2013-Detect-Squares.cs

publicclassDetectSquares{

privateDictionary<(intx,inty),int>_pointsCounter=new();
privateList<(intx,inty)>_points=new();

publicDetectSquares(){}

publicvoidAdd(int[]point){
varp=(point[0],point[1]);
_points.Add(p);
_pointsCounter[p]=1+_pointsCounter.GetValueOrDefault(p,0);
}

publicintCount(int[]point){
intpx=point[0],py=point[1];
intresult=0;

foreach(var(x,y)in_points){

if(Math.Abs(px-x)!=Math.Abs(py-y)
||x==px||y==py){
continue;
}
result+=_pointsCounter.GetValueOrDefault((px,y),0)*_pointsCounter.GetValueOrDefault((x,py),0);
}
returnresult;
}
}

/**
 * Your DetectSquares object will be instantiated and called as such:
 * DetectSquares obj = new DetectSquares();
 * obj.Add(point);
 * int param_2 = obj.Count(point);
 */