Submission #774280

#	Time	Username	Problem	Language	Result	Execution time	Memory
774280		pashka	Mechanical Doll (IOI18_doll)	C++17	37 / 100	73 ms	9892 KiB

doll

#include "doll.h"

using namespace std;

int reverse(int x, int k) {
    int y = 0;
    for (int i = 0;i < k; i++) {
        y = (y * 2) + (x % 2);
        x /= 2;
    }
    return y;
}

void create_circuit(int M, std::vector<int> A) {
    int n = A.size();
    int k = 0;
    while ((1 << (k + 1)) < n + 1) {
        k++;
    }
    vector<int> x((1 << (k + 1)) - 1), y((1 << (k + 1)) - 1);
    for (int i = 0; i < (1 << k) - 1; i++) {
        x[i] = -((2 * i + 1) + 1);
        y[i] = -((2 * i + 2) + 1);
    }
    for (int i = 0; i < (1 << k); i++) {
        int t = reverse(2 * i, k + 1);
        if (t < n) {
            t = A[t];
        } else {
            t = -1;
        }
        x[(1 << k) - 1 + i] = t;
        t = reverse(2 * i + 1, k + 1);
        if (t < n) {
            t = A[t];
        } else if (i == (1 << k) - 1) {
            t = 0;
        } else {
            t = -1;
        }
        y[(1 << k) - 1 + i] = t;
    }
    vector<int> c(M + 1, -1);
//    for (int i = 0; i < x.size(); i++) {
//        cout << x[i] << " " << y[i] << "\n";
//    }
    answer(c, x, y);
}

• Subtask 1: 0 / 2
• Subtask 2: 0 / 4
• Subtask 3: 0 / 10
• Subtask 4: 0 / 10
• Subtask 5: 9 / 18
• Subtask 6: 28 / 56