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답안 #876500

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
876500 2023-11-21T20:42:44 Z danikoynov Fish 2 (JOI22_fish2) C++14
31 / 100
 4000 ms 56172 KB 
#include<bits/stdc++.h>
#define endl '\n'

using namespace std;

typedef long long ll;

const int maxn = 1e5 + 10;


int n, q;
ll a[maxn], pref[maxn];
void input()
{
    cin >> n;
    for (int i = 1; i <= n; i ++)
        cin >> a[i];
    cin >> q;
    a[0] = 1e9 + 10;
    a[n + 1] = 1e9 + 10;

}

struct interval
{
    int left, right, pivot;

    interval(int _left = 0, int _right = 0, int _pivot = 0)
    {
        left = _left;
        right = _right;
        pivot = _pivot;
    }
    bool operator < (const interval &it) const
    {
        if (left != it.left)
            return left < it.left;
        if (right != it.right)
            return right < it.right;
        ///assert(pivot != it.pivot);
        return pivot < it.pivot;
    }
};

set < interval > ranges;
vector < interval > act[4 * maxn];

void add_range(int root, int left, int right, int qleft, int qright, interval cur)
{
    if (left > qright || right < qleft)
        return;

    if (left >= qleft && right <= qright)
    {
        //cout << "ROOT " << root << endl;
        act[root].push_back(cur);

        return;
    }

    int mid = (left + right) / 2;
    add_range(root * 2, left, mid, qleft, qright, cur);
    add_range(root * 2 + 1, mid + 1, right, qleft, qright, cur);
}

void rem_range(int root, int left, int right, int qleft, int qright, interval cur)
{
    if (left > qright || right < qleft)
        return;

    if (left >= qleft && right <= qright)
    {
        /**if (act[root].back().left != cur.left || act[root].back().right != cur.right ||
                act[root].back().pivot != cur.pivot)
        {
            cout << "Alert!!!" << endl;
            cout << act[root].back().left <<  " : " << act[root].back().right << " : " << act[root].back().pivot << endl;
            exit(0);
        }*/
        //if (act[root].size() == 0)
          //  cout << "FUCK " << root << endl;
        assert(act[root].size() > 0);
        act[root].pop_back();
        return;
    }

    int mid = (left + right) / 2;
    rem_range(root * 2, left, mid, qleft, qright, cur);
    rem_range(root * 2 + 1, mid + 1, right, qleft, qright, cur);
}

bool cmp_interval(const interval &it1, const interval &it2)
{
    if ((it1.right - it1.left) != (it2.right - it2.left))
        return (it1.right - it1.left) < (it2.right - it2.left);
    if (it1.left != it2.left)
        return it1.left < it2.left;

    if (it1.pivot == it2.pivot && (it1.right - it1.left) > 0)
        while(true);
    return (it1.pivot < it2.pivot);
}

void get_ranges()
{
    ranges.clear();
    stack < int > st;
    st.push(0);
    vector < interval > vec;
    for (int i = 1; i <= n; i ++)
    {
        while(!st.empty() && a[st.top()] < a[i])
            st.pop();

        ranges.insert(interval(st.top(), i, i));
        vec.push_back(interval(st.top(), i, i));


        st.push(i);
    }

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

        ranges.insert(interval(i, st.top(), i));
        vec.push_back(interval(i, st.top(), i));

        st.push(i);
    }

    sort(vec.begin(), vec.end(), cmp_interval);
    ///reverse(vec.begin(), vec.end());
    for (interval cur : vec)
    {
        //cout << "added " << cur.left << " " << cur.right << endl;
        add_range(1, 0, n + 1, cur.left, cur.right, cur);
    }
}

int b[maxn];

struct node
{
    int cnt, mx;

    node(int _cnt = 0, int _mx = 1e9 + 10)
    {
        cnt = _cnt;
        mx = _mx;
    }
};

node tree[4 * maxn];
int lazy[4 * maxn];

node merge_node(node lf, node rf)
{
    if (lf.cnt == -1 || rf.mx < lf.mx)
        return rf;
    if (rf.cnt == -1 || lf.mx < rf.mx)
        return lf;

    return node(lf.cnt + rf.cnt, lf.mx);
}

void push_lazy(int root, int left, int right)
{
    tree[root].mx += lazy[root];
    if (left != right)
    {
        lazy[root * 2] += lazy[root];
        lazy[root * 2 + 1] += lazy[root];
    }
    lazy[root] = 0;
}

void build_tree(int root, int left, int right)
{
    lazy[root] = 0;
    if (left == right)
    {
        tree[root].mx = b[left];
        tree[root].cnt = 1;
        return;
    }

    int mid = (left + right) / 2;
    build_tree(root * 2, left, mid);
    build_tree(root * 2 + 1, mid + 1, right);

    tree[root] = merge_node(tree[root * 2], tree[root * 2 + 1]);
}

void update_range(int root, int left, int right, int qleft, int qright, int val)
{
    push_lazy(root, left, right);
    if (left > qright || right < qleft)
        return;

    if (left >= qleft && right <= qright)
    {
        lazy[root] = val;
        push_lazy(root, left, right);
        return;
    }

    int mid = (left + right) / 2;
    update_range(root * 2, left, mid, qleft, qright, val);
    update_range(root * 2 + 1, mid + 1, right, qleft, qright, val);

    tree[root] = merge_node(tree[root * 2], tree[root * 2 + 1]);
}
node query(int root, int left, int right, int qleft, int qright)
{
    push_lazy(root, left, right);
    if (left > qright || right < qleft)
        return node(-1, 1e9 + 10);

    if (left >= qleft && right <= qright)
        return tree[root];

    int mid = (left + right) / 2;

    return merge_node(query(root * 2, left, mid, qleft, qright),
            query(root * 2 + 1, mid + 1, right, qleft, qright));
}

ll values[maxn];

struct segment_tree
{
    ll tree[4 * maxn], lazy[4 * maxn];


    void build_tree(int root, int left, int right)
    {
        lazy[root] = 0;
        if (left == right)
        {
            tree[root] = values[left];
            return;
        }

        int mid = (left + right) / 2;
        build_tree(root * 2, left, mid);
        build_tree(root * 2 + 1, mid + 1, right);

        tree[root] = max(tree[root * 2], tree[root * 2 + 1]);
    }

    void push_lazy(int root, int left, int right)
    {
        tree[root] += lazy[root];
        if (left != right)
        {
            lazy[root * 2] += lazy[root];
            lazy[root * 2 + 1] += lazy[root];
        }

        lazy[root] = 0;
    }

    void update_range(int root, int left, int right, int qleft, int qright, ll val)
    {
        push_lazy(root, left, right);
        if (left > qright || right < qleft)
            return;

        if (left >= qleft && right <= qright)
        {
            lazy[root] += val;
            push_lazy(root, left, right);
            return;
        }

        int mid = (left + right) / 2;
        update_range(root * 2, left, mid, qleft, qright, val);
        update_range(root * 2 + 1, mid + 1, right, qleft, qright, val);

        tree[root] = max(tree[root * 2], tree[root * 2 + 1]);
    }

    ll walk_left(int root, int left, int right, int qleft, int qright, ll val)
    {
        push_lazy(root, left, right);
        if (left > qright || right < qleft || tree[root] <= val)
            return n + 1;

        if (left == right)
            return left;

        int mid = (left + right) / 2;
        if (left >= qleft && right <= qright)
        {
            push_lazy(root * 2, left, mid);
            push_lazy(root * 2 + 1, mid + 1, right);
            if (tree[root * 2] > val)
                return walk_left(root * 2, left, mid, qleft, qright, val);
            return walk_left(root * 2 + 1, mid + 1, right, qleft, qright, val);
        }

        return min(walk_left(root * 2, left, mid, qleft, qright, val),
                walk_left(root * 2 + 1, mid + 1, right, qleft, qright, val));
    }

    ll walk_right(int root, int left, int right, int qleft, int qright, ll val)
    {
        push_lazy(root, left, right);
        if (left > qright || right < qleft || tree[root] <= val)
            return 0;

        if (left == right)
            return left;

        int mid = (left + right) / 2;
        if (left >= qleft && right <= qright)
        {
            push_lazy(root * 2, left, mid);
            push_lazy(root * 2 + 1, mid + 1, right);
            if (tree[root * 2 + 1] > val)
                    return walk_right(root * 2 + 1, mid + 1, right, qleft, qright, val);
            return walk_right(root * 2, left, mid, qleft, qright, val);
        }

        return max(walk_right(root * 2, left, mid, qleft, qright, val),
                walk_right(root * 2 + 1, mid + 1, right, qleft, qright, val));
    }
};

segment_tree left_tree, right_tree;

ll fen[maxn];

void update_fen(int pos, ll val)
{
    for (int i = pos; i <= n; i += (i & -i))
        fen[i] += val;
}

ll query_fen(int pos)
{
    ll s = 0;
    for (int i = pos; i > 0; i -= (i & -i))
        s += fen[i];
    return s;
}

ll range_sum(int left, int right)
{
    return query_fen(right) - query_fen(left - 1);
}

void solve_query(int left, int right)
{
    int lb = left_tree.walk_right(1, 1, n, left, right, - query_fen(left - 1));
    int rb = right_tree.walk_left(1, 1, n, left, right, query_fen(right));


    cout << query(1, 1, n, lb, rb).cnt << endl;
}

void restructure()
{
    ///cout << "-------------" << endl;

    build_tree(1, 1, n);
    for (interval cur : ranges)
    {
        ll mx = min(a[cur.left], a[cur.right]);
        if (range_sum(cur.left + 1, cur.right - 1) < mx)
        {
            update_range(1, 1, n, cur.left + 1, cur.right - 1, 1);
            ///cout << cur.left << " " << cur.right << endl;
            //for (int i = cur.left + 1; i < cur.right; i ++)
              //  b[i] ++;
        }
    }
}



void fix_point(int pos)
{

    vector < pair < int, int > > to_fix;
    int root = 1, left = 0, right = n + 1;
    vector < interval > to_rem;
    while(true)
    {
        for (interval cur : act[root])
        {
            to_rem.push_back(cur);
            if (cur.pivot == cur.left)
                to_fix.push_back({cur.pivot, 0});
            else
                to_fix.push_back({cur.pivot, 1});
        }
        if (left == right)
            break;
        int mid = (left + right) / 2;
        if (pos <= mid)
            right = mid, root *= 2;
        else
            left = mid + 1, root = (root * 2) + 1;
    }

    sort(to_rem.begin(), to_rem.end(), cmp_interval);
    reverse(to_rem.begin(), to_rem.end());
    for (interval cur : to_rem)
    {
        //cout << "remove " << cur.left << " " << cur.right << endl;
       // if (ranges.find(cur) == ranges.end())
          //  cout << "yep" << endl;
        ranges.erase(cur);
        rem_range(1, 0, n + 1, cur.left, cur.right, cur);
    }



    vector < interval > to_add;
    for (pair < int, int > cur : to_fix)
    {
        if (cur.second == 0)
        {
            int df = cur.first + 1;
            while(a[df] < a[cur.first])
                df ++;
            to_add.push_back(interval(cur.first, df, cur.first));
        }
        else
        {
            int df = cur.first - 1;
            while(a[df] < a[cur.first])
                df --;
            to_add.push_back(interval(df, cur.first, cur.first));
        }
    }

    sort(to_add.begin(), to_add.end(), cmp_interval);
    ///reverse(to_add.begin(), to_add.end());
    for (interval cur : to_add)
    {
        ranges.insert(cur);
        ///cout << "added " << cur.left << " : " << cur.right << endl;
        add_range(1, 0, n + 1, cur.left, cur.right, cur);
    }
}
void simulate()
{
    for (int i = 1; i <= n; i ++)
        update_fen(i, a[i]);
    get_ranges();
    restructure();

    for (int i = 1; i <= n; i ++)
    {
        values[i] = a[i] - query_fen(i - 1);
    }
    left_tree.build_tree(1, 1, n);

    for (int i = 1; i <= n; i ++)
    {
        values[i] = a[i] + query_fen(i);
    }
    right_tree.build_tree(1, 1, n);
    for (int i = 1; i <= q; i ++)
    {
        int type;
        cin >> type;
        if (type == 1)
        {
            int idx;
            ll x;
            cin >> idx >> x;
            update_fen(idx, x - a[idx]);
            left_tree.update_range(1, 1, n, idx + 1, n, - (x - a[idx]));
            left_tree.update_range(1, 1, n, idx, idx, (x - a[idx]));
            right_tree.update_range(1, 1, n, idx, n, (x - a[idx]));
            right_tree.update_range(1, 1, n, idx, idx, (x - a[idx]));
            a[idx] = x;
            fix_point(idx);
            restructure();
        }
        else
        {
            int l, r;
            cin >> l >> r;
            solve_query(l, r);
        }
    }
}
void solve()
{
    input();
    simulate();
}

void speed()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
}
int main()
{
    speed();
    solve();
    return 0;
}
/*
12
32 32 4 1 1 1 1 4 4 16 32 128
1
2 8 10

*/

Subtask #1
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 24924 KB Output is correct
2 Correct 4 ms 24924 KB Output is correct
3 Correct 4 ms 24924 KB Output is correct
4 Correct 4 ms 24924 KB Output is correct
5 Correct 60 ms 25232 KB Output is correct
6 Execution timed out 4064 ms 25180 KB Time limit exceeded
7 Halted 0 ms 0 KB -

Subtask #2
8.0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 24924 KB Output is correct
2 Correct 164 ms 52596 KB Output is correct
3 Correct 164 ms 52496 KB Output is correct
4 Correct 164 ms 52728 KB Output is correct
5 Correct 166 ms 52628 KB Output is correct
6 Correct 149 ms 52416 KB Output is correct
7 Correct 147 ms 51140 KB Output is correct
8 Correct 144 ms 52160 KB Output is correct
9 Correct 148 ms 51136 KB Output is correct
10 Correct 168 ms 55888 KB Output is correct
11 Correct 159 ms 52848 KB Output is correct
12 Correct 144 ms 52016 KB Output is correct
13 Correct 155 ms 51880 KB Output is correct
14 Correct 143 ms 51908 KB Output is correct
15 Correct 151 ms 51640 KB Output is correct

Subtask #3
0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 24924 KB Output is correct
2 Correct 4 ms 24924 KB Output is correct
3 Correct 4 ms 24924 KB Output is correct
4 Correct 4 ms 24924 KB Output is correct
5 Correct 60 ms 25232 KB Output is correct
6 Execution timed out 4064 ms 25180 KB Time limit exceeded
7 Halted 0 ms 0 KB -

Subtask #4
23.0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 24924 KB Output is correct
2 Correct 164 ms 52596 KB Output is correct
3 Correct 164 ms 52496 KB Output is correct
4 Correct 164 ms 52728 KB Output is correct
5 Correct 166 ms 52628 KB Output is correct
6 Correct 149 ms 52416 KB Output is correct
7 Correct 147 ms 51140 KB Output is correct
8 Correct 144 ms 52160 KB Output is correct
9 Correct 148 ms 51136 KB Output is correct
10 Correct 168 ms 55888 KB Output is correct
11 Correct 159 ms 52848 KB Output is correct
12 Correct 144 ms 52016 KB Output is correct
13 Correct 155 ms 51880 KB Output is correct
14 Correct 143 ms 51908 KB Output is correct
15 Correct 151 ms 51640 KB Output is correct
16 Correct 4 ms 24924 KB Output is correct
17 Correct 342 ms 52944 KB Output is correct
18 Correct 309 ms 52660 KB Output is correct
19 Correct 330 ms 52996 KB Output is correct
20 Correct 326 ms 52996 KB Output is correct
21 Correct 319 ms 52928 KB Output is correct
22 Correct 301 ms 52764 KB Output is correct
23 Correct 316 ms 52684 KB Output is correct
24 Correct 322 ms 52952 KB Output is correct
25 Correct 314 ms 52936 KB Output is correct
26 Correct 325 ms 52848 KB Output is correct
27 Correct 278 ms 52672 KB Output is correct
28 Correct 278 ms 52928 KB Output is correct
29 Correct 273 ms 52844 KB Output is correct
30 Correct 305 ms 51344 KB Output is correct
31 Correct 297 ms 51528 KB Output is correct
32 Correct 338 ms 52932 KB Output is correct
33 Correct 308 ms 56172 KB Output is correct
34 Correct 330 ms 52936 KB Output is correct
35 Correct 310 ms 52420 KB Output is correct
36 Correct 320 ms 56000 KB Output is correct
37 Correct 281 ms 52168 KB Output is correct
38 Correct 267 ms 52064 KB Output is correct
39 Correct 274 ms 52356 KB Output is correct
40 Correct 276 ms 52364 KB Output is correct

Subtask #5
0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 24924 KB Output is correct
2 Correct 164 ms 52596 KB Output is correct
3 Correct 164 ms 52496 KB Output is correct
4 Correct 164 ms 52728 KB Output is correct
5 Correct 166 ms 52628 KB Output is correct
6 Correct 149 ms 52416 KB Output is correct
7 Correct 147 ms 51140 KB Output is correct
8 Correct 144 ms 52160 KB Output is correct
9 Correct 148 ms 51136 KB Output is correct
10 Correct 168 ms 55888 KB Output is correct
11 Correct 159 ms 52848 KB Output is correct
12 Correct 144 ms 52016 KB Output is correct
13 Correct 155 ms 51880 KB Output is correct
14 Correct 143 ms 51908 KB Output is correct
15 Correct 151 ms 51640 KB Output is correct
16 Correct 4 ms 24924 KB Output is correct
17 Execution timed out 4088 ms 52832 KB Time limit exceeded
18 Halted 0 ms 0 KB -

Subtask #6
0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 24924 KB Output is correct
2 Correct 4 ms 24924 KB Output is correct
3 Correct 4 ms 24924 KB Output is correct
4 Correct 4 ms 24924 KB Output is correct
5 Correct 60 ms 25232 KB Output is correct
6 Execution timed out 4064 ms 25180 KB Time limit exceeded
7 Halted 0 ms 0 KB -