oj.uz

답안 #600852

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
600852 2022-07-21T08:26:06 Z KoD Fish 2 (JOI22_fish2) C++17
31 / 100
 561 ms 17692 KB 
#include <bits/stdc++.h>

using ll = long long;
using std::pair;
using std::vector;

class Sequence {
    struct Data {
        int max;
        ll sum;
        static Data identity() {
            return {0, 0};
        }
        static Data make(const int x) {
            return {x, x};
        }
        friend Data operator+(const Data& l, const Data& r) {
            return {std::max(l.max, r.max), l.sum + r.sum};
        }
    };

    int size, logn;
    vector<Data> data;

  public:
    explicit Sequence(const vector<int>& vec) {
        logn = 0;
        while ((1 << logn) < (int)vec.size()) {
            logn += 1;
        }
        size = 1 << logn;
        data.resize(2 * size, Data::identity());
        for (int i = 0; i < (int)vec.size(); ++i) {
            data[size + i] = Data::make(vec[i]);
        }
        for (int i = size - 1; i > 0; --i) {
            data[i] = data[2 * i] + data[2 * i + 1];
        }
    }

    void update(int i, const int x) {
        i += size;
        data[i] = Data::make(x);
        while (i > 1) {
            i >>= 1;
            data[i] = data[2 * i] + data[2 * i + 1];
        }
    }

    ll sum(int l, int r) const {
        l += size;
        r += size;
        ll ret = 0;
        while (l < r) {
            if (l & 1) {
                ret += data[l].sum;
                l += 1;
            }
            if (r & 1) {
                r -= 1;
                ret += data[r].sum;
            }
            l >>= 1;
            r >>= 1;
        }
        return ret;
    }

    int upb_to_right(int l, const ll x) {
        if (l == size) return -1;
        l += size;
        do {
            while (!(l & 1)) l >>= 1;
            if (data[l].max > x) {
                while (l < size) {
                    l <<= 1;
                    if (data[l].max <= x) {
                        l += 1;
                    }
                }
                return l - size;
            }
            l >>= 1;
            l += 1;
        } while (l & (l - 1));
        return -1;
    }

    int upb_to_left(int r, const ll x) {
        if (r == 0) return -1;
        r += size;
        do {
            while (!(r & 1)) r >>= 1;
            r -= 1;
            if (data[r].max > x) {
                while (r < size) {
                    r <<= 1;
                    if (data[r + 1].max > x) {
                        r += 1;
                    }
                }
                return r - size;
            }
            r >>= 1;
        } while (r & (r - 1));
        return -1;
    }
};

class Intervals {
    int size, logn;
    vector<vector<pair<int, int>>> data;

  public:
    explicit Intervals(const int n) {
        logn = 0;
        while ((1 << logn) < n) {
            logn += 1;
        }
        size = 1 << logn;
        data.resize(2 * size);
    }

    void add(const int l, const int r) {
        int i = l + size, j = l + size + 1, k = 1;
        while (j < r) {
            if (!(i & 1)) {
                j += k;
            }
            i >>= 1;
            k <<= 1;
        }
        data[i].emplace_back(l, r);
    }

    template <class F>
    void pop(const int k, const F& f) {
        int i = k + size;
        while (i > 0) {
            while (!data[i].empty()) {
                const auto& [l, r] = data[i].back();
                if (l <= i and i < r) {
                    f(l, r);
                    data[i].pop_back();
                } else {
                    break;
                }
            }
            i >>= 1;
        }
    }
};

class SegmentTree {
    struct Data {
        int min, cnt;
        static Data identity() {
            return {1000000000, 0};
        }
        static Data make(const int x) {
            return {x, 1};
        }
        friend Data operator+(const Data& l, const Data& r) {
            const int m = std::min(l.min, r.min);
            return {m, (l.min == m ? l.cnt : 0) + (r.min == m ? r.cnt : 0)};
        }
    };

    int size, logn;
    vector<Data> data;
    vector<int> add;

    void apply(const int k, const int a) {
        data[k].min += a;
        if (k < size) {
            add[k] += a;
        }
    }
    void flush(const int k) {
        if (add[k] != 0) {
            apply(2 * k, add[k]);
            apply(2 * k + 1, add[k]);
            add[k] = 0;
        }
    }
    void push(const int k) {
        const int lsb = __builtin_ctz(k);
        for (int d = logn; d > lsb; --d) {
            flush(k >> d);
        }
    }

    void fetch(const int k) {
        data[k] = data[2 * k] + data[2 * k + 1];
    }
    void pull(int k) {
        k >>= __builtin_ctz(k);
        while (k > 1) {
            fetch(k >>= 1);
        }
    }

  public:
    explicit SegmentTree(const int n) {
        logn = 0;
        while ((1 << logn) < n) {
            logn += 1;
        }
        size = 1 << logn;
        data.resize(2 * size, Data::identity());
        for (int i = 0; i < n; ++i) {
            data[size + i] = Data::make(0);
        }
        for (int i = size - 1; i > 0; --i) {
            data[i] = data[2 * i] + data[2 * i + 1];
        }
        add.resize(size);
    }

    void operate(int l, int r, const int x) {
        l += size;
        r += size;
        push(l);
        push(r);
        const int lc = l, rc = r;
        while (l < r) {
            if (l & 1) {
                apply(l, x);
                l += 1;
            }
            if (r & 1) {
                r -= 1;
                apply(r, x);
            }
            l >>= 1;
            r >>= 1;
        }
        pull(lc);
        pull(rc);
    }

    int fold(int l, int r) {
        l += size;
        r += size;
        push(l);
        push(r);
        Data ret = Data::identity();
        while (l < r) {
            if (l & 1) {
                ret = ret + data[l];
                l += 1;
            }
            if (r & 1) {
                r -= 1;
                ret = data[r] + ret;
            }
            l >>= 1;
            r >>= 1;
        }
        return ret.cnt;
    }
};

int main() {
    int N;
    std::cin >> N;
    vector<int> A(N);
    for (auto& x : A) {
        std::cin >> x;
    }
    Sequence seq(A);
    Intervals range(N);
    SegmentTree seg(N);
    const auto insert = [&](int l, int r) {
        if (l + 1 < r) {
            seg.operate(l + 1, r, 1);
            range.add(l, r);
        }
    };
    const auto erase = [&](const int l, const int r) {
        seg.operate(l + 1, r - 1, -1);
    };
    {
        vector<ll> accum(N + 1);
        for (int i = 0; i < N; ++i) {
            accum[i + 1] = accum[i] + A[i];
        }
        vector<int> stack;
        const auto test = [&](const int l, const int r) {
            if (std::min(A[l], A[r]) > accum[r] - accum[l + 1]) {
                insert(l, r);
            }
        };
        for (int i = 0; i < N; ++i) {
            while (!stack.empty() and A[stack.back()] < A[i]) {
                test(stack.back(), i);
                stack.pop_back();
            }
            if (!stack.empty()) {
                test(stack.back(), i);
            }
            stack.push_back(i);
        }
    }
    int Q;
    std::cin >> Q;
    while (Q--) {
        int t;
        std::cin >> t;
        if (t == 1) {
            int i, x;
            std::cin >> i >> x;
            i -= 1;
            A[i] = x;
            seq.update(i, x);
            range.pop(i, erase);
            vector<pair<int, int>> left, right;
            {
                int k = i;
                ll sum = 0;
                while (true) {
                    sum += A[k];   
                    k = seq.upb_to_right(k + 1, sum);
                    if (k == -1) {
                        break;
                    }
                    right.emplace_back(k, seq.sum(i + 1, k));
                } 
            }
            {
                int k = i;
                ll sum = 0;
                while (true) {
                    sum += A[k];   
                    k = seq.upb_to_left(k, sum);
                    if (k == -1) {
                        break;
                    }
                    left.emplace_back(k, seq.sum(k + 1, i));
                } 
            }
            for (const auto& [l, sl] : left) {
                if (std::min(A[i], A[l]) > sl) {
                    insert(l, i);
                }
            }
            for (const auto& [r, sr] : right) {
                if (std::min(A[i], A[r]) > sr) {
                    insert(i, r);
                }
            }
            for (const auto& [l, sl] : left) {
                for (const auto& [r, sr] : right) {
                    if (std::min(A[l], A[r]) > sl + A[i] + sr) {
                        insert(l, r);
                    }
                }
            }
        } else {
            int l, r;
            std::cin >> l >> r;
            l -= 1;
            {
                ll sum = 0;
                const int lc = l;
                int cand = l;
                while (true) {
                    sum += A[l];
                    const int k = seq.upb_to_right(l + 1, sum);
                    if (k == -1 or k >= r) {
                        break;
                    }
                    if (seq.sum(lc, k) < A[k]) {
                        cand = k;
                    }
                    l = k;
                }
                l = cand;
            }
            {
                ll sum = 0;
                const int rc = r;
                int cand = r;
                while (true) {
                    sum += A[r - 1];
                    const int k = seq.upb_to_left(r - 1, sum);
                    if (k == -1 or k < l) {
                        break;
                    }
                    if (seq.sum(k + 1, rc) < A[k]) {
                        cand = k + 1;
                    }
                    r = k + 1;
                }
                r = cand;
            }
            // std::cerr << l << ' ' << r << std::endl;
            std::cout << seg.fold(l, r) << '\n';
        }
    }
    return 0;
}

Subtask #1
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 304 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Incorrect 1 ms 212 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #2
8.0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 66 ms 15744 KB Output is correct
3 Correct 51 ms 15608 KB Output is correct
4 Correct 48 ms 15692 KB Output is correct
5 Correct 43 ms 15660 KB Output is correct
6 Correct 53 ms 16412 KB Output is correct
7 Correct 26 ms 15204 KB Output is correct
8 Correct 55 ms 16364 KB Output is correct
9 Correct 27 ms 15180 KB Output is correct
10 Correct 42 ms 16124 KB Output is correct
11 Correct 33 ms 15696 KB Output is correct
12 Correct 33 ms 15608 KB Output is correct
13 Correct 29 ms 15624 KB Output is correct
14 Correct 45 ms 16492 KB Output is correct
15 Correct 49 ms 16420 KB Output is correct

Subtask #3
0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 304 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Incorrect 1 ms 212 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #4
23.0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 66 ms 15744 KB Output is correct
3 Correct 51 ms 15608 KB Output is correct
4 Correct 48 ms 15692 KB Output is correct
5 Correct 43 ms 15660 KB Output is correct
6 Correct 53 ms 16412 KB Output is correct
7 Correct 26 ms 15204 KB Output is correct
8 Correct 55 ms 16364 KB Output is correct
9 Correct 27 ms 15180 KB Output is correct
10 Correct 42 ms 16124 KB Output is correct
11 Correct 33 ms 15696 KB Output is correct
12 Correct 33 ms 15608 KB Output is correct
13 Correct 29 ms 15624 KB Output is correct
14 Correct 45 ms 16492 KB Output is correct
15 Correct 49 ms 16420 KB Output is correct
16 Correct 1 ms 296 KB Output is correct
17 Correct 455 ms 16612 KB Output is correct
18 Correct 378 ms 16772 KB Output is correct
19 Correct 434 ms 16584 KB Output is correct
20 Correct 482 ms 16508 KB Output is correct
21 Correct 452 ms 16600 KB Output is correct
22 Correct 332 ms 16784 KB Output is correct
23 Correct 429 ms 16508 KB Output is correct
24 Correct 492 ms 16644 KB Output is correct
25 Correct 464 ms 16612 KB Output is correct
26 Correct 481 ms 16540 KB Output is correct
27 Correct 350 ms 17600 KB Output is correct
28 Correct 320 ms 17540 KB Output is correct
29 Correct 328 ms 17496 KB Output is correct
30 Correct 561 ms 15976 KB Output is correct
31 Correct 529 ms 16096 KB Output is correct
32 Correct 560 ms 16600 KB Output is correct
33 Correct 369 ms 17024 KB Output is correct
34 Correct 531 ms 16440 KB Output is correct
35 Correct 428 ms 16156 KB Output is correct
36 Correct 383 ms 17436 KB Output is correct
37 Correct 355 ms 16360 KB Output is correct
38 Correct 353 ms 16472 KB Output is correct
39 Correct 330 ms 17692 KB Output is correct
40 Correct 302 ms 17428 KB Output is correct

Subtask #5
0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 66 ms 15744 KB Output is correct
3 Correct 51 ms 15608 KB Output is correct
4 Correct 48 ms 15692 KB Output is correct
5 Correct 43 ms 15660 KB Output is correct
6 Correct 53 ms 16412 KB Output is correct
7 Correct 26 ms 15204 KB Output is correct
8 Correct 55 ms 16364 KB Output is correct
9 Correct 27 ms 15180 KB Output is correct
10 Correct 42 ms 16124 KB Output is correct
11 Correct 33 ms 15696 KB Output is correct
12 Correct 33 ms 15608 KB Output is correct
13 Correct 29 ms 15624 KB Output is correct
14 Correct 45 ms 16492 KB Output is correct
15 Correct 49 ms 16420 KB Output is correct
16 Incorrect 0 ms 212 KB Output isn't correct
17 Halted 0 ms 0 KB -

Subtask #6
0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 304 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Incorrect 1 ms 212 KB Output isn't correct
5 Halted 0 ms 0 KB -