oj.uz

답안 #1013563

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1013563 2024-07-03T16:27:13 Z Alihan_8 3단 점프 (JOI19_jumps) C++17
100 / 100
 658 ms 129508 KB 
#include <bits/stdc++.h>

using namespace std;

#define all(x) x.begin(), x.end()
#define ar array
#define pb push_back
#define ln '\n'
#define int long long

using i64 = long long;

template <class F, class _S>
bool chmin(F &u, const _S &v){
    bool flag = false;
    if ( u > v ){
        u = v; flag |= true;
    }
    return flag;
}

template <class F, class _S>
bool chmax(F &u, const _S &v){
    bool flag = false;
    if ( u < v ){
        u = v; flag |= true;
    }
    return flag;
}

const int N = 5e5 + 1;

int n;

struct SegTree{
    struct Info{
        int opt, mx[2];

        Info(){
            opt = mx[0] = mx[1] = 0;
        };
    };

    Info T[N * 4];

    Info merge(Info L, Info R){
        Info rt;

        for ( auto j: {0, 1} ){
            rt.mx[j] = max(L.mx[j], R.mx[j]);
        }

        rt.opt = max({L.opt, R.opt, L.mx[0] + R.mx[1]});

        return rt;
    }

    void upd(int v, int l, int r, int p, int x, int j){
        if ( l == r ){
            chmax(T[v].mx[j], x);

            chmax(T[v].opt, T[v].mx[0] + T[v].mx[1]);

            return;
        }

        int md = (l + r) >> 1;

        if ( p <= md ){
            upd(v * 2, l, md, p, x, j);
        } else{
            upd(v * 2 + 1, md + 1, r, p, x, j);
        }

        T[v] = merge(T[v * 2], T[v * 2 + 1]);
    }

    void upd(int p, int x, int j = 0){
        upd(1, 0, n - 1, p, x, j);
    }

    Info get(int v, int l, int r, int tl, int tr){
        Info ret;

        if ( l > tr or r < tl ){
            return ret;
        }

        if ( tl <= l && tr >= r ){
            return T[v];
        }

        int md = (l + r) >> 1;

        return merge(get(v * 2, l, md, tl, tr), get(v * 2 + 1, md + 1, r, tl, tr));
    }

    int query(int l, int r){
        return get(1, 0, n - 1, l, r).opt;
    }
} seg;

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    cin >> n;

    vector <int> a(n);

    for ( auto &u: a ){
        cin >> u;
    }

    vector <vector<int>> upd(n);

    stack <int> stk;

    for ( int i = 0; i < n; i++ ){
        while ( !stk.empty() && a[stk.top()] < a[i] ){
            stk.pop();
        }

        if ( !stk.empty() ){
            upd[stk.top()].pb(i);
        }

        stk.push(i);
    }

    while ( stk.size() ) stk.pop();

    for ( int i = n - 1; i >= 0; i-- ){
        while ( !stk.empty() && a[stk.top()] < a[i] ){
            stk.pop();
        }

        if ( !stk.empty() ){
            upd[i].pb(stk.top());
        }

        stk.push(i);
    }

    int q; cin >> q;

    vector <vector<ar<int,2>>> qu(n);

    for ( int i = 0; i < q; i++ ){
        int l, r; cin >> l >> r;

        --l, --r;

        qu[l].pb({i, r});
    }

    for ( int i = 0; i < n; i++ ){
        seg.upd(i, a[i], 1);
    }

    vector <int> ans(q);

    for ( int i = n - 1; i >= 0; i-- ){
        for ( auto &j: upd[i] ){
            if ( j * 2 - i < n ){
                seg.upd(j * 2 - i, a[i] + a[j]);
            }
        }

        for ( auto &[j, r]: qu[i] ){
            ans[j] = seg.query(i, r);
        }
    }

    for ( auto &u: ans ){
        cout << u << ln;
    }

    cout << '\n';
}

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 17 ms 47192 KB Output is correct
2 Correct 17 ms 47240 KB Output is correct
3 Correct 16 ms 47196 KB Output is correct
4 Correct 22 ms 47220 KB Output is correct
5 Correct 17 ms 47192 KB Output is correct
6 Correct 18 ms 47196 KB Output is correct
7 Correct 18 ms 47192 KB Output is correct
8 Correct 17 ms 47196 KB Output is correct
9 Correct 17 ms 47196 KB Output is correct
10 Correct 16 ms 47264 KB Output is correct

Subtask #2
14.0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 17 ms 47192 KB Output is correct
2 Correct 17 ms 47240 KB Output is correct
3 Correct 16 ms 47196 KB Output is correct
4 Correct 22 ms 47220 KB Output is correct
5 Correct 17 ms 47192 KB Output is correct
6 Correct 18 ms 47196 KB Output is correct
7 Correct 18 ms 47192 KB Output is correct
8 Correct 17 ms 47196 KB Output is correct
9 Correct 17 ms 47196 KB Output is correct
10 Correct 16 ms 47264 KB Output is correct
11 Correct 192 ms 74792 KB Output is correct
12 Correct 180 ms 74832 KB Output is correct
13 Correct 177 ms 74804 KB Output is correct
14 Correct 158 ms 74836 KB Output is correct
15 Correct 176 ms 74836 KB Output is correct
16 Correct 165 ms 74196 KB Output is correct
17 Correct 177 ms 74324 KB Output is correct
18 Correct 176 ms 74068 KB Output is correct
19 Correct 165 ms 74808 KB Output is correct

Subtask #3
27.0 / 27.0

# 결과 실행 시간 메모리 Grader output
1 Correct 105 ms 67668 KB Output is correct
2 Correct 73 ms 67872 KB Output is correct
3 Correct 86 ms 67916 KB Output is correct
4 Correct 99 ms 67520 KB Output is correct
5 Correct 108 ms 67540 KB Output is correct
6 Correct 106 ms 66896 KB Output is correct
7 Correct 100 ms 66760 KB Output is correct
8 Correct 108 ms 66632 KB Output is correct
9 Correct 111 ms 67152 KB Output is correct

Subtask #4
54.0 / 54.0

# 결과 실행 시간 메모리 Grader output
1 Correct 17 ms 47192 KB Output is correct
2 Correct 17 ms 47240 KB Output is correct
3 Correct 16 ms 47196 KB Output is correct
4 Correct 22 ms 47220 KB Output is correct
5 Correct 17 ms 47192 KB Output is correct
6 Correct 18 ms 47196 KB Output is correct
7 Correct 18 ms 47192 KB Output is correct
8 Correct 17 ms 47196 KB Output is correct
9 Correct 17 ms 47196 KB Output is correct
10 Correct 16 ms 47264 KB Output is correct
11 Correct 192 ms 74792 KB Output is correct
12 Correct 180 ms 74832 KB Output is correct
13 Correct 177 ms 74804 KB Output is correct
14 Correct 158 ms 74836 KB Output is correct
15 Correct 176 ms 74836 KB Output is correct
16 Correct 165 ms 74196 KB Output is correct
17 Correct 177 ms 74324 KB Output is correct
18 Correct 176 ms 74068 KB Output is correct
19 Correct 165 ms 74808 KB Output is correct
20 Correct 105 ms 67668 KB Output is correct
21 Correct 73 ms 67872 KB Output is correct
22 Correct 86 ms 67916 KB Output is correct
23 Correct 99 ms 67520 KB Output is correct
24 Correct 108 ms 67540 KB Output is correct
25 Correct 106 ms 66896 KB Output is correct
26 Correct 100 ms 66760 KB Output is correct
27 Correct 108 ms 66632 KB Output is correct
28 Correct 111 ms 67152 KB Output is correct
29 Correct 658 ms 126340 KB Output is correct
30 Correct 535 ms 127344 KB Output is correct
31 Correct 525 ms 123396 KB Output is correct
32 Correct 622 ms 126548 KB Output is correct
33 Correct 631 ms 126280 KB Output is correct
34 Correct 590 ms 123988 KB Output is correct
35 Correct 605 ms 123700 KB Output is correct
36 Correct 578 ms 123760 KB Output is correct
37 Correct 612 ms 125256 KB Output is correct
38 Correct 481 ms 129072 KB Output is correct
39 Correct 457 ms 129104 KB Output is correct
40 Correct 438 ms 125700 KB Output is correct
41 Correct 487 ms 125268 KB Output is correct
42 Correct 460 ms 125124 KB Output is correct
43 Correct 426 ms 126972 KB Output is correct
44 Correct 479 ms 129264 KB Output is correct
45 Correct 466 ms 129364 KB Output is correct
46 Correct 460 ms 126144 KB Output is correct
47 Correct 434 ms 125696 KB Output is correct
48 Correct 489 ms 125780 KB Output is correct
49 Correct 457 ms 127640 KB Output is correct
50 Correct 515 ms 129508 KB Output is correct
51 Correct 542 ms 129432 KB Output is correct
52 Correct 499 ms 127204 KB Output is correct
53 Correct 501 ms 126724 KB Output is correct
54 Correct 552 ms 126704 KB Output is correct
55 Correct 511 ms 128492 KB Output is correct