DISQUERY  Distance Query
English  Vietnamese 
The traffic network in a country consists of N cities (labeled with integers from 1 to N) and N1 roads connecting the cities. There is a unique path between each pair of different cities, and we know the exact length of each road.
Write a program that will, for each of the K given pairs of cities, find the length of the shortest and the length of the longest road on the path between the two cities.
Input
The first line of input contains an integer N, 2 ≤ N ≤ 100 000. Each of the following N1 lines contains three integers A, B and C meaning that there is a road of length C between city A and city B.
The length of each road will be a positive integer less than or equal to 1 000 000.
The next line contains an integer K, 1 ≤ K ≤ 100 000. Each of the following K lines contains two different integers D and E – the labels of the two cities constituting one query.
Output
Each of the K lines of output should contain two integers – the lengths from the task description for the corresponding pair of the cities.
Sample
input: 5 2 3 100 4 3 200 1 5 150 1 3 50 3 2 4 3 5 1 2 output: 100 200 50 150 50 100 input: 7 3 6 4 1 7 1 1 3 2 1 2 6 2 5 4 2 4 4 5 6 4 7 6 1 2 1 3 3 5 output: 2 6 1 4 6 6 2 2 2 6
hide comments
sarwar__05:
20180924 22:49:54
[100002][17] ==> AC in 0.70


vaibhav2303:
20180611 13:54:20
Simple sparse table(without binary search) and LCA concept gives AC. 

skych:
20171103 15:29:30
Sparse table + fast I/O without any optimization or changing the diameter of the sparse table still get AC (1.00s)


Rezaul H Sagar:
20170927 18:00:53
HLD + fast i/o gives TLE here! 

aspro:
20170626 15:32:45
very good question...also solve 609E(codeforces) Last edit: 20170626 15:33:45 

udit_003:
20170410 22:53:30
AC in one go!! good problem must try Last edit: 20170410 22:54:24 

hamzaziadeh:
20160918 23:24:08
So ez! AC in 1 go, good problem for noobs.. 

shas19:
20160716 01:08:01
worked with HLD (even though it is an overkill) 

Luis Manuel Díaz Barón:
20150423 17:08:02
It's true [20][100005] => ACCEPTED, [20][100005] => TLE


Mohammadreza Osouli:
20141128 14:54:54
runtime error !!

Added by:  ~!(*(@*!@^& 
Date:  20090228 
Time limit:  1s 
Source limit:  50000B 
Memory limit:  1536MB 
Cluster:  Cube (Intel G860) 
Languages:  All except: ERL JSRHINO NODEJS PERL6 VB.NET 
Resource:  COI 06 