oj.uz

답안 #564182

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
564182 2022-05-18T16:45:31 Z 4fecta 3단 점프 (JOI19_jumps) C++17
46 / 100
 4000 ms 127344 KB 
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define int ll
#define ld long double
#define pii pair<int, int>
#define f first
#define s second
#define boost() cin.tie(0), cin.sync_with_stdio(0)

const int MN = 500005;

int n, q, a[MN], l, r, st[MN * 4], dp[5005][5005];

void build(int l, int r, int idx) {
    if (l == r) {st[idx] = a[l]; return;}
    int mid = (l + r) >> 1;
    build(l, mid, idx * 2), build(mid + 1, r, idx * 2 + 1);
    st[idx] = max(st[idx * 2], st[idx * 2 + 1]);
}

int qry(int l, int r, int x, int y, int idx) {
    if (r < x || l > y || r < l) return -0x3f3f3f3f;
    if (r <= y && l >= x) return st[idx];
    int mid = (l + r) >> 1;
    return max(qry(l, mid, x, y, idx * 2), qry(mid + 1, r, x, y, idx * 2 + 1));
}

int twos(int j, int i, int l, int r) {
    if (j > i) swap(i, j);
    int ret = 0;
    int lo = max(l, j - (i - j));
    ret = max(ret, qry(1, n, lo, j - 1, 1) + a[j] + a[i]);
    int hi = i + (i - j);
    ret = max(ret, qry(1, n, hi, r, 1) + a[j] + a[i]);
    int mid = (j + i) / 2;
    ret = max(ret, qry(1, n, j + 1, mid, 1) + a[j] + a[i]);
    return ret;
}

int check(int i, int l, int r) {
    int ret = 0;
    for (int j = l; j <= r; j++) {
        if (j != i) ret = max(ret, twos(i, j, l, r));
    }
    return ret;
}

int32_t main() {
    boost();

    cin >> n;
    for (int i = 1; i <= n; i++) cin >> a[i];
    build(1, n, 1);
    if (n <= 5000) {
        for (int len = 3; len <= n; len++) {
            for (int l = 1; l + len - 1 <= n; l++) {
                int r = l + len - 1;
                if (len == 3) dp[l][r] = a[l] + a[l + 1] + a[r];
                else dp[l][r] = max({dp[l + 1][r], dp[l][r - 1], twos(l, r, l, r)});
            }
        }
    }
    cin >> q;
    while (q--) {
        cin >> l >> r;
        if (n <= 5000) printf("%lld\n", dp[l][r]);
        else {
            vector<pii> v;
            for (int i = l; i <= r; i++) v.push_back({a[i], i});
            sort(v.begin(), v.end(), greater<>());
            int ans = 0;
            for (int i = 0; i < min((int) v.size(), 20ll); i++) {
                ans = max(ans, check(v[i].s, l, r));
            }
            printf("%lld\n", ans);
        }
    }

    return 0;
}

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 324 KB Output is correct
2 Correct 2 ms 724 KB Output is correct
3 Correct 2 ms 724 KB Output is correct
4 Correct 1 ms 752 KB Output is correct
5 Correct 2 ms 712 KB Output is correct
6 Correct 1 ms 724 KB Output is correct
7 Correct 2 ms 724 KB Output is correct
8 Correct 2 ms 724 KB Output is correct
9 Correct 1 ms 724 KB Output is correct
10 Correct 2 ms 724 KB Output is correct

Subtask #2
14.0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 324 KB Output is correct
2 Correct 2 ms 724 KB Output is correct
3 Correct 2 ms 724 KB Output is correct
4 Correct 1 ms 752 KB Output is correct
5 Correct 2 ms 712 KB Output is correct
6 Correct 1 ms 724 KB Output is correct
7 Correct 2 ms 724 KB Output is correct
8 Correct 2 ms 724 KB Output is correct
9 Correct 1 ms 724 KB Output is correct
10 Correct 2 ms 724 KB Output is correct
11 Correct 3915 ms 127344 KB Output is correct
12 Correct 3806 ms 127160 KB Output is correct
13 Correct 3806 ms 127148 KB Output is correct
14 Correct 3820 ms 127236 KB Output is correct
15 Correct 3804 ms 127220 KB Output is correct
16 Correct 3832 ms 126820 KB Output is correct
17 Correct 3826 ms 126468 KB Output is correct
18 Correct 3777 ms 126672 KB Output is correct
19 Correct 3812 ms 127024 KB Output is correct

Subtask #3
27.0 / 27.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1848 ms 10864 KB Output is correct
2 Correct 1661 ms 10836 KB Output is correct
3 Correct 1580 ms 10876 KB Output is correct
4 Correct 1751 ms 10888 KB Output is correct
5 Correct 1736 ms 10820 KB Output is correct
6 Correct 1806 ms 10784 KB Output is correct
7 Correct 1876 ms 10776 KB Output is correct
8 Correct 1887 ms 10868 KB Output is correct
9 Correct 1927 ms 10816 KB Output is correct

Subtask #4
0 / 54.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 324 KB Output is correct
2 Correct 2 ms 724 KB Output is correct
3 Correct 2 ms 724 KB Output is correct
4 Correct 1 ms 752 KB Output is correct
5 Correct 2 ms 712 KB Output is correct
6 Correct 1 ms 724 KB Output is correct
7 Correct 2 ms 724 KB Output is correct
8 Correct 2 ms 724 KB Output is correct
9 Correct 1 ms 724 KB Output is correct
10 Correct 2 ms 724 KB Output is correct
11 Correct 3915 ms 127344 KB Output is correct
12 Correct 3806 ms 127160 KB Output is correct
13 Correct 3806 ms 127148 KB Output is correct
14 Correct 3820 ms 127236 KB Output is correct
15 Correct 3804 ms 127220 KB Output is correct
16 Correct 3832 ms 126820 KB Output is correct
17 Correct 3826 ms 126468 KB Output is correct
18 Correct 3777 ms 126672 KB Output is correct
19 Correct 3812 ms 127024 KB Output is correct
20 Correct 1848 ms 10864 KB Output is correct
21 Correct 1661 ms 10836 KB Output is correct
22 Correct 1580 ms 10876 KB Output is correct
23 Correct 1751 ms 10888 KB Output is correct
24 Correct 1736 ms 10820 KB Output is correct
25 Correct 1806 ms 10784 KB Output is correct
26 Correct 1876 ms 10776 KB Output is correct
27 Correct 1887 ms 10868 KB Output is correct
28 Correct 1927 ms 10816 KB Output is correct
29 Execution timed out 4034 ms 25316 KB Time limit exceeded
30 Halted 0 ms 0 KB -