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 Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.util.*;
import java.io.*;

class Main{
    static int n, q;
    static long[][] stx;
    static long[] d;
    public static void main(String[] args){
        FastScanner fsc=new FastScanner();
        n=fsc.nextInt(); q=fsc.nextInt();
        long[][] stx=new long[2*n][3];
        for(int i=0;i<n;i++){
            long s=fsc.nextLong(); long t=fsc.nextLong(); long x=fsc.nextLong();
            stx[i][0]=s-x; stx[i][1]=1; stx[i][2]=x;
            stx[i+n][0]=t-x; stx[i+n][1]=-1; stx[i+n][2]=x;
        }
        Arrays.sort(stx,(u,v)->u[0]>v[0]?1:u[0]<v[0]?-1:u[1]>v[1]?1:u[1]<v[1]?-1:0);
        d=new long[q];
        for(int j=0;j<q;j++) d[j]=fsc.nextLong();
        fsc.close();
        TreeSet<Long> set=new TreeSet<>();
        long[] dist=new long[q];
        for(int j=0;j<q;j++) dist[j]=-1;
        int index=0;
        for(int i=0;i<2*n;i++){
            if(stx[i][1]>0) set.add(stx[i][2]);
            else set.remove(stx[i][2]);

            while(stx[i][0]<=d[index] && (i==2*n-1 || d[index]<stx[i+1][0])){
                if(set.size()>0) dist[index]=set.first();
                index++;
                if(index>=q) break;
            }
            if(index>=q) break;
        }
        StringBuilder sb=new StringBuilder();
        for(long l:dist) sb.append(l+"\n");
        System.out.print(sb);
    }
    public static int bs(long key, boolean b){
        int left=-1;
        int right=q;
        while(right-left>1){
            int mid=left+(right-left)/2;
            if(d[mid]<key) left=mid;
            else right=mid;
        }
        return b?right:left;
    }
    public static int bsl(ArrayList<Integer> lst, int key){
        int left=-1;
        int right=lst.size();
        while(right-left>1){
            int mid=left+(right-left)/2;
            if(lst.get(mid)<key) left=mid;
            else right=mid;
        }
        return right;
    }
    public static int bsu(ArrayList<Integer> lst, int key){
        int left=-1;
        int right=lst.size();
        while(right-left>1){
            int mid=left+(right-left)/2;
            if(lst.get(mid)<=key) left=mid;
            else right=mid;
        }
        return left;
    }
    static class FastScanner {
        private final InputStream in = System.in;
        private final byte[] buffer = new byte[1024];
        private int ptr = 0;
        private int buflen = 0;
        private boolean hasNextByte(){
            if(ptr<buflen) return true;
            else{
                ptr = 0;
                try{
                    buflen = in.read(buffer);
                }
                catch(IOException e){
                    e.printStackTrace();
                }
                if(buflen<=0) return false;
            }
        return true;
        }
        private int readByte() { if (hasNextByte()) return buffer[ptr++]; else return -1;}
        private static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}
        public boolean hasNext() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++; return hasNextByte();}
        public String next() {
            if (!hasNext()) throw new NoSuchElementException();
            StringBuilder sb = new StringBuilder();
            int b = readByte();
            while(isPrintableChar(b)) {
                sb.appendCodePoint(b);
                b = readByte();
            }
            return sb.toString();
        }
        public long nextLong() {
            if (!hasNext()) throw new NoSuchElementException();
            long n = 0;
            boolean minus = false;
            int b = readByte();
            if (b == '-') {
                minus = true;
                b = readByte();
            }
            if (b < '0' || '9' < b) throw new NumberFormatException();
            while(true){
                if ('0' <= b && b <= '9') {
                    n *= 10;
                    n += b - '0';
                }
                else if(b == -1 || !isPrintableChar(b)) return minus ? -n : n;
                else throw new NumberFormatException();
                b = readByte();
            }
        }
        public int nextInt() {
            long nl = nextLong();
            if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();
            return (int) nl;
        }
        public double nextDouble() { return Double.parseDouble(next());}
        public void close(){
            try{in.close();}
            catch(IOException e){e.printStackTrace();}
        }
    }
}