Submission #1010645

#	Time	Username	Problem	Language	Result	Execution time	Memory
1010645		danikoynov	Triple Jump (JOI19_jumps)	C++14	5 / 100	1 ms	612 KiB

jumps

#include<bits/stdc++.h>
#define endl '\n'
const int MAX_N = 110;

int n, q, a[MAX_N];
void input()
{
    std::cin >> n;
    for (int i = 1; i <= n; i ++)
        std::cin >> a[i];
}

std::vector < std::pair < int, int > > fun;

void precompute_pairs()
{
    std::stack < int > st;
    for (int i = n; i > 0; i --)
    {
        while(!st.empty() && a[st.top()] <= a[i])
        {
            fun.push_back({i, st.top()});
            st.pop();
        }
        st.push(i);
    }

    while(!st.empty())
        st.pop();
    for (int i = 1; i <= n; i ++)
    {
        while(!st.empty() && a[st.top()] <= a[i])
        {
            ///std::cout << "pop " << st.top() << " from " << i << endl;
            fun.push_back({st.top(), i});
            st.pop();
        }
        st.push(i);
    }  
}

int fp[MAX_N];

void single_query(int l, int r)
{
    fp[r + 1] = 0;
    for (int i = r; i >= l; i --)
    {
        fp[i] = std::max(fp[i + 1], a[i]);
    }

    int res = 0;
    for (std::pair < int, int > cur : fun)
    {
        int id = 2 * cur.second - cur.first;
        if (id > r || cur.first < l)
            continue;
        //std::cout << "query " << cur.first << " " << cur.second << " " << id << endl;
        res = std::max(res, a[cur.first] + a[cur.second] + fp[id]);
    }

    /**for (int i = l; i <= r; i ++)
        for (int f = i + 1; f <= r; f ++)
            for (int j = 2 * f - i; j <= r; j ++)
            {
                if (a[i] + a[j] + a[f] == 174)
                    std::cout << "winner " << i << " " << f << " " << j << endl;
            }*/
    std::cout << res << endl;
}
void answer_queries()
{
    std::cin >> q;
    for (int i = 1; i <= q; i ++)
    {
        int l, r;
        std::cin >> l >> r;
        single_query(l, r);
    }
}


void solve()
{
    input();
    precompute_pairs();
    answer_queries();
}

void speed()
{
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(nullptr);
    std::cout.tie(nullptr);
}
int main()
{   
    speed();
    solve();
    return 0;
}
/*
15
12 96 100 61 54 66 37 34 58 21 21 1 13 50 81
1
6 14
*/

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