ghelp

int w=7, h=6, bs=100, player=1;
int[][] board = new int [h][w];

void setup() {
size(700, 600);
ellipseMode(CORNER);
}

int nextSpace (int x) {
for(int y=h-1;y>=0;y--)
if(board[y][x]==0)
return y;
return -1;
}



void mousePressed() {
int x = mouseX/bs, y = nextSpace(x);
if(y>=0){
board[y][x]=player;
player = player==1?2:1;
}
}

void draw() {
for (int j=0;j<h;j++){
for (int i=0;i<w;i++){
fill(255);
rect(i*bs, j*bs,bs,bs);
if(board[j][i]>0){
fill(board[j][i]==1?255:0, board[j][i]==2?255:0,0);
ellipse(i*bs,j*bs,bs,bs);
}
}
}
}