Idols and Fans
All submissions for this problem are available.
Read problems statements in Mandarin Chinese and Russian as well.
Mike is a cool kid, so he's the most popular person in his school. All the girls want to be with him while all the boys want to be like him.
There are N persons in Mike's school. No person in the school has a name(except Mike), but all of them have a unique ID integer number for the range[1..N]. Mike's ID equals to 1. Also, each person(except Mike) has his/her personal idol, who is another person from the school. Finally, each person X has an integer number AX.
Let's define functions F and G for a person with ID equals to X:
- If X = 1(which means that person X is Mike), then FX = AX and GX = 1;
- Otherwise, let Y be the personal idol for X.
- If FY + 1 < AX, then FX = AX and GX = 1;
- If FY + 1 > AX, then FX = FY + 1 and GX = GY;
- If FY + 1 = AX, then FX = FY + 1 and GX = GY + 1.
It's guaranteed, that it's possible to calculate functions F and G for every person in the school.
You are to write a program, that can efficiently process queries of the following types:
- 0 X NEW_VALUE - change the value of AX to NEW_VALUE;
- 1 X - calculate FX and GX.
The first line of the input contains two integers N and Q, denoting the number of the persons in Mike's school and the number of queries to process.
The second line contains N integers Ai, denoting A1, A2, ..., AN.
The third line contains N - 1 integers Pi, denoting the personal idols of persons with IDs equal to 2, 3, ..., N. 1 ≤ Pi < i.
The next Q lines contain information about the queries. The format of the queries is the same with the one described in the statement.
For each query of the second type, output a single line containing two integers, FX and GX.
1 ≤ N ≤ 100000;
1 ≤ Q ≤ 300000;
1 ≤ Ai ≤ 109, for each person;
1 ≤ X ≤ N, 1 ≤ NEW_VALUE ≤ 109, for each query of the first type.
Input: 5 2 1 2 3 4 5 1 2 3 4 1 5 0 1 100 Output: 5 5
In the input, before the second query, F's and G's equals to the following:
After the second query, F's and G's equals to the following:
|Tags||cook47, hard, heavy-light, kostya_by, segment-tree|
|Time Limit:||2 sec|
|Source Limit:||50000 Bytes|
|Languages:||C, CPP14, JAVA, PYTH, PYTH 3.6, CS2, PAS fpc, PAS gpc, RUBY, PHP, GO, NODEJS, HASK, SCALA, D, PERL, FORT, WSPC, ADA, CAML, ICK, BF, ASM, CLPS, PRLG, ICON, SCM qobi, PIKE, ST, NICE, LUA, BASH, NEM, LISP sbcl, LISP clisp, SCM guile, JS, ERL, TCL, PERL6, TEXT, PYP3, CLOJ, FS|
Fetching successful submissions
If you are still having problems, see a sample solution here.