Submission #782334

#	Time	Username	Problem	Language	Result	Execution time	Memory
782334		faruk	Mechanical Doll (IOI18_doll)	C++17	53 / 100	87 ms	15744 KiB

doll

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

using namespace std;

vector<int> X, Y, C;
struct trigger {
    int id;
    int type;

    trigger() {}
    trigger(int typ)  {
        if (typ != 0) {
            id = typ;
            type = 1;
        } else {
            id = X.size();
            X.push_back(0);
            Y.push_back(0);
            type = 0;
        }
    }

    void connect_parent(int par) {
        C[par] = -id;
    }

    void connect_X(trigger x) {
        if (x.type == 0)
            X[id - 1] = -x.id;
        else
            X[id - 1] = x.id;
    }

    void connect_Y(trigger y) {
        if (y.type == 0) 
            Y[id - 1] = -y.id;
        else
            Y[id - 1] = y.id;
    }
};

void set_idxs(int curr, int idx, int depth, int max_node, trigger node, vector<trigger> &targets) {
    if (curr * 2 >= max_node) {
        int xi = idx, yi = idx + (1 << depth);
        node.connect_X(trigger(targets[xi]));
        node.connect_Y(trigger(targets[yi]));
        return;
    }
    
    trigger xnode(0);
    trigger ynode(0);
    set_idxs(curr*2, idx, depth + 1, max_node, xnode, targets);
    set_idxs(curr*2+1, idx + (1 << depth), depth + 1, max_node, ynode, targets);
    node.connect_X(xnode);
    node.connect_Y(ynode);
}

void create_device(int node, vector<trigger> targets) {
    int siz = 2, needed = 2;
    while (siz < targets.size())
        siz *= 2, needed += siz;
    trigger root(0); root.connect_parent(node);
    while (targets.size() < siz)
    {
        targets.push_back(root);
        swap(targets[targets.size() - 1], targets[targets.size() - 2]);
    }
    set_idxs(1, 0, 0, siz, root, targets);
}

void create_circuit(int M, std::vector<int> A) {
    int N = A.size();
    C.resize(M+1);
    C[0] = A[0];
    vector<vector<trigger> > targets(M+1);
    for (int i = 0; i < N; i++) {
        int next = i == N - 1 ? 0 : A[i + 1];
        targets[A[i]].push_back(trigger(next));
    }
    for (int i = 1; i <= M; i++) 
    {
        if (!targets[i].empty())
            create_device(i, targets[i]);
    }
    X.pop_back();
    Y.pop_back();

    answer(C, X, Y);
}

Compilation message (stderr)

doll.cpp: In function 'void create_device(int, std::vector<trigger>)':
doll.cpp:61:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<trigger>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   61 |     while (siz < targets.size())
      |            ~~~~^~~~~~~~~~~~~~~~
doll.cpp:64:27: warning: comparison of integer expressions of different signedness: 'std::vector<trigger>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   64 |     while (targets.size() < siz)
      |            ~~~~~~~~~~~~~~~^~~~~

• Subtask 1: 2 / 2
• Subtask 2: 4 / 4
• Subtask 3: 10 / 10
• Subtask 4: 0 / 10
• Subtask 5: 9.0000000036 / 18
• Subtask 6: 28.0000000112 / 56