Submission #421623

#	Time	Username	Problem	Language	Result	Execution time	Memory
421623		Peti	Mechanical Doll (IOI18_doll)	C++14	0 / 100	1 ms	204 KiB

doll

#include <bits/stdc++.h>
#include "doll.h"

using namespace std;

std::vector<int> X, Y;

int add_switch(){
    X.push_back(0);
    Y.push_back(0);
    return (int)X.size()-1;
}

void set_child(int x, int l, int r){
    X[x] = l;
    Y[x] = r;
}

int get_reverse(int x, int log){
    int ret = 0;
    for(int i = log; i >= 0; i--)
        if(x&(1<<i))
            ret += (1<<(log-i));
    return ret;
}

int build(vector<int> &v, int l, int r){
    //cout<<l<<" "<<r<<"\n";
    if(l+1 == r)
        return v[l];
    int m = (l+r)/2, x = add_switch();
    set_child(x, build(v, l, m), build(v, m, r));
    return -x-1;
}

int add(int x, vector<int> v){
    int n = (int)v.size();
    while(n != (n&(-n))) n += (n&(-n));
    //cout<<n<<" asd"<<endl;

    reverse(v.begin(), v.end());
    v.resize(n, -(int)X.size()-1);
    reverse(v.begin(), v.end());

    vector<int> v2(n);
    int log = 31 - __builtin_clz(n);
    for(int i = 0; i < n; i++){
        v2[get_reverse(i, log-1)] = v[i];
    }

    /*for(int x : v2)
        cout<<x<<" ";
    cout<<"\n";*/

    return build(v2, 0, n);
}

void create_circuit(int M, std::vector<int> A) {
    int N = A.size();

    std::vector<int> C(M + 1, 0);
    C[0] = add(0, A);

    answer(C, X, Y);
}

Compilation message (stderr)

doll.cpp: In function 'void create_circuit(int, std::vector<int>)':
doll.cpp:59:9: warning: unused variable 'N' [-Wunused-variable]
   59 |     int N = A.size();
      |         ^

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