Submission #137666

#	Time	Username	Problem	Language	Result	Execution time	Memory
137666		bensonlzl	Mechanical Doll (IOI18_doll)	C++14	84 / 100	250 ms	54340 KiB

doll

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

using namespace std;

typedef pair<int,int> pi;

int mlevel;

int cnt = 1;
int pow2[25];
int bigN;
int sequence[200005];

vector<int> X, Y;

struct switcher{
    switcher *left = nullptr, *right = nullptr;
    int level, id, lnode, rnode, state = 0;
    switcher(int n, int lv, int offset){
        id = cnt;
        cnt++;
        if (lv == 0){
            if (n == 2){
                lnode = 1;
                rnode = 1;
            }
            else{
                lnode = 1;
                rnode = -1;
            }
        }
        else{
            if (n > pow2[lv]){
                left = new switcher(n-pow2[lv],lv-1,offset);
                right = new switcher(pow2[lv],lv-1,offset+n-pow2[lv]);
                lnode = -left->id;
                rnode = -right->id;
            }
            else{
                right = new switcher(n,lv-1,offset);
                lnode = -1;
                rnode = -right->id;
            }
            
        } 
    }
    void revisit(switcher *r){
        if (lnode == -1){
            left = r;
        }
        if (rnode == -1){
            right = r;
        }

        if (left != nullptr && left != r){
            left->revisit(r);
        }
        if (right != r && right != nullptr){
            right->revisit(r);
        }
    }
}*root;

void dfs(switcher *cur, int nx){
    if (nx > bigN) return;
    if (cur->state == 0){
        cur->state = 1;
        if (cur->left == nullptr){
            cur->lnode = sequence[nx];
            X[cur->id-1] = sequence[nx];
            dfs(root,nx+1);
        }
        else{
            X[cur->id-1] = -cur->left->id;
            dfs(cur->left,nx);
        }
    }
    else{
        cur->state = 0;
        if (cur->right == nullptr){
            cur->lnode = sequence[nx];
            Y[cur->id-1] = sequence[nx];
            dfs(root,nx+1);
        }
        else{
            Y[cur->id-1] = -cur->right->id;
            dfs(cur->right,nx);
        }
    }
}

void create_circuit(int M, vector<int> A) {
    pow2[0] = 1;
    for (int i = 1; i < 25; ++i){
        pow2[i] = pow2[i-1]*2;
    }
    int N = A.size();
    bigN = N;
    vector<int> C;
    C.resize(M+1);
    C[0] = A[0];
    for (int i = 1; i <= M; ++i){
        C[i] = -1;
    }
    for (int i = 0; i < A.size(); ++i){
        if (i == A.size()-1){
            sequence[i+1] = 0;
        }
        else sequence[i+1] = A[i+1];
    }
    //cout << "YEET\n" << flush;
    int x = 1, p = 0;
    while (x < N){
        p++;
        x *= 2;
    }
    root = new switcher(N,p-1,1);
    //cout << "YEET\n" << flush;
    X.resize(cnt);
    Y.resize(cnt);
    //cout << "YEET\n" << flush;
    root->revisit(root);
    //cout << "YEET\n" << flush;
    switcher *a = root;
    //cout << "YEET\n" << flush;
    dfs(a,1);
    //cout << "YEET\n" << flush;
    answer(C, X, Y);
}

Compilation message (stderr)

doll.cpp: In function 'void create_circuit(int, std::vector<int>)':
doll.cpp:106:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  106 |     for (int i = 0; i < A.size(); ++i){
      |                     ~~^~~~~~~~~~
doll.cpp:107:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  107 |         if (i == A.size()-1){
      |             ~~^~~~~~~~~~~~~

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