff first
#define ss second

const int N = 5e5 + 5;
int n, q;
int a[N];

struct Query {
    int l, r, id;
    bool operator < (const Query &o) const { return l > o.l; }
} Q[N];

int st[N], top;
int cnt;
pii p[N << 1];
void init() {
    for (int i = 1; i <= n; ++i) {
        while (top && a[st[top]] < a[i]) --top;
        if (top) p[++cnt] = pii(st[top], i);
        st[++top] = i;
    }

    top = 0;
    for (int i = n; i; --i) {
        while (top && a[st[top]] < a[i]) --top;
        if (top) p[++cnt] = pii(i, st[top]);
        st[++top] = i;
    }
}

int seg[1 << 20], laz[1 << 20], ma1[1 << 20], ma2[1 << 20];
void build(int u, int l, int r) {
    if (l == r) seg[u] = ma1[u] = a[l];
    else {
        int m = (l + r) >> 1, u1 = u << 1, u2 = u1 | 1;
        build(u1, l, m);
        build(u2, m + 1, r);
        seg[u] = ma1[u] = max(ma1[u1], ma1[u2]);
    }
}
void update(int u, int l, int r, int a, int b, int v) {
    if (a <= l && r <= b) {
        if (ma2[u] < v) {
            ma2[u] = laz[u] = v;
            seg[u] = max(seg[u], v + ma1[u]);
        }
        return;
    }
    int m = (l + r) >> 1, u1 = u << 1, u2 = u1 | 1;
    if (laz[u]) {
        if (laz[u] > ma2[u1]) {
            ma2[u1] = laz[u1] = laz[u];
            seg[u1] = max(seg[u1], laz[u] + ma1[u1]);
        }
        if (laz[u] > ma2[u2]) {
            ma2[u2] = laz[u2] = laz[u];
            seg[u2] = max(seg[u2], laz[u] + ma1[u2]);
        }
        laz[u] = 0;
    }

    if (a <= m) update(u1, l, m, a, b, v);
    if (m < b) update(u2, m + 1, r, a, b, v);
    seg[u] = max(seg[u1], seg[u2]);
}
void update(int l, int r, int v) {
    if (l <= r) update(1, 1, n, l, r, v);
}
int get(int u, int l, int r, int a, int b) {
    if (a <= l && r <= b) return seg[u];
    if (b < l || r < a) return 0;

    int m = (l + r) >> 1, u1 = u << 1, u2 = u1 | 1;
    if (laz[u]) {
        if (laz[u] > ma2[u1]) {
            ma2[u1] = laz[u1] = laz[u];
            seg[u1] = max(seg[u1], laz[u] + ma1[u1]);
        }
        if (laz[u] > ma2[u2]) {
            ma2[u2] = laz[u2] = laz[u];
            seg[u2] = max(seg[u2], laz[u] + ma1[u2]);
        }
        laz[u] = 0;
    }
    return max(get(u1, l, m, a, b), get(u2, m + 1, r, a, b));
}

int ans[N];
void solve() {
    init();
    sort(Q + 1, Q + q + 1);
    sort(p + 1, p + cnt + 1, [](const pii &a, const pii &b) { return a.ff > b.ff; });

    build(1, 1, n);
    for (int i = 1, j = 1; i <= q; ++i) {
        while (j <= cnt && p[j].ff >= Q[i].l) {
            update(p[j].ss * 2 - p[j].ff, n, a[p[j].ff] + a[p[j].ss]);
            ++j;
        }
        ans[Q[i].id] = get(1, 1, n, Q[i].l, Q[i].r);
    }
}

int main() {
    cin.tie(NULL)->sync_with_stdio(false);
    cin >> n;
    for (int i = 1; i <= n; ++i) cin >> a[i];

    cin >> q;
    for (int i = 1; i <= q; ++i)
        cin >> Q[i].l >> Q[i].r, Q[i].id = i;

    solve();
    for (int i = 1; i <= q; ++i) cout << ans[i] << '\n';
}
/**  /\_/\
 *  (= ._.)
 *  / >0  \>1
**/

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 324 KB Output is correct
6 Correct 1 ms 324 KB Output is correct
7 Correct 1 ms 328 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 388 KB Output is correct

Subtask #2
14.0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 324 KB Output is correct
6 Correct 1 ms 324 KB Output is correct
7 Correct 1 ms 328 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 388 KB Output is correct
11 Correct 233 ms 18216 KB Output is correct
12 Correct 233 ms 18136 KB Output is correct
13 Correct 234 ms 18180 KB Output is correct
14 Correct 275 ms 18216 KB Output is correct
15 Correct 239 ms 18172 KB Output is correct
16 Correct 225 ms 17592 KB Output is correct
17 Correct 254 ms 17480 KB Output is correct
18 Correct 252 ms 17452 KB Output is correct
19 Correct 224 ms 18044 KB Output is correct

Subtask #3
27.0 / 27.0

# 결과 실행 시간 메모리 Grader output
1 Correct 177 ms 12376 KB Output is correct
2 Correct 83 ms 13448 KB Output is correct
3 Correct 75 ms 13428 KB Output is correct
4 Correct 140 ms 14148 KB Output is correct
5 Correct 162 ms 14316 KB Output is correct
6 Correct 134 ms 13584 KB Output is correct
7 Correct 140 ms 13460 KB Output is correct
8 Correct 138 ms 13376 KB Output is correct
9 Correct 136 ms 13760 KB Output is correct

Subtask #4
54.0 / 54.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 324 KB Output is correct
6 Correct 1 ms 324 KB Output is correct
7 Correct 1 ms 328 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 388 KB Output is correct
11 Correct 233 ms 18216 KB Output is correct
12 Correct 233 ms 18136 KB Output is correct
13 Correct 234 ms 18180 KB Output is correct
14 Correct 275 ms 18216 KB Output is correct
15 Correct 239 ms 18172 KB Output is correct
16 Correct 225 ms 17592 KB Output is correct
17 Correct 254 ms 17480 KB Output is correct
18 Correct 252 ms 17452 KB Output is correct
19 Correct 224 ms 18044 KB Output is correct
20 Correct 177 ms 12376 KB Output is correct
21 Correct 83 ms 13448 KB Output is correct
22 Correct 75 ms 13428 KB Output is correct
23 Correct 140 ms 14148 KB Output is correct
24 Correct 162 ms 14316 KB Output is correct
25 Correct 134 ms 13584 KB Output is correct
26 Correct 140 ms 13460 KB Output is correct
27 Correct 138 ms 13376 KB Output is correct
28 Correct 136 ms 13760 KB Output is correct
29 Correct 830 ms 50248 KB Output is correct
30 Correct 601 ms 48448 KB Output is correct
31 Correct 671 ms 48324 KB Output is correct
32 Correct 781 ms 50308 KB Output is correct
33 Correct 818 ms 50344 KB Output is correct
34 Correct 750 ms 48108 KB Output is correct
35 Correct 748 ms 47796 KB Output is correct
36 Correct 812 ms 47752 KB Output is correct
37 Correct 776 ms 49216 KB Output is correct
38 Correct 641 ms 50424 KB Output is correct
39 Correct 631 ms 50264 KB Output is correct
40 Correct 580 ms 47052 KB Output is correct
41 Correct 588 ms 46596 KB Output is correct
42 Correct 621 ms 46492 KB Output is correct
43 Correct 616 ms 48256 KB Output is correct
44 Correct 604 ms 50508 KB Output is correct
45 Correct 620 ms 50272 KB Output is correct
46 Correct 593 ms 47168 KB Output is correct
47 Correct 610 ms 46732 KB Output is correct
48 Correct 614 ms 46840 KB Output is correct
49 Correct 655 ms 48740 KB Output is correct
50 Correct 679 ms 50304 KB Output is correct
51 Correct 650 ms 50388 KB Output is correct
52 Correct 715 ms 47908 KB Output is correct
53 Correct 678 ms 47588 KB Output is correct
54 Correct 659 ms 47608 KB Output is correct
55 Correct 712 ms 49180 KB Output is correct