#include <stdio.h>
#include <stdlib.h>

#define  nil		0
#define	 false		0
#define  true		1
#define  bubblebase	1.61f
#define  dnfbase 	3.5f
#define  permbase 	1.75f
#define  queensbase 1.83f
#define  towersbase 2.39f
#define  quickbase 	1.92f
#define  intmmbase 	1.46f
#define  treebase 	2.5f
#define  mmbase 	0.0f
#define  fpmmbase 	2.92f
#define  puzzlebase	0.5f
#define  fftbase 	0.0f
#define  fpfftbase 	4.44f
    /* Towers */
#define maxcells 	 18

    /* Intmm, Mm */
#define rowsize 	 40

    /* Puzzle */
#define size	 	 511
#define classmax 	 3
#define typemax 	 12
#define d 		     8

    /* Bubble, Quick */
#define sortelements 5000
#define srtelements  500

    /* fft */
#define fftsize 	 256
#define fftsize2 	 129
/*
type */
    /* Perm */
#define permrange     10

   /* tree */
struct node {
	struct node *left,*right;
	int val;
};

    /* Towers */ /*
    discsizrange = 1..maxcells; */
#define    stackrange	3
/*    cellcursor = 0..maxcells; */
struct    element {
	int discsize;
	int next;
};
/*    emsgtype = packed array[1..15] of char;
*/
    /* Intmm, Mm */ /*
    index = 1 .. rowsize;
    intmatrix = array [index,index] of integer;
    realmatrix = array [index,index] of real;
*/
    /* Puzzle */ /*
    piececlass = 0..classmax;
    piecetype = 0..typemax;
    position = 0..size;
*/
    /* Bubble, Quick */ /*
    listsize = 0..sortelements;
    sortarray = array [listsize] of integer;
*/
    /* FFT */
struct    complex { float rp, ip; } ;
/*
    carray = array [1..fftsize] of complex ;
    c2array = array [1..fftsize2] of complex ;
*/

float value, fixed, floated;

    /* global */
long    seed;  /* converted to long for 16 bit WR*/

    /* Perm */
int    permarray[permrange+1];
/* converted pctr to unsigned int for 16 bit WR*/
unsigned int    pctr;

    /* tree */
struct node *tree;

    /* Towers */
int	   stack[stackrange+1];
struct element    cellspace[maxcells+1];
int    freelist,  movesdone;

    /* Intmm, Mm */

int   ima[rowsize+1][rowsize+1], imb[rowsize+1][rowsize+1], imr[rowsize+1][rowsize+1];
float rma[rowsize+1][rowsize+1], rmb[rowsize+1][rowsize+1], rmr[rowsize+1][rowsize+1];

    /* Puzzle */
int	piececount[classmax+1],	class[typemax+1], piecemax[typemax+1];
int	puzzl[size+1], p[typemax+1][size+1], n, kount;

    /* Bubble, Quick */
int sortlist[sortelements+1], biggest, littlest, top;

    /* FFT */
struct complex    z[fftsize+1], w[fftsize+1], e[fftsize2+1];
float    zr, zi;

void Initrand () {
    seed = 74755L;   /* constant to long WR*/
}

int Rand () {
    seed = (seed * 1309L + 13849L) & 65535L;  /* constants to long WR*/
    return( (int)seed );     /* typecast back to int WR*/
}


    /* The eight queens problem, solved 50 times. */
/*
	type
	    doubleboard =   2..16;
	    doublenorm  =   -7..7;
	    boardrange  =   1..8;
	    aarray      =   array [boardrange] of boolean;
	    barray      =   array [doubleboard] of boolean;
	    carray      =   array [doublenorm] of boolean;
	    xarray      =   array [boardrange] of boardrange;
*/

void Try(int i, int *q, int a[], int b[], int c[], int x[]) {
	int     j;
	j = 0;
	*q = false;
	while ( (! *q) && (j != 8) ) {
		j = j + 1;
		*q = false;
		if ( b[j] && a[i+j] && c[i-j+7] ) {
			x[i] = j;
		    b[j] = false;
		    a[i+j] = false;
		    c[i-j+7] = false;
		    if ( i < 8 ) {
		    	Try(i+1,q,a,b,c,x);
				if ( ! *q ) {
					b[j] = true;
				    a[i+j] = true;
				    c[i-j+7] = true;
				}
			}
		    else *q = true;
	    }
	}
}

void Doit () {
	int i,q;
	int a[9], b[17], c[15], x[9];
	i = 0 - 7;
	while ( i <= 16 ) {
		if ( (i >= 1) && (i <= 8) ) a[i] = true;
	    if ( i >= 2 ) b[i] = true;
	    if ( i <= 7 ) c[i+7] = true;
	    i = i + 1;
	}

	Try(1, &q, b, a, c, x);
	if ( !q ) printf (" Error in Queens.\n");
}

void Queens (int run) {
    int i;
    for ( i = 1; i <= 50; i++ ) Doit();
	 printf("%d\n", run + 1);
}

int main()
{
	int i;
	for (i = 0; i < 20; i++) Queens(i);
	return 0;
}
