26.md

Determine if a Cell Is Reachable at a Given Time

  bool isReachableAtTime(int sx, int sy, int fx, int fy, int t) {
        
        if(fx==sx && fy==sy)
            return t>1 || t==0;
       
        int dist=max(abs(sx-fx),abs(sy-fy));

        if(dist<=t)
            return true;
        return false;
    }