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: Wrong Answer)

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

public class Hello
{
    private const int MOD_N = 1000000000 + 7;

    public static void Main()
    {
        var list = Console.ReadLine().Split(' ');
        var n = int.Parse(list[0]);
        var q = int.Parse(list[1]);

        var stxs = new KeyValuePair<int, KeyValuePair<int, int>>[n];
        for (int i = 0; i < stxs.Length; ++i)
        {
            var list2 = Console.ReadLine().Split(' ');
            var s = int.Parse(list2[0]);
            var t = int.Parse(list2[1]);
            var x = int.Parse(list2[2]);
            stxs[i] = new KeyValuePair<int, KeyValuePair<int, int>>(s, new KeyValuePair<int, int>(t, x));
        }

        var ds = new int[q];
        for (int i = 0; i < ds.Length; ++i)
            ds[i] = int.Parse(Console.ReadLine());

        var events = new KeyValuePair<int, KeyValuePair<int, int>>[2 * n + q];

        for (int i = 0; i < stxs.Length; ++i)
        {
            var stx = stxs[i];
            var s = stx.Key;
            var tx = stx.Value;
            var t = tx.Key;
            var x = tx.Value;
            events[i * 2 + 0] = new KeyValuePair<int, KeyValuePair<int, int>>(s - x, new KeyValuePair<int, int>(1, x));
            events[i * 2 + 1] = new KeyValuePair<int, KeyValuePair<int, int>>(t - x, new KeyValuePair<int, int>(2, x));
        }

        for (int i = 0; i < ds.Length; ++i)
            events[n * 2 + i] = new KeyValuePair<int, KeyValuePair<int, int>>(ds[i], new KeyValuePair<int, int>(3, i));

        Array.Sort(
            events,
            (l ,r) =>
            {
                var comp = l.Key.CompareTo(r.Key);
                return comp != 0 ? comp : l.Value.Key.CompareTo(r.Value.Key);
            }
        );

        var xs = new HashSet<int>();
        var anss = new int[q];

        for (int i = 0; i < events.Length; ++i)
        {
            var param = events[i].Value;
            switch (param.Key)
            {
                case 1:
                    xs.Add(param.Value);
                    break;
                case 2:
                    xs.Remove(param.Value);
                    break;
                case 3:
                    var min = int.MaxValue;
                    foreach (var x in xs)
                    {
                        if (x < min)
                            min = x;
                    }
                    anss[param.Value] = min != int.MaxValue ? min : -1;
                    break;
            }
        }

        for (int i = 0; i < anss.Length; ++i)
            Console.WriteLine(anss[i]);
    }

    private static int Comb(int m, int n)
    {
        var t = m - n;
        if (n > t)
            n = t;

        long numerator = 1;
        for (int i = 0; i < n; ++i)
        {
            numerator *= m - i;
            numerator %= MOD_N;
        }
        long denominator = 1;
        for (; n != 0; --n)
        {
            denominator *= n;
            denominator %= MOD_N;
        }

        var inv_denominator = ModInv((int)denominator, MOD_N);
        var ret = (int)(numerator * inv_denominator % MOD_N);

        return ret >= 0 ? ret : ret + MOD_N;
    }

    private static int ModInv(int a, int m)
    {
        int b = m, x = 1, y = 0;
        while (b != 0)
        {
            var t = a / b;
            a -= t * b;
            Swap(ref a, ref b);
            x -= t * y;
            Swap(ref x, ref y);
        }
        x %= m;
        return x >= 0 ? x : x + m;
    }

    private static void Swap<T>(ref T a, ref T b)
    {
        var t = a;
        a = b;
        b = t;
    }
}