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#include <iostream>
#include <map>
#include <math.h>

#include "message.h"
#include "kollib.h"


typedef std::map<int, int> Map;
typedef Map::const_iterator MapConstIter;


/************************
 *
 ************************/


struct Data
{
    Data()
        : nr_zapytania(0)
        , nr_node(0)
        , from(false)
        , pos(0)
    {}

    Data(int nr_zapytania, int nr_node, bool from, int pos)
        : nr_zapytania(nr_zapytania)
        , nr_node(nr_node)
        , from(from)
        , pos(pos)
    {}

    int nr_zapytania;
    int nr_node;
    bool from;
    int pos;
};


typedef std::map<int, std::pair<Data, Data> > ResponseMap;
typedef ResponseMap::iterator ResponseMapIter;
typedef ResponseMap::const_iterator ResponseMapConstIter;


/************************
 *
 ************************/


void get_next(int &index, int &last);
void inizialize(int numberOfNodes, int myNodeId, Map &uczniowie, int n);

void inizialize_zero(int numberOfNodes, int myNodeId, Map &uczniowie, int n);
void inizialize_under(int numberOfNodes, int myNodeId, Map &uczniowie, int n);
void inizialize_above(int numberOfNodes, int myNodeId, Map &uczniowie, int n);

int get_number(int numberOfNodes, int myNodeId, int numberOfStudents);

void processNodeZero(int numberOfNodes, int numberOfStudents, const Map &uczniowie, ResponseMap &responseMap);
void processOtherNodes(const Map &uczniowie);

void getDataFromNodes(const Map &uczniowie, ResponseMap &responseMap);
void updateResponseMap(ResponseMap &responseMap, const Data &data);
void processData(int numberOfNodes, int numberOfStudents, const ResponseMap &responseMap);
int count_diff(int numberOfStudents, int nZero, int n, const Data &d1, const Data &d2);


/************************
 * Main
 ************************/


int main()
{
    std::ios_base::sync_with_stdio(0);

    //
    int numberOfNodes = NumberOfNodes();
    int myNodeId = MyNodeId();

    int numberOfStudents = NumberOfStudents();

    // DEBUG
//    if (myNodeId == 0)
//    {
//        std::cout << "ns: " << numberOfStudents << std::endl;
//        std::cout << "nn: " << numberOfNodes << std::endl;
//    }

    //
    Map uczniowie;
    inizialize(numberOfNodes, myNodeId, uczniowie, get_number(numberOfNodes, myNodeId, numberOfStudents));

    // DEBUG
//    MapConstIter iter = uczniowie.begin(), end = uczniowie.end();

//    for ( ; iter != end; ++iter)
//    {
//        std::cout << "node: " << myNodeId << " " << iter->first << " " << iter->second << std::endl;
//    }

    // DEBUG
    //return 0;

    //
    ResponseMap responseMap;

    if (myNodeId != 0)
    {
        processOtherNodes(uczniowie);
    }
    else
    {
        processNodeZero(numberOfNodes, numberOfStudents, uczniowie, responseMap);
    }

    //
    return 0;
}


/**************************
 * Funkcje
 **************************/

/**
 *
 */
void get_next(int &index, int &last)
{
    int x = FirstNeighbor(index);
    int y = SecondNeighbor(index);

    if (x == last)
    {
        last = index;
        index = y;
    }
    else
    {
        last = index;
        index = x;
    }
}

/**
 *
 */
void inizialize(int numberOfNodes, int myNodeId, Map &uczniowie, int n)
{
    if (myNodeId == 0)
    {
        inizialize_zero(numberOfNodes, myNodeId, uczniowie, n);
    }
    else if(myNodeId < (numberOfNodes + 1) / 2)
    {
        inizialize_under(numberOfNodes, myNodeId, uczniowie, n);
    }
    else
    {
        inizialize_above(numberOfNodes, myNodeId, uczniowie, n);
    }
}

/**
 *
 */
void inizialize_zero(int numberOfNodes, int myNodeId, Map &uczniowie, int n)
{
    int last = FirstNeighbor(1), index = 1, counter = 0;

    //
    if (numberOfNodes > 1)
    {
        PutInt(numberOfNodes - 1, index);
        PutInt(numberOfNodes - 1, SecondNeighbor(1));
        Send(numberOfNodes - 1);
    }

    //
    uczniowie.insert(std::make_pair(1, 0));
    counter++;
    index = 1;

    //
    for ( ; counter < n; ++counter)
    {
        get_next(index, last);
        uczniowie.insert(std::make_pair(index, counter));
    }

    //
    if (numberOfNodes > 2)
    {
        PutInt(myNodeId + 1, index);
        PutInt(myNodeId + 1, last);
        Send(myNodeId + 1);
    }
}

/**
 *
 */
void inizialize_under(int numberOfNodes, int myNodeId, Map &uczniowie, int n)
{
    int counter = 0;

    int source = Receive(myNodeId - 1);
    int index = GetInt(source);
    int last = GetInt(source);

    //
    for ( ; counter < n; ++counter)
    {
        get_next(index, last);
        uczniowie.insert(std::make_pair(index, counter));
    }

    //
    if (myNodeId < ((numberOfNodes + 1) / 2) - 1)
    {
        PutInt(myNodeId + 1, index);
        PutInt(myNodeId + 1, last);
        Send(myNodeId + 1);
    }
}

/**
 *
 */
void inizialize_above(int numberOfNodes, int myNodeId, Map &uczniowie, int n)
{
    int counter = n - 1;

    //
    int nn = 0;
    if (myNodeId == numberOfNodes - 1)
    {
        nn = 0;
    }
    else
    {
        nn = myNodeId + 1;
    }

    int source = Receive(nn);
    int index = GetInt(source);
    int last = GetInt(source);

    //
    for ( ; counter >= 0; --counter)
    {
        get_next(index, last);
        uczniowie.insert(std::make_pair(index, counter));
    }

    //
    if (myNodeId > ((numberOfNodes + 1) / 2))
    {
        PutInt(myNodeId -1, index);
        PutInt(myNodeId -1, last);
        Send(myNodeId - 1);
    }
}

/**
 * Zwraca liczbę uczniów, które będą na tym nodzie.
 */
int get_number(int numberOfNodes, int myNodeId, int numberOfStudents)
{
    if (myNodeId == 0)
    {
        return (numberOfStudents / numberOfNodes) + (numberOfStudents % numberOfNodes);
    }

    return numberOfStudents / numberOfNodes;
}

/**
 *
 */
void processNodeZero(int numberOfNodes, int numberOfStudents, const Map &uczniowie, ResponseMap &responseMap)
{
    getDataFromNodes(uczniowie, responseMap);

    // DEBUG
//    std::cout << "response map------------" << std::endl;

//    ResponseMapConstIter iter = responseMap.begin(), end = responseMap.end();
//    for ( ; iter != end; ++iter)
//    {
//        std::cout << "from: " << iter->second.first.nr_zapytania << " " << iter->second.first.nr_node << " " << iter->second.first.pos << std::endl;
//        std::cout << "to: " << iter->second.second.nr_zapytania << " " << iter->second.second.nr_node << " " << iter->second.second.pos << std::endl;
//    }

//    std::cout << "response map------------" << std::endl;

    //
    processData(numberOfNodes, numberOfStudents, responseMap);
}

/**
 *
 */
void processOtherNodes(const Map &uczniowie)
{
    int n = NumberOfQueries();

    for (int i = 0; i < n; ++i)
    {
        int from = QueryFrom(i + 1);
        int to = QueryTo(i + 1);

        //
        {
            MapConstIter iter = uczniowie.find(from);

            if (iter != uczniowie.end())
            {
                PutInt(0, i);
                PutInt(0, 0);
                PutInt(0, iter->second);
                Send(0);
            }
        }

        //
        {
            MapConstIter iter = uczniowie.find(to);

            if (iter != uczniowie.end())
            {
                PutInt(0, i);
                PutInt(0, 1);
                PutInt(0, iter->second);
                Send(0);
            }
        }
    }
}

/**
 *
 */
void getDataFromNodes(const Map &uczniowie, ResponseMap &responseMap)
{
    int n = NumberOfQueries();

    for (int i = 0; i < n; ++i)
    {
        //
        {
            int from = QueryFrom(i + 1);
            MapConstIter iter = uczniowie.find(from);

            if (iter != uczniowie.end())
            {
                Data data;

                data.nr_zapytania = i;
                data.nr_node = 0;
                data.from = false;
                data.pos = iter->second;

                updateResponseMap(responseMap, data);
            }
            else
            {
                int source = Receive(-1);

                Data data;
                data.nr_node = source;
                data.nr_zapytania = GetInt(source);
                data.from = GetInt(source);
                data.pos = GetInt(source);

                updateResponseMap(responseMap, data);
            }
        }

        //
        {
            int to = QueryTo(i + 1);
            MapConstIter iter = uczniowie.find(to);

            if (iter != uczniowie.end())
            {
                Data data;

                data.nr_zapytania = i;
                data.nr_node = 0;
                data.from = true;
                data.pos = iter->second;

                updateResponseMap(responseMap, data);
            }
            else
            {
                int source = Receive(-1);

                Data data;
                data.nr_node = source;
                data.nr_zapytania = GetInt(source);
                data.from = GetInt(source);
                data.pos = GetInt(source);

                updateResponseMap(responseMap, data);
            }
        }
    }
}

/**
 *
 */
void updateResponseMap(ResponseMap &responseMap, const Data &data)
{
    ResponseMapIter iter = responseMap.find(data.nr_zapytania);

    if (iter == responseMap.end())
    {
        iter = responseMap.insert(std::make_pair(data.nr_zapytania, std::make_pair(Data(), Data()))).first;
    }

    //
    if (data.from == false)
    {
        iter->second.first = data;
    }
    else
    {
        iter->second.second = data;
    }
}

/**
 *
 */
void processData(int numberOfNodes, int numberOfStudents, const ResponseMap &responseMap)
{
    //
    int n = numberOfStudents / numberOfNodes;
    int nZero = n + (numberOfStudents % numberOfNodes);

    //
    ResponseMapConstIter iter = responseMap.begin(), end = responseMap.end();

    for ( ; iter != end; ++iter)
    {
        std::cout << count_diff(numberOfStudents, nZero, n, iter->second.first, iter->second.second) << std::endl;
    }
}

/**
 *
 */
int count_diff(int numberOfStudents, int nZero, int n, const Data &d1, const Data &d2)
{
    // DEBUG
    //std::cout << "count diff: " << numberOfStudents << " " << nZero << " " << n << std::endl;

    Data a1, a2;

    if (d1.nr_node < d2.nr_node)
    {
        a1 = d1;
        a2 = d2;
    }
    else
    {
        a1 = d2;
        a2 = d1;
    }

    //
    if (a1.nr_node == a2.nr_node)
    {
        int diff = abs(a1.pos - a2.pos);
        return std::min(diff, numberOfStudents - diff);
    }

    //
    int x = 0;
    if (a1.nr_node == 0)
    {
        x = nZero - a1.pos - 1;
    }
    else
    {
        x = n - a1.pos - 1;
    }

    //
    int y = a2.pos + 1;

    //
    int all = x + y + ((a2.nr_node - a1.nr_node - 1) * n);
    return std::min(all, numberOfStudents - all);
}