static class Vec2{
  float x,y;
  Vec2(){
    x = -1;
    y = -1;
  }
  Vec2(float x, float y){
    this.x = x;
    this.y = y;
  }
  boolean equals(float x, float y){
    if(this.x == x && this.y == y) return true;
    else return false;
  }
  float dist(Vec2 other){
    float dx = this.x - other.x;
    float dy = this.y - other.y;
    return sqrt(dx*dx + dy*dy);
  }
}
static class geoNeuron{
  double x,y;
  double wx,wy;
  geoNeuron(double x, double y){
    this.x = x;
    this.y = y;
    this.wx = Math.random();
    this.wy = Math.random();
  }
  double dist(geoNeuron c){
    double dx = this.x - c.x;
    double dy = this.y - c.y;
    return Math.sqrt(dx*dx + dy*dy);	
  }
  double wdist(geoNeuron c){
    double dx = this.wx - c.wx;
    double dy = this.wy - c.wy;
    return Math.sqrt(dx*dx + dy*dy);		
  }
}