Submission #249713

#	Time	Username	Problem	Language	Result	Execution time	Memory
249713		stoyan_malinin	Mechanical Doll (IOI18_doll)	C++14	0 / 100	56 ms	71724 KiB

doll

#include "doll.h"
//#include "grader.cpp"

#include <iostream>

using namespace std;

const int MAXN = 5e5 + 5;

int usedSwitches = 0;

struct Switch
{
    static int switchCnt;

    int num;
    int state;

    int out[2];

    Switch()
    {
        this->num = switchCnt;
        switchCnt++;

        this->state = 0;
        this->out[0] = this->out[1] = MAXN;
    }
};
int Switch::switchCnt = 0;

Switch s[MAXN];

struct RouterOutput
{
    int switchNum, outNum;

    RouterOutput(){}
    RouterOutput(int switchNum, int outNum)
    {
        this->outNum = outNum;
        this->switchNum = switchNum;
    }

    void assignDirection(int nxt)
    {
        s[switchNum].out[outNum] = nxt;
    }
};

struct Router
{
    int root, sz;
    vector <RouterOutput> outs;

    Router(){}
    Router(int sz)
    {
        usedSwitches++;
        this->root = usedSwitches;

        this->sz = sz;
        build(root, 0, sz-1);

        //initOuts();
    }

    void build(int sInd, int l, int r)
    {
        //cout << sInd << " || " << l << " " << r << '\n';

        if(l+1==r) return;
        if(l+2==r)
        {
            usedSwitches++;
            s[sInd].out[0] = -usedSwitches;

            return;
        }

        usedSwitches++;
        s[sInd].out[0] = -usedSwitches;

        usedSwitches++;
        s[sInd].out[1] = -usedSwitches;

        build(s[sInd].out[0], l, (l+r)/2);
        build(s[sInd].out[0], (l+r)/2+1, r);
    }

    void initOuts()
    {
        for(int i = 0;i<sz;i++)
        {
            int sInd = root;
            while(true)
            {
                if(s[sInd].out[ s[sInd].state ]==MAXN)
                {
                    outs.push_back(RouterOutput(sInd, s[sInd].state));
                    s[sInd].state ^= 1;

                    break;
                }

                s[sInd].state ^= 1;
                sInd = -s[sInd].out[ s[sInd].state^1 ];
            }
        }

        if(outs.size()!=sz) answer({}, {}, {});
        //for(RouterOutput x: outs) cout << x.switchNum << " " << x.outNum << '\n';
    }
};

Router r[MAXN];
vector <int> nxt[MAXN];

void create_circuit(int M, vector <int> A)
{
    vector <int> C(M+1);

    A.push_back(0);
    for(int i = 0;i<A.size()-1;i++) nxt[ A[i] ].push_back(A[i+1]);

    C[0] = A[0];
    for(int i = 1;i<=M;i++)
    {
        if(nxt[i].size()>1)
        {
            int sz = 1;
            while(sz<nxt[i].size()) sz *= 2;

            r[i] = Router(sz);
            C[i] = -r[i].root;
        }
        else
        {
            if(nxt[i].size()==1) C[i] = nxt[i][0];
            else C[i] = 0;
        }
    }

    answer({}, {}, {});

    for(int x = 1;x<=M;x++)
    {
        if(nxt[x].size()<=1) continue;

        int useLess = r[x].sz - nxt[x].size();
        for(int i = 0;i<useLess;i++) r[x].outs[i].assignDirection(-r[x].root);

        for(int i = 0;i<nxt[x].size();i++)
        {
            r[x].outs[useLess+i].assignDirection(nxt[x][i]);
        }
    }

    //cout << '\n';

    //for(int i = 0;i<=M;i++) cout << C[i] << '\n';

    vector <int> X(usedSwitches), Y(usedSwitches);
    for(int i = 1;i<=usedSwitches;i++)
    {
        X[i-1] = s[i].out[0];
        Y[i-1] = s[i].out[1];

        //cout << X[i-1] << " " << Y[i-1] << '\n';
    }

    answer(C, X, Y);
}
/*
4 4
1 2 1 3

4 7
1 3 4 2 1 2 2

5 11
1 2 5 2 3 4 1 2 5 5 4

5 4
1 1 1 1
*/

Compilation message (stderr)

doll.cpp: In member function 'void Router::initOuts()':
doll.cpp:111:23: warning: comparison of integer expressions of different signedness: 'std::vector<RouterOutput>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  111 |         if(outs.size()!=sz) answer({}, {}, {});
      |            ~~~~~~~~~~~^~~~
doll.cpp: In function 'void create_circuit(int, std::vector<int>)':
doll.cpp:124:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  124 |     for(int i = 0;i<A.size()-1;i++) nxt[ A[i] ].push_back(A[i+1]);
      |                   ~^~~~~~~~~~~
doll.cpp:132:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  132 |             while(sz<nxt[i].size()) sz *= 2;
      |                   ~~^~~~~~~~~~~~~~
doll.cpp:153:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  153 |         for(int i = 0;i<nxt[x].size();i++)
      |                       ~^~~~~~~~~~~~~~

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