Submission #1078306

#	Time	Username	Problem	Language	Result	Execution time	Memory
1078306		belgianbot	Mechanical Doll (IOI18_doll)	C++17	62 / 100	89 ms	17696 KiB

doll

#include "doll.h"
#include <bits/stdc++.h>
#define pb push_back
#define fi first 
#define se second

using namespace std;

vector<vector<int>> adj;
vector<int> C, X, Y;

int cnt = -1;

void divide(vector<int> *a, int prev) {
    if (a->size() == 2) {
        X.pb((*a)[0]);
        Y.pb((*a)[1]);
        return;
    }

    vector<int> b, c;
    for (int i = 0; i < a->size(); i++) {
        if (i & 1) c.pb( (*a)[i]);
        else b.pb((*a)[i]);
    }
    if (b.size() > c.size()) {
        c.pb(b.back());
        b.back() = prev;
    }
    X.pb(cnt); cnt--; Y.pb(0); int n = Y.size();
    divide(&b, cnt + 1);
    Y[n - 1] = cnt; cnt--;
    divide(&c, cnt + 1);
}
void build(int x) {
    int n = adj[x].size();
    if (!n) adj[x].pb(x);
    if (n == 1) C[x] = adj[x][0];
    else if (n) {
        C[x] = cnt; cnt--;
        divide(&adj[x], cnt + 1);
    }

} 
void create_circuit(int M, vector<int> A) {
    if (M == 1) {
            int N = A.size();
    A.push_back(0);
    vector<int> C(M + 1, INT_MAX), X, Y;
    C[0] = A[0];
 
    int time = N - 1;
    vector<pair<int,int>> fact = {{1, 1}};
    int cnt = -1;
    while (time) {
        int next = 0;
        for (auto x : fact) {
            if (time % x.first == 0) {
                time -= x.first;
                next = x.first;
                X.push_back(x.second);
                if (cnt != -1) Y.push_back(cnt);
                else C[1] = cnt;
                cnt--;
                break;
            }
        }
        for (auto &x : fact) x.first += next;
        fact.push_back({next, cnt + 1});
    }
    if (cnt != -1) Y.push_back(0);
    else C[1] = 0;
    answer(C, X, Y);
    return;
    }
    int N = A.size();
    A.push_back(0);
    C.resize(M + 1);

    adj.resize(M + 1);
    adj[0].pb(A[0]); C[0] = A[0];
    for (int i = 1; i <= N; i++) adj[A[i-1]].pb(A[i]);

    for (int i = 1; i <= M; i++) build(i);

    answer(C, X, Y);
}

Compilation message (stderr)

doll.cpp: In function 'void divide(std::vector<int>*, int)':
doll.cpp:22:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |     for (int i = 0; i < a->size(); i++) {
      |                     ~~^~~~~~~~~~~

• Subtask 1: 2 / 2
• Subtask 2: 4 / 4
• Subtask 3: 10 / 10
• Subtask 4: 0 / 10
• Subtask 5: 18 / 18
• Subtask 6: 28.000000044799997 / 56