These are N cities in Spring country. Between each pair of cities there may be one transportation track or none. Now there is some cargo that should be delivered from one city to another. The transportation fee consists of two parts: The cost of the tran
There are N piles of stones arranged in a row. The i-th pile has stones[i] stones. A move consists of merging exactly K consecutive piles into one pile, and the cost of this move is equal to the total number of stones in these K piles. Find the
目录 题目描述： 示例 : 解法： 题目描述： 给定一个所有节点为非负值的二叉搜索树，求树中任意两节点的差的绝对值的最小值。 示例 : 输入: 1 \ 3 / 2 输出: 1 解释: 最小绝对差为1，其中 2 和 1 的差的绝对值为 1（或者 2 和 3）。 注意:
Levenshtein Distance The Levenshtein distance is a string metric for measuring the difference between two sequences. Informally, the Levenshtein distance between two words is the minimum number of single-character edits (insertions, deletions or substitut
We have two integer sequences A and B of the same non-zero length. We are allowed to swap elements A[i] and B[i]. Note that both elements are in the same index position in their respective sequences. At the end of some number of swaps, A and B are
题目 这不线段树合并板子题吗 #include<algorithm> #include<iostream> #include<cstring> #include<cstdio> #define LL long long #define re register #define maxn 100005 #define inf 9999999999 inline int read() { char c=getchar();int x=0;while(c&l
There are N piles of stones arranged in a row. The i-th pile has stones[i] stones. A move consists of merging exactly K consecutive piles into one pile, and the cost of this move is equal to the total number of stones in these K piles. Find th
【agc030f】Permutation and Minimum（动态规划） 题面 atcoder 给定一个长度为\(2n\)的残缺的排列\(A\)，定义\(b_i=min\{A_{2i-1},A_{2i}\}\)，求有多少种不同的\(b\)。 题解 考虑这个\(b\)的取值是两两配对之后求\(min\)，所以我们把所有的数按照从大往小处理，这样子就可以在每一对数填好的
Hello everyone! I am your old friend Rikka. Welcome to Xuzhou. This is the first problem, which is a problem about the minimum spanning tree (MST). I promise you all that this should be the \textbf{easiest problem}easiest problem for most people. A minim
题目来源：leetcode 题目描述： Given an array of n positive integers and a positive integer s, find the minimal length of a contiguous subarray of which the sum ≥ s. If there isn't one, return 0 instead. Example: Input: s = 7, nums = [2,3,1,2,4,3]Output: 2Ex
我永远都学不会贪心算法罢了(╯‵□′)╯︵┻━┻ class Solution {public: int minKBitFlips(vector<int>& A, int K) { int count=0, A_length=A.size(); queue<int> flip_records; bool has_flipped, need_flip; for (int i=0;i<A_length;i
Piggy-Bank Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 37378 Accepted Submission(s): 18528 Problem Description Before ACM can do anything, a budget must be prepared and the necessary finan
Given a string S and a string T, find the minimum window in S which will contain all the characters in T in complexity O(n). Example: Input: S = "ADOBECODEBANC", T = "ABC" Output: "BANC" Note: If there is no such window in
题目如下： In a country popular for train travel, you have planned some train travelling one year in advance. The days of the year that you will travel is given as an array days. Each day is an integer from 1 to 365. Train tickets are sold in 3 differe
算法描述： Given a triangle, find the minimum path sum from top to bottom. Each step you may move to adjacent numbers on the row below. For example, given the following triangle [ [2], [3,4], [6,5,7], [4,1,8,3] ] The minimum path sum from top to
In a country popular for train travel, you have planned some train travelling one year in advance. The days of the year that you will travel is given as an array days. Each day is an integer from 1 to 365. Train tickets are sold in 3 different ways:
之前做的时候没想出来...现在来数学推导一波。 题意：从n个木棒中选出4个拼成一个矩形，使得 (周长)2/面积 最小。 解：设矩形宽a长b。我们要最小化下面这个式子： 去掉常数，不妨设b = a + len，则化为下式： 取倒数，也就是最大化下式: 显然对于每个确定的a，len越小越好。所以直接取相邻的即可
题目:Minimum Inversion Number 链接:http://acm.hdu.edu.cn/showproblem.php?pid=1394 分析: 1）先对序列求逆序对的数目，归并排序，线段树，树状数组都可以。 2）考虑到这是一个[0,n)的排列，全体加一，变成一个[1,n]的排列。 3）把第一个数移动到最后一位对答案的贡献是(n-a[1])-(a[1]-1)。在第
Given a square array of integers A, we want the minimum sum of a falling path through A. A falling path starts at any element in the first row, and chooses one element from each row. The next row's choice must be in a column that is different from t
