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#include<stdio.h>
#include<stdlib.h>
#include<termios.h>
#include<time.h>
#include<unistd.h>
#define f printf
#define n f("\r\n")
#define r(_,n)for(int _=0;_<n;++_)
#define t(_)(G+y*((x+S)%(S+1)+_*x)+(S+1-y)*i)
int S ,N,E,C ,*L ,*T ,F[128] ,*G =F;struct termios O ;void x() {tcsetattr(0,TCSAFLU\
SH,&O);f("\e[?25h\e" "[?1049l\e[2J\e[H");} void _(){ f("+");r( i,8*S-1)f("-");f("+")
;n;}void l(){f("|"); r(i,S){r(j,7)f(" ");f ("|" ); } n;}int m( int x,int y,int d){C=
0;r(i,S){E=0;L=0;r(j ,S)if(*(T=t(j)))if(L &&*T==*L) {if(d){*L *=2;T=0;}L=0;C=1;}else
{L=t(E);if (d)*L=*T; ++E;}for( ;E<S;++E) {T=t(E);C |=*T;if( d)*T=0;}}
return! C; }void p() {E=0;r(i, S *S)if(! G[i])++E; if(E==0) return;N=
rand()%E;r (i,S*S)if (!G[i]&& --E==N)G[ i]=rand() %8?2:4;} int main(
int A,char **a){srand (time(0)) ;S=A> 1?( *a[1]-48) :4;if(S< 2 ||S>8){
fputs("invalid board size" "\n" ,stderr); return 1;} atexit(x); f ("\033[?1049h");tc\
getattr(0,&O);struct termios o =O;o. c_iflag &=~ ( BRKINT| ICRNL| INPCK |ISTRIP|
IXON);o.c_oflag&=~ OPOST;o. c_cflag|= CS8;o.c_lflag&=~(ECHO |ICANON|IEXTEN|ISIG);
o.c_cc[VMIN]=0;o.c_cc [VTIME]=1 ;tcsetattr (0,2,&o);f("\e[?25l") ;p();p();while(32){f(
"\e[2J\e[H");_();r(i ,S){l();f ("| ");r( j,S){if(!*G)f(" " " | "); else if (*G>=
1024)f(" " "%2dk |" " ", * G/ 1024);else f("%4d " "| ",*G);
++G;}n;l() ;if(i<S-1 ){f("|"); r(j,S){r( j,7)f("-" );if(j<S-
1) f("+"); }f( "|"); n;}}_();G -= S*S;f( " h"",j" ",k,l: "
"move") ;r (i,9 )f( " " ); f( "q: quit" );fflush( stdout );
char k,e=0;while( read(0,&k, 1)!=1);if( k=='q') goto q;if(k=='h')m(1,
1,e=1);if(k=='j')m(- 1,S,e=1);if(k=='k')m( 1,S,e=1); if(k =='l')m(-1 ,1,e
=1);if(e ){if(C)p(); if(m(1,1,0)&m (-1,1,0 )&m( 1,S, 0)&m(-1,S ,0))goto q;
usleep(2048*8);}}q:; } /*nsfisis*/
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