#include<iostream>
#include<cstdlib>
using namespace std;

void spos_rand(int*& p,int* mat,int m,int n){
  int pi=(p-mat)/n; // (pi,pj) sono le coordinate 
  int pj=(p-mat)%n; // dell'elemento a cui punta p
  cout << "p=(" << pi << "," << pj << ") ";
  int i=(int) ((float)m*rand()/(RAND_MAX+1.0));
  int j=(int) ((float)n*rand()/(RAND_MAX+1.0));
  cout << "spost=(" << i << "," << j << ") --->>> ";
  pi=(pi+i)%m;
  pj=(pj+j)%n;
  cout << "p=(" << pi << "," << pj << ")" << endl;;
  p=mat+pi*n+pj;
  (*p)++;
}


int main(){
  int mat[10][8];
  int *p=&mat[0][0];
  for(int i=0;i<10;i++)
    for(int j=0;j<8;j++)
      mat[i][j]=0;
  srand(27546);
  for(int i=0;i<10;i++)
    spos_rand(p,&mat[0][0],10,8);
  for(int i=0;i<10;i++){
    for(int j=0;j<8;j++)
      cout << mat[i][j] << " ";
    cout << endl;
  }
  return(0);
}