Percolation in Java -

Percolation in Java -

i having problem percolation programme in java using weighted quick union think there either bug in main utilize union tell locations connected or there problem test running see if grid percolates if has feed appreciate it.

/* class test percolation of n n grid*/ public class percolation{ weightedquickunionuf uf; boolean[][] grid; public int size; int opensites;//keeps track of open sites /*constructor percolation takes n argument * create n*n grid **/ public percolation(int n){ this.size=n; int spaces= n*n; uf = new weightedquickunionuf(spaces+1);//initializes wquuf info structure. opensites=0;//intializes open sites 0. this.grid = new boolean[n][n];// makes boolean array 2d n n representing grid for(int i=0;i<n;i++){//i represents x coordinate for(int j=0;j<n;j++){// j represents y coordinate grid[i][j]=false; //sets spaces closed }//end j loop }//end loop for(int i=0;i<size;i++){ uf.union(size*size,i); }// end connects top sites }// end constructor; /* * takes ints x , y coordinates * , opens square on grid **/ public void open(int i, int j){ if(!(this.grid[i][j])){ this.grid[i][j]=true; opensites+=1; } }//end open /* * takes ints x , y coordinates , * returns true if space open , false * if not **/ public boolean isopen(int i, int j){ homecoming grid[i][j]; }//end isopen /* * takes ints x , y coordinates , * returns true if space total , false * if not */ public boolean isfull(int i, int j){ if(isopen(i,j)){ if(uf.connected((i+j*size),(size*size))){ homecoming true;} }//end homecoming false; }//end isfull /* * checks if space on bottom total returns true * if there 1 false other wise */ public boolean percolates(){ for(int i=0;i<size;i++){ if(isfull(i,size-1)) homecoming true; } homecoming false; }//end percolates /* * prints out grid * --------------------- * 0 false true false * 1 true true true * 2 false true true * --------------------- */ public void printgrid(){ stdout.println("----------------------------------"); for(int x = 0;x < size;x++){ for(int y = 0; y < size; y++){ string mark=isopen(x,y) ? "x": "0"; stdout.print("|"+mark+"|"); } stdout.println(); } stdout.println("----------------------------------"); } /* * main method takes 2 int arguments 1 number * of tests run , 1 size of grid **/ public static void main(string[] args) { int tests=stdin.readint(); int size=stdin.readint(); int testedtimes=1; int spaces=size*size-1; int check=0; int space=0; while(testedtimes<=tests){ percolation perc = new percolation(size); stdout.println("before anything"); perc.printgrid(); while(!perc.percolates()){ int x=stdrandom.uniform(0,size); int y=stdrandom.uniform(0,size); perc.open(x,y); space=x+(y*size); if((space+1<spaces)&&(x<size-1)){//right 1 if(perc.isopen(x+1,y)){ perc.uf.union(space,space+1); } } if((space-1>0)&&(x>0)){//left 1 if(perc.isopen(x-1,y)){ perc.uf.union(space,space-1); } } if((space-size>0)&&(y-1>0)){//up 1 if(perc.isopen(x,y-1)){ perc.uf.union(space,space-size); } } if((space+size<spaces)&&(y+1<=size)){//down 1 if((perc.isopen(x,y+1))){ perc.uf.union(space,space+size); } perc.printgrid(); } }//end while(!percolates()) testedtimes++; }//end while(testedtimes<tests) }//end main. }//end class

it seems me percolating left right , not top button (you using column , j row).

try alter printgrid, utilize isopen(y,x) instead of isopen(x,y).

java