#P14676. [ICPC 2025 Seoul R] Mex Culpa

[ICPC 2025 Seoul R] Mex Culpa

题目背景

Due to variations in the performance of the evaluation system, an additional 2 seconds of time limit is provided for this problem.

题目描述

The mex (shorthand for minimum excluded value) of a sequence is the smallest non-negative integer that is not in the sequence. For example:

  • mex({})=0\text{mex}(\{\}) = 0
  • mex({1,2,3})=0\text{mex}(\{1,2,3\}) = 0
  • mex({5,0,1,1,4})=2\text{mex}(\{5,0,1,1,4\}) = 2
  • mex({0,5,2,1,5,0,1,2})=3\text{mex}(\{0,5,2,1,5,0,1,2\}) = 3

While the mex function has applications in combinatorial game theory, it is still a rather niche method for mapping a sequence to an integer. In the absence of a more organic problem, we have repurposed this concept to construct a task of a somewhat artificial nature. Sorry!

Write a program that, given two sequences of positive integers a=[a1,a2,,an]a = [a_1, a_2, \cdots, a_n] and b=[b1,b2,,bn]b = [b_1, b_2, \cdots, b_n], evaluates the following recurrence: for 1in1 \le i \le n,

$$f_i = \text{mex}(\{f_j \mid 1 \le j \le i-1; a_i \le a_j + b_j; a_j \le a_i + b_i\})$$

输入格式

Your program is to read from standard input. The first line contains a single integer, nn (1n250,0001 \le n \le 250,000), representing the length of the sequences. The second line contains nn positive integers a1,a2,,ana_1, a_2, \cdots, a_n (1ai1091 \le a_i \le 10^9) representing the sequence aa. The third line contains nn positive integers b1,b2,,bnb_1, b_2, \cdots, b_n (1bi1091 \le b_i \le 10^9), representing the sequence bb.

输出格式

Your program is to write to standard output. Print exactly one line consisting of nn space-separated integers, denoting f1,f2,,fnf_1, f_2, \cdots, f_n.

3
3 1 5
2 2 4
0 1 1
8
1 2 9 4 6 9 7 10
9 3 7 1 1 7 1 1
0 1 1 2 1 2 2 3
15
1 1 5 1 2 3 8 8 6 5 9 1 1 4 3
2 5 7 4 6 4 1 3 4 8 3 4 2 10 1
0 1 0 2 3 4 1 2 5 6 3 5 6 7 8