Submission #1013071

#	Time	Username	Problem	Language	Result	Execution time	Memory
1013071		Alihan_8	Triple Jump (JOI19_jumps)	C++17	46 / 100	1872 ms	524288 KiB

jumps

#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{
    vector <int> T, add;

    SegTree(){
        T.resize(N * 8);

        add.resize(N * 8);
    }

    void push(int v, int l, int r){
        if ( l != r ){
            chmax(add[v * 2], add[v]);

            chmax(add[v * 2 + 1], add[v]);
        }

        chmax(T[v], add[v]);

        add[v] = 0;
    }

    void upd(int v, int l, int r, int tl, int tr, int x){
        push(v, l, r);

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

        if ( tl <= l && tr >= r ){
            add[v] = x;

            push(v, l, r);

            return;
        }

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

        upd(v * 2, l, md, tl, tr, x);

        upd(v * 2 + 1, md + 1, r, tl, tr, x);

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

    void upd(int l, int r, int x){
        upd(1, 0, 2 * n, l, r, x);
    }

    int get(int v, int l, int r, int x){
        push(v, l, r);

        if ( l > x ){
            return 0;
        }

        if ( r <= x ){
            return T[v];
        }

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

        return max(get(v * 2, l, md, x), get(v * 2 + 1, md + 1, r, x));
    }

    int get(int x){
        return get(1, 0, n * 2, x);
    }
};

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

    cin >> n;

    vector <int> a(n + 1);

    for ( int i = 1; i <= n; i++ ){
        cin >> a[i];
    }

    auto f = [&](int x, int l, int r){
        int opt = 0;

        if ( x > l ){ // x -> b
            int mx = a[x - 1], j = x - 2;

            for ( int i = x + 1; i <= r; i++ ){
                while ( j >= l && x - j <= i - x ){
                    chmax(mx, a[j]);

                    j--;
                }

                chmax(opt, mx + a[i] + a[x]);
            }
        }

        if ( x + 2 <= r ){ // x -> a
            int mx = a[x + 1], j = x + 2;

            for ( int i = x + 2; i <= r; i++ ){
                while ( j < i && i - j >= j - x ){
                    chmax(mx, a[j]);

                    j++;
                }

                chmax(opt, mx + a[i] + a[x]);
            }
        }

        if ( x - 2 >= l ){ // x -> c
            multiset <int> st{a[x - 1]};

            int j = x - 2;

            for ( int i = x - 1; i > l; i-- ){
                while ( j >= l && i - j <= x - i ){
                    st.insert(a[j]);

                    j--;
                }

                st.erase(st.find(a[i]));

                chmax(opt, *st.rbegin() + a[i] + a[x]);
            }
        }

        return opt;
    };

    int q; cin >> q;

    if ( q == 1 ){
        while ( q-- ){
            int l, r; cin >> l >> r;

            vector <ar<int,2>> b;

            for ( int i = l; i <= r; i++ ){
                b.pb({-a[i], i});
            }

            sort(all(b));

            vector <int> tmp;

            for ( int i = 0; i < min(30LL, (int)b.size()); i++ ){
                tmp.pb(b[i][1]);
            }

            int opt = 0;

            for ( auto &i: tmp ){
                chmax(opt, f(i, l, r));
            }

            cout << opt << ln;
        }
    } else{
        vector <vector<int>> dp(n + 2, vector <int> (n + 2));

        for ( int i = n - 2; i > 0; i-- ){
            int k = i + 1, mx = 0;

            for ( int j = i + 2; j <= n; j++ ){
                dp[i][j] = max(dp[i + 1][j], dp[i][j - 1]);

                while ( k < j && k - i <= j - k ){
                    chmax(mx, a[k]);

                    k++;
                }

                chmax(dp[i][j], mx + a[i] + a[j]);
            }
        }

        while ( q-- ){
            int l, r; cin >> l >> r;

            cout << dp[l][r] << ln;
        }
    }


    cout << '\n';
}

• Subtask 1: 5 / 5
• Subtask 2: 14 / 14
• Subtask 3: 27 / 27
• Subtask 4: 0 / 54