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#include <cstdlib>
#include <iostream>
//#include <cassert>

#include "krazki.h"
#include "message.h"

#define MIN(a,b) (((a) > (b)) ? (b) : (a))

int nodes;
int pipe_start;
int pipe_end;
int n_disc;
int n_pipes;
int n_pipes_per_node;
int n_disc_per_node;
int id;

typedef struct {
        int pipe_nr;
        int disc_nr;
} t_pipe;

t_pipe *pipe;

int lowest_disc_nr;
int val;
int top_disc;
int val_from_lower_node;
int disc_nr_from_lower_node;


int move_disc(int st, int end)
{
        int i, j, lastpos;
        long long pipe_diam;
        long long disc_diam;

        lastpos = n_pipes_per_node;
        lowest_disc_nr = 0;
        top_disc = 0;
        for(i = st; i <= end; ++i) {
                j = 0;
                disc_diam = DiscDiameter( i );
                while(1) {
                        pipe_diam = HoleDiameter( pipe[j].pipe_nr );
                        if (pipe[j].disc_nr != 0 || disc_diam > pipe_diam) {
                                break;
                        }
                        j++;
                        if (j == n_pipes_per_node) {
                                break;
                        }
                }
                if (j < n_pipes_per_node) {
                        if (j > 0) {
                                j--;
                                pipe[j].disc_nr = i;
                                lastpos = j;
                                top_disc = i;
                                if (lowest_disc_nr == 0) {
                                        lowest_disc_nr = i;
                                }
                        } else {
                                if (j == 0) {
                                        return end - i + 1;
                                }
                        }
                }
        }
        return -lastpos;
}

int move_disc_last(int st, int end)
{
        int i, j, lastpos;
        long long pipe_diam;
        long long disc_diam;

        lastpos = n_pipes_per_node;
        top_disc = 0;
        for(i = st; i <= end; ++i) {
                j = 0;
                disc_diam = DiscDiameter( i );
                while(1) {
                        pipe_diam = HoleDiameter( pipe[j].pipe_nr );
                        if (pipe[j].disc_nr != 0 || disc_diam > pipe_diam) {
                                break;
                        }
                        j++;
                        if (j == n_pipes_per_node) {
                                break;
                        }
                }
                if (j <= n_pipes_per_node) {
                        if (j > 0) {
                                j--;
                                pipe[j].disc_nr = i;
                                lastpos = j;
                                top_disc = i;
                        } else {
                                //assert (j == 0);
                                return end - i + 1;
                        }
                }
        }
        return -lastpos;
}

int main() {

        int last_disc = 0;

        nodes = NumberOfNodes();
        n_disc = NumberOfDiscs();
        n_pipes = PipeHeight();
        id = MyNodeId();

        if (n_disc > n_pipes) {
                if (id != 0) {
                        return 0;
                }
                std::cout << "0\n";
                return 0;
        }

        pipe = NULL;

        while (1) {
                n_pipes_per_node = n_pipes / nodes;
                if (n_disc - last_disc > n_pipes) {
                        if (id != 0) {
                                return 0;
                        } else {
                                std::cout << "0\n";
                                return 0;
                        }
                }

                if (n_pipes_per_node <= 2) {
                        if (id != 0) {
                                return 0;
                        }
                        pipe_start = 1;
                        pipe_end = n_pipes;
                        n_pipes_per_node = n_pipes;
                        pipe = new t_pipe [ n_pipes ];
                        for(int i = 0; i < n_pipes_per_node; ++i) {
                                pipe[i].pipe_nr = pipe_start+i;
                                pipe[i].disc_nr = 0;
                        }       

                        n_disc_per_node = n_disc - last_disc;

                        val = move_disc_last(last_disc + 1, n_disc );
                        if (val >= 0) {
                                std::cout << "0\n";
                                return 0;
                        } else {
                                std::cout << -val+1 << "\n";
                                return 0;
                        }
                }

                pipe_start = id * n_pipes_per_node+1;
                pipe_end   = (id+1) * n_pipes_per_node;
                if (id == nodes-1) {
                        pipe_end = n_pipes;
                        n_pipes_per_node = pipe_end - pipe_start + 1;
                }

                //std::cerr << "node:" << id << " pstart " << pipe_start << " pend " << pipe_end << "\n";
                
                if (pipe == NULL) {
                        pipe = new t_pipe [ n_pipes_per_node ];
                }

                for(int i = 0; i < n_pipes_per_node; ++i) {
                        pipe[i].pipe_nr = pipe_start+i;
                        pipe[i].disc_nr = 0;
                }
                
                //for(int i = 0; i < n_pipes_per_node; ++i) {
                //        std::cerr << "node: " << id << " pipe pos " << i << " nr " << pipe[i].pipe_nr << "\n";
                //}


                n_disc_per_node = MIN(n_pipes / nodes, n_disc - last_disc);

                if (id < nodes-1) {
                        val = move_disc(last_disc + 1, last_disc + n_disc_per_node );
                } else {
                        val = move_disc_last(last_disc + 1, last_disc + n_disc_per_node );
                }
                last_disc += n_disc_per_node;
                //std::cerr << "node: " << id << " val "  << val << "\n";

                /*for(int i = 0; i < n_pipes_per_node; ++i) {
                        std::cerr << "node: " << id 
                                << " pipe_nr: " << pipe[i].pipe_nr 
                                << " pipe_diam: " << HoleDiameter( pipe[i].pipe_nr )
                                << " disc_nr: " << pipe[i].disc_nr
                                << " disc_diam " << (pipe[i].disc_nr == 0 ? 0 : DiscDiameter( pipe[i].disc_nr ))
                                << " lowest disc " << lowest_disc_nr
                                << " top disc " << top_disc << "\n";

                }*/

                if (id < nodes-1) {
                        Receive(id+1);
                        val_from_lower_node = GetInt(id+1);
                      //  std::cerr << "node: " << id
                      //          << " received val " << val_from_lower_node
                       //         << "\n";
                        if (val_from_lower_node > 0) {
                                Receive(id+1);
                                disc_nr_from_lower_node = GetInt(id+1);
                         //       std::cerr << "node: " << id
                           //             << " received disc_nr " << disc_nr_from_lower_node
                             //           << "\n";
                        }

                        if (val <= 0) {
                                if (val_from_lower_node <= 1) {
                                        if (val == -n_pipes_per_node) {
                                                val += val_from_lower_node;
                                        }
                                } else {
                                        if (disc_nr_from_lower_node + val_from_lower_node - 1 >= lowest_disc_nr) {
                                                val_from_lower_node = lowest_disc_nr - disc_nr_from_lower_node;
                                        }

                                        if (val_from_lower_node > 1) {
                                                if (val < 0) {
                                                        if (-val > n_pipes_per_node - (n_disc_per_node - disc_nr_from_lower_node + 1)) {
                                                                val = -n_pipes_per_node + n_disc_per_node - disc_nr_from_lower_node + 1;
                                                        }
                                                        //if (1-val > val_from_lower_node) {
                                                        //        val = 1 - val_from_lower_node;
                                                        //}
                                                }       
                                        }
                                }
                        }
                }

                if (id > 0) {
                        PutInt(id-1, val);
                        Send(id-1);
                        if (val > 0) {
                                PutInt(id-1, top_disc+1);
                                Send(id-1);
                        }
                } //else {
                  //      std::cerr << "node: 0 val " << val << "\n";
                //}

                if (last_disc >= n_disc) {
                        if (id == 0) {
                                if (val > 0) {
                                        std::cout << "0\n";
                                } else {
                                        std::cout << -val+1 << "\n";
                                }
                        }
                        return 0;
                }

                if (id == 0) {
                        if (val >= 0) {
                                std::cout << "0\n";
                                for(int i = 1; i < nodes; ++i) {
                                        PutInt(i, 0);
                                        Send(i);
                                }
                                return 0;
                        } else {
                                val = -val;
                                for(int i = 1; i < nodes; ++i) {
                                        PutInt(i, val);
                                        Send(i);
                                }
                        }
                } else {
                        Receive(0);
                        val = GetInt(0);
                        if (val == 0) {
                                return 0;
                        }
                }

                n_pipes = val;
        }

        return 0;
}