#include <iostream.h>
#include <stdlib.h>
#include <time.h>
const int chessboardsize=40; //size of chessboard
enum{empty, queen, used}; //status
struct move{ //movement direction
int x;
int y;
};
struct chessboard{ //chessboard type
int size;
int square[chessboardsize][chessboardsize];
int usedsquares;
int noqueens;
};
void setqueenmovdi(move *whatmove, chessboard *board, move *curcoor);
void main()
{
move curcoor;
move NE; NE.x=1; NE.y=1; //define digonal movements
move NW; NW.x=-1; NW.y=1;
move SE; SE.x=1; SE.y=-1;
move SW; SW.x=-1; SW.y=-1;
chessboard board;
board.size=chessboardsize;
// srand(time(0));
while(board.noqueens!=board.size ){
board.usedsquares=0;
board.noqueens=0;
for(int i=0;i<board.size;i++)for(int j=0;j<board.size;j++)board.square[i][j]=0;
while(board.usedsquares<board.size*board.size)
{
curcoor.x=rand()%board.size;
curcoor.y=rand()%board.size;;
if(board.square[curcoor.x][curcoor.y]==empty){
board.square[curcoor.x][curcoor.y]=queen;
++board.usedsquares;
++board.noqueens;
}else continue;
for(int horiz=0;horiz<board.size;horiz++)if(board.square[horiz][curcoor.y]==empty){board.square[horiz][curcoor.y]=used;++board.usedsquares;}
for(int verti=0;verti<board.size;verti++)if(board.square[curcoor.x][verti]==empty){board.square[curcoor.x][verti]=used;++board.usedsquares;}
board.square[curcoor.x][curcoor.y]=queen;
setqueenmovdi(&NE,&board,&curcoor);
setqueenmovdi(&NW,&board,&curcoor);
setqueenmovdi(&SE,&board,&curcoor);
setqueenmovdi(&SW,&board,&curcoor);
}
}
cout<<endl;
for(int i2=0;i2<board.size;i2++){
for(int j2=0;j2<board.size;j2++)cout<<board.square[i2][j2];
cout<<endl;
}
}
void setqueenmovdi(move *whatmove,chessboard *board,move *curcoor)
{
move next;
next.x=curcoor->x+whatmove->x; next.y=curcoor->y+whatmove->y;
if(next.x<0||next.x>board->size-1||next.y<0||next.y>board->size-1)return;
if(board->square[next.x][next.y]==empty){
board->square[next.x][next.y]=used;
++board->usedsquares;
}
setqueenmovdi(whatmove,board,&next);
return;
}
