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 C# (Mono 4.6.2.0) (judge verdict: Time Limit Exceeded)

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;

namespace ERoadwork
{
    class Program
    {
        static void Main(string[] args)
        {
            // 入力 N/Q の取得
            var inputNQ = Console.ReadLine().Split().Select(int.Parse).ToArray();
            var n = inputNQ[0];    // 道路工事の数
            var q = inputNQ[1];    // 調査対象の人数

            // 道路工事情報の取得
            var roadworks = new Roadwork[n];
            for (var i = 0; i < n; i++)
            {
                var inputSTX = Console.ReadLine().Split().Select(int.Parse).ToArray();
                var s = inputSTX[0];
                var t = inputSTX[1];
                var x = inputSTX[2];

                roadworks[i] = new Roadwork(s, t, x);
            }

            roadworks = roadworks.Where(r => r.IsReachable(0)).ToArray();

            // 道路工事の位置順に並び替え
            Array.Sort(roadworks, (a, b) => a.Position.CompareTo(b.Position));

            var needToThinOut = q >= 10000;
            var thinOutUnit = q / 10;

            var reachablePositions = new int[q];
            for (var i = 0; i < q; i++)
            {
                var departureTime = int.Parse(Console.ReadLine());
                Roadwork roadwork = null;
                foreach (var r in roadworks)
                {
                    if (!r.NeedToStop(departureTime)) continue;

                    roadwork = r;
                    break;
                }

                reachablePositions[i] = roadwork != null ? roadwork.Position : -1;

                if (needToThinOut && i % thinOutUnit == 0)
                {
                    roadworks = roadworks.Where(r => r.IsReachable(departureTime)).ToArray();
                }
            }

            // 解答の出力
            var sw = new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false };
            Console.SetOut(sw);
            for (var i = 0; i < q; i++)
            {
                Console.WriteLine(reachablePositions[i]);
            }
            Console.Out.Flush();
        }
    }

    class Roadwork
    {
        readonly int startTime, endTime;

        public int Position { get; }

        public Roadwork(int s, int t, int x)
        {
            startTime = s;
            endTime = t;
            Position = x;
        }

        // 調査対象が到着時刻に工事中か否か
        public bool NeedToStop(int departureTime)
        {
            var arrivalTime = departureTime + Position;
            return startTime <= arrivalTime && arrivalTime < endTime;
        }

        public bool IsReachable(int departureTime)
        {
            return departureTime + Position < endTime;
        }
    }
}