oj.uz

답안 #943728

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
943728 2024-03-11T18:45:23 Z Pannda Fish 2 (JOI22_fish2) C++17
43 / 100
 1858 ms 20524 KB 
#include <bits/stdc++.h>
using namespace std;

struct Paint {
    struct Node {
        int mn, cnt;
        int lazy = 0;
        void add(int delta) {
            mn += delta;
            lazy += delta;
        }
        void merge(Node a, Node b) {
            mn = min(a.mn, b.mn);
            cnt = 0;
            if (a.mn == mn) cnt += a.cnt;
            if (b.mn == mn) cnt += b.cnt;
        }
    };

    int n;
    vector<Node> nodes;

    Paint(int n) : n(n), nodes(4 * n) {
        auto dfs = [&](auto self, int idx, int l, int r) -> void {
            if (l + 1 == r) {
                nodes[idx].mn = 0;
                nodes[idx].cnt = 1;
            } else {
                int m = (l + r) >> 1;
                self(self, 2 * idx + 1, l, m);
                self(self, 2 * idx + 2, m, r);
                nodes[idx].merge(nodes[2 * idx + 1], nodes[2 * idx + 2]);
            }
        };
        dfs(dfs, 0, 0, n);
    }

    void down(int idx) {
        nodes[2 * idx + 1].add(nodes[idx].lazy);
        nodes[2 * idx + 2].add(nodes[idx].lazy);
        nodes[idx].lazy = 0;
    }

    void add(int ql, int qr, int delta) {
        auto dfs = [&](auto self, int idx, int l, int r) -> void {
            if (r <= ql || qr <= l) return;
            if (ql <= l && r <= qr) return nodes[idx].add(delta);
            down(idx);
            int m = (l + r) >> 1;
            self(self, 2 * idx + 1, l, m);
            self(self, 2 * idx + 2, m, r);
            nodes[idx].merge(nodes[2 * idx + 1], nodes[2 * idx + 2]);
        };
        dfs(dfs, 0, 0, n);
    }

    int countZero(int ql, int qr) {
        int fetch = 0;
        auto dfs = [&](auto self, int idx, int l, int r) -> void {
            if (r <= ql || qr <= l) return;
            if (ql <= l && r <= qr) {
                fetch += nodes[idx].mn == 0 ? nodes[idx].cnt : 0;
                return;
            }
            down(idx);
            int m = (l + r) >> 1;
            self(self, 2 * idx + 1, l, m);
            self(self, 2 * idx + 2, m, r);
        };
        dfs(dfs, 0, 0, n);
        return fetch;
    }
};

struct SegmentWalk {
    int n;
    vector<int> mx;

    SegmentWalk(int n) : n(n), mx(4 * n, 0) {}

    void set(int i, int val) {
        auto dfs = [&](auto self, int idx, int l, int r) -> void {
            if (l + 1 == r) {
                mx[idx] = val;
            } else {
                int m = (l + r) >> 1;
                if (i < m) self(self, 2 * idx + 1, l, m);
                else self(self, 2 * idx + 2, m, r);
                mx[idx] = max(mx[2 * idx + 1], mx[2 * idx + 2]);
            }
        };
        dfs(dfs, 0, 0, n);
    }

    int walk(int ql, int qr, long long bound, bool request_leftmost) { // in [ql, qr), returns the leftmost (rightmost) position with value > 'bound'
        auto dfs = [&](auto self, int idx, int l, int r) -> int {
            if (r <= ql || qr <= l || mx[idx] <= bound) return -1;
            if (ql <= l && r <= qr) {
                while (l + 1 < r) {
                    int m = (l + r) >> 1;
                    if (request_leftmost) {
                        if (mx[2 * idx + 1] > bound) idx = 2 * idx + 1, r = m;
                        else idx = 2 * idx + 2, l = m;
                    } else {
                        if (mx[2 * idx + 2] > bound) idx = 2 * idx + 2, l = m;
                        else idx = 2 * idx + 1, r = m;
                    }
                }
                return l;
            }
            int m = (l + r) >> 1;
            if (request_leftmost) {
                int get = self(self, 2 * idx + 1, l, m);
                if (get != -1) return get;
                return self(self, 2 * idx + 2, m, r);
            } else {
                int get = self(self, 2 * idx + 2, m, r);
                if (get != -1) return get;
                return self(self, 2 * idx + 1, l, m);
            }
        };
        return dfs(dfs, 0, 0, n);
    }
};

struct Fenwick {
    int n;
    vector<long long> bit;

    Fenwick(int n) : n(n), bit(n + 1, 0) {}

    void add(int i, int delta) {
        for (i++; i <= n; i += i & -i) bit[i] += delta;
    }

    long long sum(int i) {
        long long res = 0;
        for (; i > 0; i -= i & -i) res += bit[i];
        return res;
    }

    long long sum(int l, int r) {
        return sum(r) - sum(l);
    }
};

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
//    freopen("inp.inp", "r", stdin);
//    freopen("out.out", "w", stdout);

    int n;
    cin >> n;

    vector<int> a(n);
    Fenwick fen(n);
    SegmentWalk segwalk(n);

    for (int i = 0; i < n; i++) {
        cin >> a[i];
        fen.add(i, a[i]);
        segwalk.set(i, a[i]);
    }

    auto findSaturatedInterval = [&](int ql, int qr, int &l, int &r, long long &sum) -> void { // O(log^2), find the tightest saturated interval (or [l, r)) containing the initial interval [l, r)
        while (ql < l || r < qr) {
            long long old_sum = sum;
            if (ql < l) {
                int p = segwalk.walk(ql, l, sum, false);
                if (p == -1) {
                    sum += fen.sum(ql, l);
                    l = ql;
                } else {
                    sum += fen.sum(p + 1, l);
                    l = p + 1;
                    if (sum >= a[p]) {
                        sum += a[p];
                        l = p;
                    }
                }
            }
            if (r < qr) {
                int p = segwalk.walk(r, qr, sum, true);
                if (p == -1) {
                    sum += fen.sum(r, qr);
                    r = qr;
                } else {
                    sum += fen.sum(r, p);
                    r = p;
                    if (sum >= a[p]) {
                        sum += a[p];
                        r = p + 1;
                    }
                }
            }
            if (sum == old_sum) break;
        }
    };

    auto findAllSaturatedIntervals = [&](int ql, int qr, int i) -> vector<array<int, 2>> { // O(log^2), find all saturated intervals containing i
        vector<array<int, 2>> res;
        int l = i, r = i + 1;
        long long sum = a[i];
        while (true) {
            findSaturatedInterval(ql, qr, l, r, sum);
            if (l == ql && r == qr) break;
            res.push_back({l, r});
            if (l == ql || (r < qr && a[r] <= a[l - 1])) {
                sum += a[r];
                r = r + 1;
            } else {
                sum += a[l - 1];
                l = l - 1;
            }
        }
        return res;
    };

    Paint paint(n);
    SegmentWalk wow(n);
    vector<set<int>> why(n);

    auto erase = [&](int ql, int qr) -> vector<array<int, 2>> { // erases all intervals containing [ql, qr), return the set of deleted intervals
        vector<array<int, 2>> res;
        while (true) {
            int l = wow.walk(0, ql + 1, qr - 1, true);
            if (l == -1) break;
            int r = *why[l].rbegin();
            res.push_back({l, r});
            paint.add(l, r, -1);
            why[l].erase(r);
            if (why[l].empty()) wow.set(l, 0);
            else wow.set(l, *why[l].rbegin());
        }
        return res;
    };

    auto insert = [&](int l, int r) -> void {
        if (why[l].count(r)) return;
        why[l].insert(r);
        wow.set(l, *why[l].rbegin());
        paint.add(l, r, +1);
    };

    for (int i = 0; i < n; i++) {
        int l = i, r = i + 1;
        long long sum = a[i];
        findSaturatedInterval(0, n, l, r, sum);
        if (l != 0 || r != n) insert(l, r);
    }

    int q;
    cin >> q;
    while (q--) {
        int type;
        cin >> type;
        if (type == 1) {
            int i, x;
            cin >> i >> x;
            i--;
            auto subinsert = [&](int i) -> void {
                if (i < 0 || i >= n) return;
                for (auto [l, r] : findAllSaturatedIntervals(0, n, i)) insert(l, r);
            };
            erase(i - 1, i);
            erase(i, i + 1);
            erase(i + 1, i + 2);
            fen.add(i, -a[i] + x);
            a[i] = x;
            segwalk.set(i, x);
            subinsert(i - 1);
            subinsert(i);
            subinsert(i + 1);
        }
        if (type == 2) {
            int l, r;
            cin >> l >> r;
            l--;

            // assumes l = 0 and r = n (subtask 5)
            cout << paint.countZero(0, n) << '\n';
        }
    }
}

Subtask #1
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 0 ms 344 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
8.0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 756 KB Output is correct
2 Correct 128 ms 18152 KB Output is correct
3 Correct 111 ms 17480 KB Output is correct
4 Correct 119 ms 18148 KB Output is correct
5 Correct 111 ms 17744 KB Output is correct
6 Correct 77 ms 15956 KB Output is correct
7 Correct 127 ms 15180 KB Output is correct
8 Correct 71 ms 15948 KB Output is correct
9 Correct 120 ms 15188 KB Output is correct
10 Correct 106 ms 15784 KB Output is correct
11 Correct 91 ms 15744 KB Output is correct
12 Correct 88 ms 15956 KB Output is correct
13 Correct 87 ms 15780 KB Output is correct
14 Correct 91 ms 17296 KB Output is correct
15 Correct 111 ms 17024 KB Output is correct

Subtask #3
0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 0 ms 344 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 756 KB Output is correct
2 Correct 128 ms 18152 KB Output is correct
3 Correct 111 ms 17480 KB Output is correct
4 Correct 119 ms 18148 KB Output is correct
5 Correct 111 ms 17744 KB Output is correct
6 Correct 77 ms 15956 KB Output is correct
7 Correct 127 ms 15180 KB Output is correct
8 Correct 71 ms 15948 KB Output is correct
9 Correct 120 ms 15188 KB Output is correct
10 Correct 106 ms 15784 KB Output is correct
11 Correct 91 ms 15744 KB Output is correct
12 Correct 88 ms 15956 KB Output is correct
13 Correct 87 ms 15780 KB Output is correct
14 Correct 91 ms 17296 KB Output is correct
15 Correct 111 ms 17024 KB Output is correct
16 Incorrect 0 ms 344 KB Output isn't correct
17 Halted 0 ms 0 KB -

Subtask #5
35.0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 756 KB Output is correct
2 Correct 128 ms 18152 KB Output is correct
3 Correct 111 ms 17480 KB Output is correct
4 Correct 119 ms 18148 KB Output is correct
5 Correct 111 ms 17744 KB Output is correct
6 Correct 77 ms 15956 KB Output is correct
7 Correct 127 ms 15180 KB Output is correct
8 Correct 71 ms 15948 KB Output is correct
9 Correct 120 ms 15188 KB Output is correct
10 Correct 106 ms 15784 KB Output is correct
11 Correct 91 ms 15744 KB Output is correct
12 Correct 88 ms 15956 KB Output is correct
13 Correct 87 ms 15780 KB Output is correct
14 Correct 91 ms 17296 KB Output is correct
15 Correct 111 ms 17024 KB Output is correct
16 Correct 1 ms 344 KB Output is correct
17 Correct 1810 ms 19708 KB Output is correct
18 Correct 1004 ms 20224 KB Output is correct
19 Correct 1255 ms 19168 KB Output is correct
20 Correct 850 ms 20036 KB Output is correct
21 Correct 1858 ms 19588 KB Output is correct
22 Correct 1025 ms 20524 KB Output is correct
23 Correct 1625 ms 19300 KB Output is correct
24 Correct 908 ms 20048 KB Output is correct
25 Correct 1429 ms 19192 KB Output is correct
26 Correct 404 ms 18848 KB Output is correct
27 Correct 490 ms 18708 KB Output is correct
28 Correct 707 ms 18760 KB Output is correct
29 Correct 410 ms 18808 KB Output is correct
30 Correct 490 ms 18668 KB Output is correct
31 Correct 755 ms 18768 KB Output is correct
32 Correct 1032 ms 19692 KB Output is correct
33 Correct 617 ms 17488 KB Output is correct
34 Correct 885 ms 20084 KB Output is correct
35 Correct 527 ms 17732 KB Output is correct
36 Correct 772 ms 19476 KB Output is correct
37 Correct 759 ms 18772 KB Output is correct
38 Correct 521 ms 19168 KB Output is correct
39 Correct 452 ms 19540 KB Output is correct
40 Correct 229 ms 19304 KB Output is correct

Subtask #6
0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 0 ms 344 KB Output isn't correct
2 Halted 0 ms 0 KB -