답안 #916097

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
916097	2024-01-25T09:33:54 Z	boris_mihov	별자리 3 (JOI20_constellation3)	C++17	100 / 100	1032 ms	129528 KB

constellation3

#include <algorithm>
#include <iostream>
#include <cassert>
#include <numeric>
#include <vector>
#include <stack>

typedef long long llong;
const int MAXLOG = 19;
const int MAXN = 400000 + 10;
const int INF  = 1e9;

int n, m;
int a[MAXN];
int h[MAXN];
int cntSegm;

struct Sparse
{
    int sparse[MAXLOG][MAXN];
    void build(int par[])
    {
        for (int i = 1 ; i <= cntSegm ; ++i)
        {
            sparse[0][i] = par[i];
        }

        for (int log = 1 ; (1 << log) <= cntSegm ; ++log)
        {
            for (int i = 1 ; i <= cntSegm ; ++i)
            {
                sparse[log][i] = sparse[log - 1][sparse[log - 1][i]];
            }
        }
    }

    int find(int x, int y)
    {
        for (int log = MAXLOG - 1 ; log >= 0 ; --log)
        {
            if (h[sparse[log][x]] < y)
            {
                x = sparse[log][x];
            }
        }

        return x;
    }
};

struct SegmentTree
{
    struct Node
    {
        llong value;
        llong lazy;

        Node()
        {
            value = lazy = 0;
        }
    };  

    Node tree[4*MAXN];
    void push(int node, int l, int r)
    {
        if (l == r)
        {
            tree[node].value += tree[node].lazy;
        } else
        {
            tree[2*node].lazy += tree[node].lazy;
            tree[2*node + 1].lazy += tree[node].lazy;
        }

        tree[node].lazy = 0;
    }

    void update(int l, int r, int node, int queryL, int queryR, llong queryValue)
    {
        push(node, l, r);
        if (queryR < l || r < queryL)
        {
            return;
        }

        if (queryL <= l && r <= queryR)
        {
            tree[node].lazy += queryValue;
            push(node, l, r);
            return;
        }

        int mid = (l + r) / 2;
        update(l, mid, 2*node, queryL, queryR, queryValue);
        update(mid + 1, r, 2*node + 1, queryL, queryR, queryValue);
    }

    llong query(int l, int r, int node, int queryPos)
    {
        push(node, l, r);
        if (l == r)
        {
            return tree[node].value;
        }

        int mid = (l + r) / 2;
        if (queryPos <= mid) return query(l, mid, 2*node, queryPos);
        return query(mid + 1, r, 2*node + 1, queryPos);
    }

    void update(int l, int r, llong val)
    {
        assert(l >= 0 && r <= cntSegm);
        update(0, cntSegm, 1, l, r, val);
    }

    llong query(int pos)
    {
        return query(0, cntSegm, 1, pos);
    }
};

int x[MAXN];
int y[MAXN];
int c[MAXN];
int in[MAXN];
int out[MAXN];
int par[MAXN];
llong dp[MAXN];
llong sum[MAXN];
int leftSegm[MAXN];
int rightSegm[MAXN];
int leftBigger[MAXN];
std::vector <int> g[MAXN];
std::vector <int> stars[MAXN];
std::stack <int> st;
SegmentTree tree;
Sparse sparse;

int timer;
void buildDFS(int node)
{
    in[node] = timer++;
    for (const int &u : g[node])
    {
        buildDFS(u);
    }

    out[node] = timer - 1;
}

void solveDFS(int node)
{
    for (const int &u : g[node])
    {
        solveDFS(u);
        sum[node] += dp[u];
    }

    llong res = sum[node];
    tree.update(in[node], out[node], sum[node]);

    for (const int &idx : stars[node])
    {
        res = std::max(res, c[idx] + tree.query(in[par[leftSegm[x[idx]]]]));
    }

    dp[node] = res;
    tree.update(in[node], out[node], -dp[node]);
}

void solve()
{
    a[0] = INF;
    h[0] = INF;
    st.push(0);
    for (int i = 1 ; i <= n ; ++i)
    {
        while (a[st.top()] < a[i])
        {
            st.pop();
        }

        leftBigger[i] = st.top();
        st.push(i);
    }

    while (st.size())
    {
        st.pop();
    }

    for (int i = 1 ; i <= n ; ++i)
    {
        bool wasThere = false;
        if (a[leftBigger[i]] == a[i]) 
        {
            wasThere = true;
            leftSegm[i] = rightSegm[leftBigger[i]];
        } else 
        {
            leftSegm[i] = ++cntSegm;
        }

        rightSegm[i] = ++cntSegm;
        h[leftSegm[i]] = a[i];
        h[rightSegm[i]] = a[i];

        while (st.size() && a[st.top()] < a[i])
        {
            if (!wasThere && (par[leftSegm[st.top()]] == 0 || h[par[leftSegm[st.top()]]] > a[i]))
            {
                par[rightSegm[st.top()]] = leftSegm[i];
                par[leftSegm[st.top()]] = leftSegm[i];
            }
            
            st.pop();
        }

        if (st.size())
        {
            if (a[st.top()] > a[i]) 
            {
                par[leftSegm[i]] = rightSegm[st.top()];
                par[rightSegm[i]] = rightSegm[st.top()];
            } else 
            {
                par[leftSegm[i]] = par[rightSegm[st.top()]];
                par[rightSegm[i]] = par[rightSegm[st.top()]];
            }
        }
        
        st.push(i);
    }


    for (int i = 1 ; i <= cntSegm ; ++i)
    {
        g[par[i]].push_back(i);
    }

    sparse.build(par);
    llong sumStars = 0;
    for (int i = 1 ; i <= m ; ++i)
    {
        stars[par[sparse.find(leftSegm[x[i]], y[i])]].push_back(i);
        sumStars += c[i];
    }

    buildDFS(0);
    solveDFS(0);
    std::cout << sumStars - dp[0] << '\n';
}

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

    std::cin >> m;
    for (int i = 1 ; i <= m ; ++i)
    {
        std::cin >> x[i] >> y[i] >> c[i];
    }
}

void fastIOI()
{
    std::ios_base :: sync_with_stdio(0);
    std::cout.tie(nullptr);
    std::cin.tie(nullptr);
}

int main()
{
    fastIOI();
    input();
    solve();

    return 0;
}

Subtask #1
14.0 / 14.0

#	결과	실행 시간	메모리	Grader output
1	Correct	19 ms	78428 KB	Output is correct
2	Correct	16 ms	78684 KB	Output is correct
3	Correct	17 ms	76380 KB	Output is correct
4	Correct	15 ms	78312 KB	Output is correct
5	Correct	16 ms	78428 KB	Output is correct
6	Correct	16 ms	76388 KB	Output is correct
7	Correct	17 ms	78428 KB	Output is correct
8	Correct	16 ms	78428 KB	Output is correct
9	Correct	16 ms	78428 KB	Output is correct
10	Correct	15 ms	76380 KB	Output is correct
11	Correct	16 ms	76448 KB	Output is correct
12	Correct	15 ms	76464 KB	Output is correct
13	Correct	16 ms	78428 KB	Output is correct
14	Correct	16 ms	76376 KB	Output is correct
15	Correct	16 ms	76636 KB	Output is correct
16	Correct	16 ms	76424 KB	Output is correct
17	Correct	17 ms	78432 KB	Output is correct
18	Correct	16 ms	76208 KB	Output is correct
19	Correct	18 ms	76376 KB	Output is correct
20	Correct	17 ms	78428 KB	Output is correct
21	Correct	17 ms	78428 KB	Output is correct
22	Correct	15 ms	78408 KB	Output is correct

Subtask #2
21.0 / 21.0

#	결과	실행 시간	메모리	Grader output
1	Correct	19 ms	78428 KB	Output is correct
2	Correct	16 ms	78684 KB	Output is correct
3	Correct	17 ms	76380 KB	Output is correct
4	Correct	15 ms	78312 KB	Output is correct
5	Correct	16 ms	78428 KB	Output is correct
6	Correct	16 ms	76388 KB	Output is correct
7	Correct	17 ms	78428 KB	Output is correct
8	Correct	16 ms	78428 KB	Output is correct
9	Correct	16 ms	78428 KB	Output is correct
10	Correct	15 ms	76380 KB	Output is correct
11	Correct	16 ms	76448 KB	Output is correct
12	Correct	15 ms	76464 KB	Output is correct
13	Correct	16 ms	78428 KB	Output is correct
14	Correct	16 ms	76376 KB	Output is correct
15	Correct	16 ms	76636 KB	Output is correct
16	Correct	16 ms	76424 KB	Output is correct
17	Correct	17 ms	78432 KB	Output is correct
18	Correct	16 ms	76208 KB	Output is correct
19	Correct	18 ms	76376 KB	Output is correct
20	Correct	17 ms	78428 KB	Output is correct
21	Correct	17 ms	78428 KB	Output is correct
22	Correct	15 ms	78408 KB	Output is correct
23	Correct	19 ms	82520 KB	Output is correct
24	Correct	19 ms	82524 KB	Output is correct
25	Correct	19 ms	82524 KB	Output is correct
26	Correct	20 ms	82520 KB	Output is correct
27	Correct	19 ms	82524 KB	Output is correct
28	Correct	19 ms	80476 KB	Output is correct
29	Correct	19 ms	80476 KB	Output is correct
30	Correct	20 ms	80584 KB	Output is correct
31	Correct	19 ms	80476 KB	Output is correct
32	Correct	20 ms	82780 KB	Output is correct
33	Correct	18 ms	82744 KB	Output is correct
34	Correct	19 ms	80732 KB	Output is correct
35	Correct	21 ms	82524 KB	Output is correct
36	Correct	19 ms	78456 KB	Output is correct
37	Correct	17 ms	78428 KB	Output is correct
38	Correct	18 ms	80732 KB	Output is correct
39	Correct	19 ms	82524 KB	Output is correct
40	Correct	19 ms	82780 KB	Output is correct
41	Correct	18 ms	82524 KB	Output is correct
42	Correct	19 ms	82520 KB	Output is correct
43	Correct	19 ms	82780 KB	Output is correct
44	Correct	19 ms	82524 KB	Output is correct

Subtask #3
65.0 / 65.0

#	결과	실행 시간	메모리	Grader output
1	Correct	19 ms	78428 KB	Output is correct
2	Correct	16 ms	78684 KB	Output is correct
3	Correct	17 ms	76380 KB	Output is correct
4	Correct	15 ms	78312 KB	Output is correct
5	Correct	16 ms	78428 KB	Output is correct
6	Correct	16 ms	76388 KB	Output is correct
7	Correct	17 ms	78428 KB	Output is correct
8	Correct	16 ms	78428 KB	Output is correct
9	Correct	16 ms	78428 KB	Output is correct
10	Correct	15 ms	76380 KB	Output is correct
11	Correct	16 ms	76448 KB	Output is correct
12	Correct	15 ms	76464 KB	Output is correct
13	Correct	16 ms	78428 KB	Output is correct
14	Correct	16 ms	76376 KB	Output is correct
15	Correct	16 ms	76636 KB	Output is correct
16	Correct	16 ms	76424 KB	Output is correct
17	Correct	17 ms	78432 KB	Output is correct
18	Correct	16 ms	76208 KB	Output is correct
19	Correct	18 ms	76376 KB	Output is correct
20	Correct	17 ms	78428 KB	Output is correct
21	Correct	17 ms	78428 KB	Output is correct
22	Correct	15 ms	78408 KB	Output is correct
23	Correct	19 ms	82520 KB	Output is correct
24	Correct	19 ms	82524 KB	Output is correct
25	Correct	19 ms	82524 KB	Output is correct
26	Correct	20 ms	82520 KB	Output is correct
27	Correct	19 ms	82524 KB	Output is correct
28	Correct	19 ms	80476 KB	Output is correct
29	Correct	19 ms	80476 KB	Output is correct
30	Correct	20 ms	80584 KB	Output is correct
31	Correct	19 ms	80476 KB	Output is correct
32	Correct	20 ms	82780 KB	Output is correct
33	Correct	18 ms	82744 KB	Output is correct
34	Correct	19 ms	80732 KB	Output is correct
35	Correct	21 ms	82524 KB	Output is correct
36	Correct	19 ms	78456 KB	Output is correct
37	Correct	17 ms	78428 KB	Output is correct
38	Correct	18 ms	80732 KB	Output is correct
39	Correct	19 ms	82524 KB	Output is correct
40	Correct	19 ms	82780 KB	Output is correct
41	Correct	18 ms	82524 KB	Output is correct
42	Correct	19 ms	82520 KB	Output is correct
43	Correct	19 ms	82780 KB	Output is correct
44	Correct	19 ms	82524 KB	Output is correct
45	Correct	947 ms	106440 KB	Output is correct
46	Correct	933 ms	106124 KB	Output is correct
47	Correct	928 ms	105996 KB	Output is correct
48	Correct	881 ms	106068 KB	Output is correct
49	Correct	928 ms	105560 KB	Output is correct
50	Correct	862 ms	105708 KB	Output is correct
51	Correct	948 ms	105764 KB	Output is correct
52	Correct	961 ms	106100 KB	Output is correct
53	Correct	928 ms	106156 KB	Output is correct
54	Correct	885 ms	118400 KB	Output is correct
55	Correct	865 ms	119768 KB	Output is correct
56	Correct	789 ms	117532 KB	Output is correct
57	Correct	783 ms	116448 KB	Output is correct
58	Correct	245 ms	103224 KB	Output is correct
59	Correct	220 ms	103484 KB	Output is correct
60	Correct	327 ms	129528 KB	Output is correct
61	Correct	614 ms	108112 KB	Output is correct
62	Correct	1032 ms	121748 KB	Output is correct
63	Correct	670 ms	107184 KB	Output is correct
64	Correct	639 ms	108060 KB	Output is correct
65	Correct	779 ms	122172 KB	Output is correct
66	Correct	712 ms	107044 KB	Output is correct

답안 #916097

Compilation message

Subtask #1 14.0 / 14.0

Subtask #2 21.0 / 21.0

Subtask #3 65.0 / 65.0

Subtask #1
14.0 / 14.0

Subtask #2
21.0 / 21.0

Subtask #3
65.0 / 65.0