Soulution To N-queen's Problem - Games and Graphics Source Code in C

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Home » C Home » Games and Graphics Home » Soulution To N-queen's Problem

A D V E R T I S E M E N T

Title	Soulution To N-queen's Problem
Author	Onkar Vinayak Deshpande
Author Email	onkar_v [at] rediffmail.com
Description
Category	C » Games and Graphics
Hits	384623
Code	Select and Copy the Code
Code : /* modified final/ #include<stdio.h> #include<conio.h> #include<graphics.h> #include<dos.h> #include<math.h> #include<process.h> //Functions used void about_prog(); void gotorc ( int, int ) ; void mainmenu ( ) ; void drawbox ( int, int, int, int, int, int ) ; void writechar ( char, int, int, int, int ) ; void writestring ( char, int, int, int, int, int = 0 ) ; void clrwin ( int=0, int=0, int=25, int=80, int=7, int=0 ) ; void rules ( ) ; void about ( ) ; void quit ( ) ; void back ( ) ; void initmouse(void); void yesmouse(void); void nomouse(void); void mouse(void); void limmouse(int,int,int,int); void background(); void first_screen(); void loadprog(); void acceptsize(); void error_mesg(); int possible_results(); int search_rowcol(); void doneby(); void fill_poly(int,int,int,int,int,int); void draw_chess_board(); void erase(); void drawcircle(); void acceptbymouse(); void acceptbykeyboard(); int placequeen(int,int,int); void diagonal_1_check(int,int,int,int); void diagonal_2_check(int,int,int,int); void column(int,int,int,int); void result(); //Global Variables int exit_p; int chess[50][50]; int placed_row,size,row,col,x,y,radiusx,radiusy,ro,co,text_x=1; int iRow,iCol,iStatus; long int total_no_of_nodes,temp; long int count_exceed; int x_center = 320, y_center = 200, rad = 100,p[100],q[100]; long int count_num=0; union REGS i,o; char far scr=(char far ) 0xB8000000L ; //screen address char ch, menu[]= { " MENU * ", " ^Instructions ", " ^Enter Size Of ChessBoard ", " ^Use Mouse To place Queen ", " ^USE Keyboard To Place Queen ", " ^Possible Solutions ", " ^Exit " }; void about_prog() { clrwin ( 0, 0, 25, 80, 0, 3 ) ; drawbox ( 2, 2, 22, 75, 0, 8 ) ; writestring ( "About Program", 30, 2, 14, 0 ) ; writestring ( "* A Classic Combinatorial Problem Is To Place N-Queens on N by N", 3, 4, 11, 0) ; writestring ( "ChessBoard So That No Two 'Attack',that is,so that no two of them ", 5, 6, 11, 0 ) ; writestring ( "are on the same row,column or diagonal.", 5, 8, 11, 0 ) ; writestring ( "* This Problem Is Solved By 'BackTracking',BackTracking is a", 3,10,11, 0 ) ; writestring ( "Algorithmic Strategy.", 5, 12, 15, 0 ) ; writestring ( "* In This Program You Have To Choose a Position On ChessBoard For", 3, 14, 12, 0 ) ; writestring ( "a Queen Then The BackTracking Algorithm Places All N-1 Queens", 5, 16, 12, 0 ) ; writestring ( "On Right Place Satisfing Above Conditions.", 5, 18, 12, 0 ) ; writestring ( "* Number Of All Possible Solutions For Placed Positions Can Be Viewed.", 3, 18, 13, 0 ) ; writestring ( "Press Any Key To Continue", 50, 21, 13, 0 ) ; getch(); } void error_mesg() { int gd=DETECT,gm; initgraph(&gd,&gm,"..\bgi"); cleardevice(); background(); fill_poly(100,200,550,250,12,10); settextstyle(8, HORIZ_DIR, 3); setcolor(15); } void loadprog() { int i; _setcursortype(_NOCURSOR); drawbox ( 10, 30, 13, 50, 2, 0 ) ; writestring ( "Loading.... ", 32, 11, 0, 2, 1 ) ; gotoxy(1,25); textcolor(CYAN); for(i=0;i<79;i++) { cprintf("?"); delay(20); } } void acceptsize() { int i,j; _setcursortype(_NOCURSOR); clrwin ( 0, 0, 25, 80, 0, 1 ) ; do { drawbox ( 10, 20, 14, 65, 2, 0 ) ; writestring ( "ENTER THE SIZE OF CHESSBOARD (4 TO 25): ", 22, 12, 0, 2, 1 ) ; _setcursortype(_NORMALCURSOR); gotorc ( 12,61) ; scanf("%d",&size); _setcursortype(_NOCURSOR); }while(size<4 \|\| size>26); total_no_of_nodes=0; for(j=0;j<size;j++) { temp=1; for(i=0;i<=j;i++) { temp=temp(size-i); } total_no_of_nodes=total_no_of_nodes+temp; } //total_no_of_nodes=temp; for(i=0;i<size;i++) { for(j=0;j<size;j++) { chess[i][j]=-1; } } radiusy=((479/size))/2-3; radiusx=((479/size))/2-3; } int possible_results() { int gd=DETECT,gm,i,j,ex; char buff[5]; initgraph(&gd,&gm,"..\bgi"); draw_chess_board(); setcolor(10); settextstyle(1,0,3); outtextxy(500,100,"Solution"); outtextxy(500,120,"Number"); sprintf(buff,"%d",count_num+1); outtextxy(500,140,buff); x=y=((getmaxy()/size)/2); for(i=0;i<size;i++) { x=((getmaxy()/size)/2); for(j=0;j<size;j++) { if(chess[i][j]==(i+50)) { setcolor(6); setfillstyle(9,6); fillellipse(x,y,radiusx,radiusy); } x=x+((getmaxy()/size)); } y=y+((getmaxy()/size)); } ex=getch(); if(ex==0) ex=getch(); if(ex==27) { closegraph(); return 1; } closegraph(); return 0; } void cal_positions(int a,int index,int row,int ptr) { int i,j,b[50],k,placed,l,m,remove; if(exit_p==0) { if(index >= 1) { i=0; j=1; k=0; for(i=1;i<=size;i++) { for(j=0;j<ptr;j++) { if(a[j]==i) break; } if(j==ptr) b[k++]=i; } i=j=0; while(i<index && exit_p==0) { remove=0; if(chess[row][b[i]-1]==-1&& exit_p==0) { chess[row][b[i]-1]=(row+50); diagonal_1_check(row,b[i]-1,row,-1); diagonal_2_check(row,b[i]-1,row,-1); column(row,b[i]-1,row,-1); remove=1; a[ptr]=b[i]; cal_positions(a,index-1,row+1,ptr+1); } if(remove==1 && exit_p==0) { chess[row][b[i]-1]=-1; diagonal_1_check(row,b[i]-1,-1,row); diagonal_2_check(row,b[i]-1,-1,row); column(row,b[i]-1,-1,row); } i++; } } else { exit_p=possible_results(); count_num++; } } } void instructions( ) // RULES { clrwin ( 0, 0, 25, 80, 0, 3 ) ; drawbox ( 2, 2, 21, 75, 0, 8 ) ; writestring ( "INSTRUCTIONS", 30, 2, 12, 0 ) ; writestring ( "YOU CAN USE KEYBOARD OR MOUSE TO PLACE A QUEEN", 5, 4, 11, 0) ; writestring ( "* USING KEYBOARD", 5, 6, 4, 0 ) ; writestring ( " - USE ARROW KEYS TO GO UP,DOWN,LEFT,RIGHT.", 10, 8, 11, 0 ) ; writestring ( " - THEN PRESS ENTER TO PLACE A QUEEN", 10,10,11, 0 ) ; writestring ( "~* USING MOUSE ", 5, 12, 4, 0 ) ; writestring ( "- FIRST LEFTCLICK ON BUTTON 'PLACED' WHICH IS AT RIGHT TOP.", 10, 14, 11, 0 ) ; writestring ( "- THEN SELECT A PLACE ON CHESSBOARD BY RIGHTCLICK. ", 10, 16, 11, 0 ) ; writestring ( "* THEN WAIT FOR FEW MINUTES", 5, 18, 13, 0 ) ; writestring ( "Press Any Key To Continue", 50, 20, 13, 0 ) ; getch(); } void writestring(charstr,int row,int col,int fore, int back, int del ) { //WRITES A STRING TO THE SCREN int x = 30 del ; // DEL = 1 IF THERE SHOULD BE A DELAY IN DISPLAY // 0 OTHER WISE. IT IS SET TO ZERO BY DEFAULT while ( str ) { // THE NEXT CHAR WILL BE DISPLAYED IN ATTRIBUTED MANNER if ( str == '^' ) // HOT KEYS { str++ ; writechar (str++, row++, col, 1, back ) ; delay ( x ) ; nosound ( ) ; delay ( x ) ; } else if ( str == 126 ) // HOT KEYS { str++; writechar(str++, row++, col, 10, back ); delay ( x ) ; nosound ( ) ; delay ( x ) ; } else { writechar (str++, row++, col, fore, back ) ; delay ( x ) ; nosound ( ) ; delay ( x ) ; } } nosound ( ) ; return ; } void clrwin(int sr,int sc,int er,int ec,int fore, int back) { // CLEARS THE WINDOW WITH THE GIVEN FOREGROUND AND BACKGROUND COLOR i.h.ah=6; i.h.al=0; i.h.ch=sr; i.h.cl=sc; i.h.dh=er; i.h.dl=ec; i.h.bh=back16+fore; int86(0x10,&i,&i); //clears the screen gotorc ( 0, 0 ) ; //moves the cursor to the appropriate position } void gotorc ( int r, int c ) { // MOVES THE CURSOR TO THE APPROPRIATE LOCATION REGS i, o ; i.h.ah = 2 ; i.h.bh = 0 ; i.h.dh = r ; i.h.dl = c ; int86 ( 16, &i, &o ) ; } void drawbox ( int starty, int startx, int endy, int endx, int color, int shad ) { // FUNCTION TO DRAW THE BOX // JUST STEP THRU THE FUNCTION USING F7 KEY int i, j ; if ( starty > endy \|\| startx > endx \|\| color > 7 ) return ; for ( i = startx ; i < endx ; i ++ ) { for ( j = starty ; j < endy ; j ++ ) writechar ( ' ', i, j, 0, color ) ; writechar ( 219, i + 1, endy, shad, 0 ) ; } for ( i = endy ; i >= starty + 1 ; i -- ) { writechar ( 219, endx, i, shad, 0 ) ; writechar ( 219, endx + 1, i, shad, 0 ) ; } } void writechar(char ch,int row,int col,int fore, int back) { ( scr + col * 160 + row * 2 ) = ch ; * ( scr + col * 160 + row * 2 + 1 ) = back * 16 + fore ; return ; } void doneby() { int i,j,z,c; int gd=DETECT,gm; initgraph(&gd,&gm,"..\bgi"); x_center = 320, y_center = 200; rad=100; setcolor(13); line(40,70,590,70); setcolor(2); rectangle(50,340,590,420); setcolor(10); settextstyle(5,0,5); outtextxy(55,345,"Onkar V Deshpande"); settextstyle(4,0,3); for(i=1;i<=640;i++) { setcolor(9); line(i,20,i,20); line(i,30,i,30); delay(1); } for(j=10;j<=460;j++) { setcolor(9); line(610,j,610,j); line(620,j,620,j); delay(1); } for( z=640;z>=1;z--) { line(z,435,z,435); line(z,445,z,445); delay(1); } for( c=460;c>=10;c--) { setcolor(9); line(20,c,20,c); line(30,c,30,c); delay(1); } for ( i = 0; i < 10; i++ ) { p[i] = x_center + rad * cos(36i3.14159/180); q[i] = y_center + rad * sin(36i3.14159/180); } for ( i = 0; i < 10; i++ ) { for ( j = 0; j < 10; j++ ) { setcolor(14); line(p[i],q[i],p[j],q[j]); delay(25); } } delay(500); closegraph(); error_mesg(); outtextxy(250,210, "Thank You"); gotoxy(50,24); printf( "Press Any Key To Exit"); getch(); } void fill_poly(int x1,int y1,int x2,int y2,int color,int style) { int poly[8],i; poly[0] = x1; poly[1] = y1; poly[2] = x2; poly[3] = y1; poly[4] = x2; poly[5] = y2; poly[6] = x1; poly[7] = y2; setfillstyle(style,color); setcolor(color); fillpoly(4, poly); } void background() { int gd=DETECT,gm; initgraph(&gd,&gm,"..\bgi"); fill_poly(0,20,getmaxx(),40,11,11); fill_poly(getmaxx()-40,0,getmaxx()-20,getmaxy(),11,11); fill_poly(0,getmaxy()-40,getmaxx(),getmaxy()-20,11,11); fill_poly(20,0,40,getmaxy(),11,11); } void first_screen() { int i,j,k; fill_poly(125,50,500,100,12,10); settextstyle(10, HORIZ_DIR, 3); setcolor(10); outtextxy(135,50, "N-Queen's Problem"); fill_poly(125,300,500,350,12,10); settextstyle(7, HORIZ_DIR, 3); setcolor(11); outtextxy(135,300, "N-Queen's Problem"); fill_poly(50,50,100,350,12,10); settextstyle(8, 1, 3); setcolor(12); outtextxy(50,55, "N-Queen's Problem"); fill_poly(525,50,575,350,12,10); settextstyle(5, 1, 3); setcolor(13); outtextxy(525,50, "N-Queen's Problem"); gotoxy(50,25); printf("Press any key to continue"); for ( i = 0; i < 10; i++ ) { p[i] = x_center + rad * cos(36i3.14159/180); q[i] = y_center + rad * sin(36i3.14159/180); } for ( i = 0; i < 10; i++ ) { for ( j = 0; j < 10; j++ ) { setcolor(14); line(p[i],q[i],p[j],q[j]); delay(50); } } getch(); } void initmouse(void) { iRow = 0,iCol = 0,iStatus = 0; asm{ mov ax,0; int 0x33; } } void yesmouse(void) { asm{ mov ax,1; int 0x33; } } void nomouse(void) { asm{ mov ax,2; int 0x33; } } void mouse(void) { asm{ mov ax,3; int 0x33; mov iRow,dx; mov iCol,cx; mov iStatus,bx; } } void limmouse(int iMinX,int iMinY,int iMaxX,int iMaxY) { yesmouse(); asm{ mov ax,7 mov cx,iMinX mov dx,iMaxX int 0x33 } asm{ mov ax,8 mov cx,iMinY mov dx,iMaxY int 0x33 } } void draw_chess_board() { int color1,color2,poly[8],i,j; x=0;y=0; color1=1; color2=0; for(i=0;i<size;i++) { color1=color2; for(j=0;j<size;j++) { if(color1==1) color1=0; else if(color1==0) color1=1; setcolor(2); rectangle(x,y,x+(getmaxy()/size),y+(getmaxy()/size)); poly[0] = x; poly[1] = y; poly[4] = x+(getmaxy()/size); poly[5] = y+(getmaxy()/size); poly[2] = x+(getmaxy()/size); poly[3] = y; poly[6] = x; poly[7] = y+(getmaxy()/size); setcolor(2); if(color1!=0) { setfillstyle(1,color1); fillpoly(4,poly); x=x+getmaxy()/size; } else { rectangle(x,y,x+getmaxy()/size,getmaxy()/size); x=x+getmaxy()/size; } } if(color2==1) color2=0; else if(color2==0) color2=1; x=0; y=y+getmaxy()/size; } } void result() { int gd=DETECT,gm,count,i,j; initgraph(&gd,&gm,"..\bgi"); draw_chess_board(); settextstyle(3,0,4); setcolor(5); outtextxy(500,5,"Solution"); outtextxy(500,50,"Found"); setcolor(2); rectangle(495,150,getmaxx(),479); setcolor(15); settextstyle(1,0,1); outtextxy(500,200,"This Queen Is"); outtextxy(500,220,"Placed By User"); setcolor(4); setfillstyle(10,4); fillellipse(550,180,20,20); setcolor(15); outtextxy(500,300,"These Queens"); outtextxy(500,320,"Are Placed"); outtextxy(500,340,"According to"); outtextxy(500,360,"Queen Placed"); outtextxy(500,380,"By User"); setcolor(6); setfillstyle(9, 6); fillellipse(550,280,20,20); x=y=((getmaxy()/size)/2); for(i=0;i<size;i++) { x=((getmaxy()/size)/2); for(j=0;j<size;j++) { if(chess[i][j]==(i+50)) { if(i==placed_row) { setcolor(4); setfillstyle(10, 4); } else { setcolor(6); setfillstyle(9, 6); } fillellipse(x,y,radiusx,radiusy); } x=x+((getmaxy()/size)); } y=y+((getmaxy()/size)); } getch(); closegraph(); } void erase() { int pixel; pixel=getpixel(x+radiusx+1,y); setcolor(pixel); setfillstyle(1,pixel); fillellipse(x,y,radiusx,radiusy); } void drawcircle() { setcolor(4); setfillstyle(10,4); fillellipse(x,y,radiusx,radiusy); } int search_rowcol() { y=0; for(ro=0;ro<size;ro++) { x=0; for(co=0;co<size;co++) { if(x<iCol && iCol<(x+479/size) && y<iRow && iRow<(y+479/size)) { return 1; } x=x+(479/size); } y=y+(479/size); } return 0; } void acceptbymouse() { int prevx,prevy,break_flag,pressed,valid; int gd=DETECT,gm; initgraph(&gd,&gm,"..\bgi"); draw_chess_board(); initmouse(); limmouse(0,0,getmaxx()-50,getmaxy()); yesmouse(); fill_poly(495,15,605,45,11,1); fill_poly(500,20,600,40,5,1); setcolor(14); settextstyle(5,0,3); outtextxy(525,12,"Place"); setcolor(15); settextstyle(1,0,3); outtextxy(500,100,"To Place"); outtextxy(500,120,"A Queen"); outtextxy(500,140,"LeftClick"); outtextxy(500,160,"On Button"); outtextxy(500,180,"'Placed' "); while(1) { mouse(); if(iStatus==1 && 500<=iCol &&iCol<=605 && 15<=iRow &&iRow<=40) { nomouse(); fill_poly(495,15,605,50,0,1); break; } } prevx=0;prevy=0; fill_poly(500,0,getmaxx(),getmaxy(),0,1); setcolor(15); settextstyle(1,0,3); outtextxy(500,100,"To Place"); outtextxy(500,120,"A Queen"); outtextxy(500,140,"RightClick"); outtextxy(500,160,"On Proper"); outtextxy(500,180,"Place"); while(1) { yesmouse(); mouse(); if(iStatus==2) { break; } valid=search_rowcol(); if(valid==1) { if(prevx<iCol && iCol<(prevx+479/size) && prevy<iRow && iRow<(prevy+479/size)) { nomouse(); setcolor(15); prevx=x;prevy=y; rectangle(x,y,x+(479/size),y+(479/size)); } else { setcolor(2); rectangle(prevx,prevy,prevx+(479/size),prevy+(479/size)); nomouse(); setcolor(15); prevx=x;prevy=y; rectangle(x,y,x+(479/size),y+(479/size)); } yesmouse(); } } nomouse(); x=x+(479/size)/2; y=y+(479/size)/2; drawcircle(); placed_row=ro; placequeen(ro,co,0); delay(1000); closegraph(); } void acceptbykeyboard() { int gd=DETECT,gm,c,i,j; initgraph(&gd,&gm,"..\bgi"); draw_chess_board(); x=(getmaxy()/size)/2; y=(getmaxy()/size)/2; i=0;j=0; drawcircle(); do { c=getch(); if(c==0) c=getch(); if(c==72 && y-(getmaxy()/size)>0) { erase(); y=y-(getmaxy()/size); drawcircle(); i--; } else if(c==80 && y+(getmaxy()/size)<479) { erase(); y=y+(getmaxy()/size); drawcircle(); i++; } else if(c==75&& x-(getmaxy()/size)>0) { erase(); x=x-(getmaxy()/size); drawcircle(); j--; } else if(c==77 &&x+(getmaxy()/size)<479) { erase(); x=x+(getmaxy()/size); drawcircle(); j++; } if(c==13) { drawcircle(); placed_row=i; placequeen(i,j,0); c=27; } }while(c!=27); closegraph(); } int placequeen(int i,int j,int break_up) { int j1; if(break_up==0) { count_exceed++; if(count_exceed>total_no_of_nodes) { error_mesg(); outtextxy(110,210, "Sorry,Solution Is Not Possible !!"); gotoxy(50,24); printf( "Press Any Key To Continue"); getch(); closegraph(); return 1; } for(j1=j;j1<size;j1++) { if(chess[i][j1]==-1) { textcolor(3); gotoxy(text_x++,25); cprintf("?"); chess[i][j1]=(i+50); diagonal_1_check(i,j1,i,-1); diagonal_2_check(i,j1,i,-1); column(i,j1,i,-1); break; } } if(j1==size) { if(i-1!=placed_row) { i--; row--; } else { i=i-2; row=row-2; } for(j=0;j<size;j++) { if(chess[i][j]==(i+50)) break; } chess[i][j]=-1; diagonal_1_check(i,j,-1,i); diagonal_2_check(i,j,-1,i); column(i,j,-1,i); textcolor(0); textbackground(0); gotoxy(--text_x,25); cprintf(" "); break_up=placequeen(row,j+1,0); } } return 0; } void diagonal_1_check(int i1,int j1,int val,int check) { int i2,j2; i2=i1; j2=j1; i2--;j2--; while(i2>=0&&j2>=0) { if(check==chess[i2][j2]) chess[i2][j2]=val; i2--;j2--; } i2=i1; j2=j1; i2++;j2++; while(i2<size&&j2<size) { if(check==chess[i2][j2]) chess[i2][j2]=val; i2++;j2++; } } void diagonal_2_check(int i1,int j1,int val,int check) { int i2,i3,j2; i2=i1; j2=j1; i2--;j2++; while(i2>=0&&j2<size) { if(check==chess[i2][j2]) chess[i2][j2]=val; i2--;j2++; } i2=i1; j2=j1; i2++;j2--; while(i2<size&&j2>=0) { if(check==chess[i2][j2]) chess[i2][j2]=val; i2++;j2--; } } void column(int i1,int j1,int val,int check) { int j2; for(j2=0;j2<size;j2++) { if(chess[i1][j2]==check) { chess[i1][j2]=val; } } for(j2=0;j2<size;j2++) { if(chess[j2][j1]==check) { chess[j2][j1]=val; } } } void main() { int i,j,choice,status,breakup,b[50]; background(); // first_screen(); closegraph(); loadprog(); about_prog(); size=-1; choice=1; do { clrwin ( 0, 0, 25, 80, 0, 1 ) ; drawbox ( 5, 20, 20, 55, 4, 0 ) ; _setcursortype(_NOCURSOR); for ( int i = 0 ; i <= 6 ; i ++ ) { if ( choice == i ) writestring ( menu[i], 20, 7 + 2 * i, 0, 10 ) ; else writestring ( menu[i], 20, 7 + 2 * i, 10, 4 ) ; } status=getch(); if(status==0) status=getch(); switch(status) { case 72:if(choice==1) choice=6; else choice--; break; case 80:if(choice==6) choice=1; else choice++; break; case 13: if(choice==1) instructions(); else if(choice==2) { acceptsize(); } else if(choice==6) { doneby(); exit(0); } else if(size==-1) { error_mesg(); outtextxy(110,210, "First Enter Size Of ChessBoard"); gotoxy(50,24); printf( "Press Any Key To Continue"); getch(); closegraph(); } else if(choice==5) { for(i=0;i<size;i++) { b[i]=0; } exit_p=0; cal_positions(b,size,0,0); } else if(choice==4\|\|choice==3) { if(choice==4) acceptbykeyboard(); else if(choice==3) acceptbymouse(); gotoxy(30,13); textcolor(3); textbackground(1); printf("Placing Please Wait........"); row=0; count_exceed=0; breakup=0; while(row!=size &&breakup==0) { if(row==placed_row) row++; if(row==size) break; breakup=placequeen(row,0,0); row++; } if(breakup==0) { for(i=text_x;i<79;i++) { textcolor(2); cprintf("?"); delay(30); } result(); } } break; } }while(1); } DeleteReplyForwardSpamMove...

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