Now, you can automatically find and add random problems for your mashup based on a range of criteria and restrictions. The problems are sourced from the archive, and unusual problems are automatically excluded. So, click the "Add random problems" link under the problem list and proceed to the...
My algorithm is slow: I repeat to generate random (withFisher-Yates shuffle) permutation and check each element if it not occur in previous sequences (I used 2D array). How to determine what is the complexity of my algorithm? How to solve problem faster? How many such permutations do you...
long long ans = 0; // create a 64-bit signed variable which is initially equal to 0for(int i = 1; i <= k; i++){ int idx = rnd.next(0, n - 1); // generate a random integer between 0 and n - 1, both inclusive // each integer from 0 to n - 1 has the same probabi...
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codeforces 478B Random Teams 解题报告 题目链接:http://codeforces.com/problemset/problem/478/B 题目意思:有 n 个人,需要将这班人分成 m 个组,每个组至少含有一个人,同一个组里的人两两可以结交成一个pair,问怎样分配,可以使得 pair 数最少和最多,输出之。
【codeforces 431D】Random Task 【题目链接】:http://codeforces.com/problemset/problem/431/D 【题意】 给你一个数字m和数字k; 让你找一个数字x; 使得x+1..2*x这个区间范围内的数,它们的二进制形式里面,1的个数恰好为k个的数字恰好有m个;
Random Teams 题意 将互不相识的 个人分为非空的 组,每组内的人两两成为朋友.问最后得到的朋友的对数的最小值和最大值. 思路 设第 组的人数为 ,则 . . ①对最小值,由Cauchy不等式: , 则 ,取等条件 . 虽上述不等式未…阅读全文 赞同 添加评论 分享收藏 [...
【codeforces 431D】Random Task 【题目链接】:http://codeforces.com/problemset/problem/431/D 【题意】 给你一个数字m和数字k; 让你找一个数字x; 使得x+1..2*x这个区间范围内的数,它们的二进制形式里面,1的个数恰好为k个的数字恰好有m个;
1461C. Random Events 题意(2\ \mathrm{s}) 给定一个1\sim n的排列a_1,\cdots,a_n.现有m个操作,每个操作记作(r,p),表示有p的概率将a[1...r]升序排列.依次做m个操作,求最后将序列升序排列的概率,误差不超过1\mathrm{e}-6. 有t\ \ (1\leq t\leq 100)组测试数据.每组测试数据第一行输入...
1174C-EhabAndASpecialColoringProblem.cpp 1175A-FromHeroToZero.cpp 1176A-DivideIt.cpp 1176B-MergeIt.cpp 1176C-LoseIt.cpp 1177A-DigitsSequenceEasyEdition.cpp 1177B-DigitsSequenceHardEdition.cpp 1178A-PrimeMinister.cpp 1178B-WOWFactor.cpp ...