Problem:
Score : 500 points

Problem Statement

There is an infinitely long street that runs west to east, which we consider as a number line.

There are N roadworks scheduled on this street.
The i-th roadwork blocks the point at coordinate X_i from time S_i - 0.5 to time T_i - 0.5.

Q people are standing at coordinate 0. The i-th person will start the coordinate 0 at time D_i, continue to walk with speed 1 in the positive direction and stop walking when reaching a blocked point.

Find the distance each of the Q people will walk.

Constraints

All values in input are integers.

1 \leq N, Q \leq 2 \times 10^5

0 \leq S_i < T_i \leq 10^9

1 \leq X_i \leq 10^9

0 \leq D_1 < D_2 < ... < D_Q \leq 10^9

If i \neq j and X_i = X_j, the intervals [S_i, T_i) and [S_j, T_j) do not overlap.

Input

Input is given from Standard Input in the following format:

N Q
S_1 T_1 X_1
:
S_N T_N X_N
D_1
:
D_Q

Output

Print Q lines. The i-th line should contain the distance the i-th person will walk or -1 if that person walks forever.

Sample Input 1

4 6
1 3 2
7 13 10
18 20 13
3 4 2
0
1
2
3
5
8

Sample Output 1

2
2
10
-1
13
-1

The first person starts coordinate 0 at time 0 and stops walking at coordinate 2 when reaching a point blocked by the first roadwork at time 2.

The second person starts coordinate 0 at time 1 and reaches coordinate 2 at time 3. The first roadwork has ended, but the fourth roadwork has begun, so this person also stops walking at coordinate 2.

The fourth and sixth persons encounter no roadworks while walking, so they walk forever. The output for these cases is -1.

Solution in Ruby (2.3.3) (judge verdict: Time Limit Exceeded)

class Heap
  def initialize
    @a = [nil]
    @h = {}
  end

  def swap(i, j)
    @a[i], @a[j] = @a[j], @a[i]
    @h[@a[i]], @h[@a[j]] = i, j
  end

  def up(i)
    p = i / 2
    return if i <= 1 || @a[p] <= @a[i]
    swap(i, p)
    up(p)
  end

  def down(i)
    c = i * 2
    a = @a.size
    return if c >= a
    c += 1 if c != a - 1 && @a[c] > @a[c + 1]
    return if @a[i] <= @a[c]
    swap(i, c)
    down(c)
  end

  def add(v)
    return if @h[v]
    @a << v
    i = @a.size - 1
    @h[v] = i
    up(i)
  end

  def delete(v)
    return unless i = @h[v]
    u = @a[-1]
    swap(i, -1)
    ret = @a.pop
    @h[ret] = nil
    v > u ? up(i) : down(i)
    ret
  end

  def first
    @a[1] || -1
  end
end

class Event
  TYPE_START = 0
  TYPE_END = 1
  TYPE_HUMAN = 2

  attr_reader :time, :type, :point

  def initialize(time, type, point)
    @time = time
    @type = type
    @point = point
  end

  def start?
    @type == TYPE_START
  end

  def end?
    @type == TYPE_END
  end

  def human?
    @type == TYPE_HUMAN
  end

  class << self
    def start(time, point)
      new(time, TYPE_START, point)
    end

    def end(time, point)
      new(time, TYPE_END, point)
    end

    def human(time)
      new(time, TYPE_HUMAN, 0)
    end
  end
end


def road_work(works, people)
  events = []

  works.each do |s, t, x|
    events << Event.start(s - x, x)
    events << Event.end(t - x, x)
  end

  people.each { |p| events << Event.human(p) }

  heap = Heap.new
  ans = []
  events.sort_by! { |e| e.time }.each do |event|
    heap.add(event.point) if event.start?
    heap.delete(event.point) if event.end?
    ans << heap.first if event.human?
  end

  ans
end

n, q = gets.split.map(&:to_i)
works = []
n.times { works << gets.split.map(&:to_i) }
people = []
q.times { people << gets.chomp.to_i }

puts road_work(works, people)