Submission #797686

#	Time	Username	Problem	Language	Result	Execution time	Memory
797686		jakobrs	Digital Circuit (IOI22_circuit)	C++17	4 / 100	711 ms	4672 KiB

circuit

#include <iostream>
#include <vector>

using i64 = int64_t;

const i64 MOD = 1'000'002'022;

struct Node {
    i64 a1, ax;

    Node() : a1(0), ax(1) {}
    explicit Node(bool value) : a1(value), ax(1) {}
    Node(i64 a1, i64 ax) : a1(a1), ax(ax) {}

    Node operator*(const Node &rhs) const {
        return {(a1 * rhs.ax + ax * rhs.a1) % MOD, ax * rhs.ax * 2 % MOD};
    }
};

struct SegmentTree {
    std::vector<Node> values;
    i64 offset;

    SegmentTree() : values{}, offset{0} {}
    explicit SegmentTree(size_t sz) : values(2 * sz), offset(sz) {}

    void update(i64 idx, bool value) {
        idx += offset;

        values[idx] = Node(value);

        while (idx /= 2) {
            values[idx] = values[2 * idx] * values[2 * idx + 1];
        }
    }

    const Node &root() const { return values[1]; }
};

int n, m;
std::vector<int> p, a;

SegmentTree st;

void init(int N, int M, std::vector<int> P, std::vector<int> A) {
    n = N;
    m = M;
    p = P;
    a = A;

    st = SegmentTree(N + 1);

    for (i64 i = 0; i < M; i++) {
        st.update(i, A[i]);
    }
}

int count_ways(int l, int r) {
    r += 1;

    l -= n;
    r -= n;

    st.update(l, a[l] = !a[l]);

    return st.root().a1;
}

Compilation message (stderr)

circuit.cpp: In function 'int count_ways(int, int)':
circuit.cpp:64:23: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   64 |     st.update(l, a[l] = !a[l]);

• Subtask 1: 0 / 2
• Subtask 2: 0 / 7
• Subtask 3: 0 / 9
• Subtask 4: 4 / 4
• Subtask 5: 0 / 12
• Subtask 6: 0 / 27
• Subtask 7: 0 / 28
• Subtask 8: 0 / 11