AtCoder ABC 319E 中国剩余定理

文章介绍了如何利用中国剩余定理和线性同余方程解决AtCoderABC319E问题中的公交车停靠站计算问题,通过预处理和模运算降低时间复杂度。
题意

传送门 AtCoder ABC 319E Bus Stops

题解

对于停车点间的每一段距离,仅跟抵达前驱车站模 P i P_i Pi 的模数相关。考虑中国剩余定理 x m o d    n ↔ ( x m o d    a , x m o d    b ) , n = a ⋅ b , g c d ( a , b ) = 1 x\mod n \leftrightarrow (x\mod a, x\mod b),n=a\cdot b,gcd(a,b)=1 xmodn(xmoda,xmodb),n=a

### AtCoder Contest ABC346 Problems and Information AtCoder Beginner Contest (ABC) 346 is a programming competition designed to challenge participants with various algorithmic problems. Each problem within the contest has specific constraints regarding time limits, memory usage, and expected outputs. For instance, one of the sample output formats provided shows how results should be structured when submitting solutions[^3]. The format typically includes multiple test cases where each case expects certain input parameters leading to predefined outcomes. In terms of difficulty levels, contests like these usually start from easier tasks labeled as A or B progressing towards more complex challenges marked by letters such as D or E. Participants are encouraged to solve all given questions but must adhere strictly to guidelines concerning code length restrictions not exceeding 16KB along with execution times capped at 1 second per task while ensuring that no more than 256MB RAM is utilized during processing phases. Regarding legal aspects related possibly indirectly through referencing court decisions on jurisdictional matters which might apply broadly across online platforms hosting coding competitions; however this particular citation does not directly pertain specifically here[^2]. #### Example Problem Description Consider an example problem statement similar in structure though not exact wording: Given a binary tree represented implicitly via array indices, determine whether it can be inverted so every left child becomes a right child and vice versa without altering node values themselves. This type of question would fall under graph theory concepts applied practically within competitive programming environments aimed primarily toward beginners yet still requiring solid understanding fundamental data structures including trees alongside bitwise operations potentially useful solving space-efficiently due limited resources specified earlier mentioned constraints[^1]. ```python def invert_tree(tree_arr): n = len(tree_arr) for i in range(n//2): opposite_index = ((i+1)*(-1))-1 if abs(opposite_index) <= n: temp = tree_arr[i] tree_arr[i] = tree_arr[opposite_index] tree_arr[opposite_index] = temp return tree_arr ```
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