During Upsolving, I have seen that some problems can be solved using the prefix sum method way more easily and efficiently. Which topic is new for me. So, I tried practicing it from cses problemset but it has o
Anyway, I discovered a nice way to solve static range query problems using "Divide and conquer", and I'm eager to share it with you guys. Pre-requisites: • Prefix Sum. Problem 1: Given an array AA of N(N≤105)N(N≤105) integers, your task is to answer q(q≤105)q(q≤...
codeforces 1485F — Copy or Prefix Sum 这道题虽然不太难,但竟然丧心病狂地卡unordered_map!!这真不是人干的事儿啊QAQAQ 我被卡了两次,除了第31个点,其它的基本上100ms以内就过去了,只有最后的#31是2000msTLE。试着把unordered_map换成map,交上去几乎是一眨眼就通过了,把我吓了一跳... 可能由于编译器...
Codeforces1485F - Copy or Prefix Sum 题目链接 参考题解链接 思路 最基本的dpdp状态转移方程都能推。 dp[i][j]:dp[i][j]:到第ii个数,前缀和为jj的所有方案数。 考虑第aiai的两种选择方式: 1、当ai=biai=bi时,前缀和为jj时: dp[i][j]=dp[i−1][j−bi](−inf≤j≤inf)dp[i][j]=...
【CodeForces - 1150C】Prefix Sum Primes(思维) 题干: We're giving away nice huge bags containing number tiles! A bag we want to present to you contains nn tiles. Each of them has a single number written on it — either 11or 22....
There are problems where proving is hard, i have also guessed solutions to some problems, 2 examples you gave are quite easy (1923C and the slimes problems). The only thing you needed further in 1923C is just make any 1 (no 1s is a trivial case) large enough to make the sum remain...
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1905A-ConstructiveProblems.cpp Create 1905A-ConstructiveProblems.cpp Dec 18, 2023 1905B-BeginnersZelda.cpp Create 1905B-BeginnersZelda.cpp Dec 18, 2023 1907A-Rook.cpp Create 1907A-Rook.cpp Dec 11, 2023 1907B-YetnotherrokenKeoard.cpp Create 1907B-YetnotherrokenKeoard.cpp Dec 12, 2023 ...
B: #PrefixSum 前缀和 https://www.bilibili.com/video/BV1df421X7gVC: 递归D: #BinarySearchGetMaxOrMin 二分查找 https://www.bilibili.com/video/BV1Vm41197VM#ModInt 取模大数 https://www.bilibili.com/video/BV194421F7naE:, 视频播放量 557、弹幕量 1、点赞数 30、投
Codeforces 895A (入门 prefix sum) ...Ehab and Prefix MEXs CodeForces - 1364C(思维) Given an array a of length n, find another array, b, of length n such that: for each i (1≤i≤n) MEX({b1, b2, …, bi})=ai. The MEX of a set of integers is the smallest non-negative ...