Submission #627713

#	Time	Username	Problem	Language	Result	Execution time	Memory
627713		dqhungdl	Digital Circuit (IOI22_circuit)	C++17	4 / 100	1030 ms	29592 KiB

circuit

#include "circuit.h"
#include <bits/stdc++.h>
using namespace std;

typedef pair<int, int> ii;
const int MAX = 2e5 + 5, MOD = 1e9 + 2022;
int N;
long long C[MAX], f[MAX];
vector<long long> g[MAX];

struct SegmentTree {
    int n;
    vector<vector<long long>> tree;
    vector<int> lazy;

    SegmentTree() {}

    SegmentTree(int _n, vector<vector<long long>> &V) {
        n = _n;
        tree.resize(4 * n + 5, {0, 0});
        lazy.resize(4 * n + 5);
        init(1, 0, n - 1, V);
    }

    void init(int k, int l, int r, vector<vector<long long>> &V) {
        if (l == r) {
            tree[k] = V[l];
            return;
        }
        int mid = (l + r) / 2;
        init(2 * k, l, mid, V);
        init(2 * k + 1, mid + 1, r, V);
        for (int i = 0; i <= 1; i++)
            tree[k][i] = (tree[2 * k][i] + tree[2 * k + 1][i]) % MOD;
    }

    void down(int k) {
        if (lazy[k]) {
            lazy[2 * k] ^= lazy[k], lazy[2 * k + 1] ^= lazy[k];
            if (lazy[2 * k])
                swap(tree[2 * k][0], tree[2 * k][1]);
            if (lazy[2 * k + 1])
                swap(tree[2 * k + 1][0], tree[2 * k + 1][1]);
            lazy[k] = 0;
        }
    }

    void update(int k, int l, int r, int L, int R) {
        if (l > R || L > r)
            return;
        if (L <= l && r <= R) {
            swap(tree[k][0], tree[k][1]);
            lazy[k] ^= 1;
            return;
        }
        down(k);
        int mid = (l + r) / 2;
        update(2 * k, l, mid, L, R);
        update(2 * k + 1, mid + 1, r, L, R);
        for (int i = 0; i <= 1; i++)
            tree[k][i] = (tree[2 * k][i] + tree[2 * k + 1][i]) % MOD;
    }

    void update(int L, int R) {
        update(1, 0, n - 1, L, R);
    }
} tree;

void dfs(int u) {
    if (g[u].empty()) {
        C[u] = 1;
        return;
    }
    C[u] = g[u].size();
    for (int v: g[u]) {
        dfs(v);
        C[u] = C[u] * C[v] % MOD;
    }
    vector<long long> L(g[u].size()), R(g[u].size());
    L[0] = C[g[u][0]];
    for (int i = 1; i < g[u].size(); i++)
        L[i] = L[i - 1] * C[g[u][i]] % MOD;
    R.back() = C[g[u].back()];
    for (int i = (int) g[u].size() - 2; i >= 0; i--)
        R[i] = R[i + 1] * C[g[u][i]] % MOD;
    for (int i = 0; i < g[u].size(); i++) {
        long long left = i ? L[i - 1] : 1;
        long long right = i < g[u].size() - 1 ? R[i + 1] : 1;
        f[g[u][i]] = left * right % MOD;
    }
}

void init(int _N, int M, vector<int> P, vector<int> A) {
    N = _N;
    for (int i = 1; i < N + M; i++)
        g[P[i]].push_back(i);
    dfs(0);
    f[0] = 1;
    for (int i = 1; i < N + M; i++)
        f[i] = f[i] * f[P[i]] % MOD;
    vector<vector<long long>> V(M);
    for (int i = 0; i < M; i++)
        if (A[i])
            V[i] = {0, f[i + N]};
        else
            V[i] = {f[i + N], 0};
    tree = SegmentTree(M, V);
}

int count_ways(int L, int R) {
    tree.update(L - N, R - N);
    return tree.tree[1][1];
}

//int main() {
//    freopen("../_input", "r", stdin);
//    int N, M, Q;
//    assert(3 == scanf("%d %d %d", &N, &M, &Q));
//    std::vector<int> P(N + M), A(M);
//    for (int i = 0; i < N + M; ++i) {
//        assert(1 == scanf("%d", &P[i]));
//    }
//    for (int j = 0; j < M; ++j) {
//        assert(1 == scanf("%d", &A[j]));
//    }
//    init(N, M, P, A);
//
//    for (int i = 0; i < Q; ++i) {
//        int L, R;
//        assert(2 == scanf("%d %d", &L, &R));
//        printf("%d\n", count_ways(L, R));
//    }
//    return 0;
//}

Compilation message (stderr)

circuit.cpp: In function 'void dfs(int)':
circuit.cpp:81:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   81 |     for (int i = 1; i < g[u].size(); i++)
      |                     ~~^~~~~~~~~~~~~
circuit.cpp:86:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   86 |     for (int i = 0; i < g[u].size(); i++) {
      |                     ~~^~~~~~~~~~~~~
circuit.cpp:88:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   88 |         long long right = i < g[u].size() - 1 ? R[i + 1] : 1;
      |                           ~~^~~~~~~~~~~~~~~~~

• 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