src/math/bits/bits.go:296 // --- Len ---// Len returns the minimum number of bits required to represent x; the result is 0 for x == 0.func Len(x uint) int { if UintSize == 32 { return Len32(uint32(x)) } return Len64(uint64(x))}// Len8 returns the min…

https://www.hackerrank.com/challenges/minimum-swaps-2/problem Minimum Swaps II You are given an unordered array consisting of consecutive integers  [1, 2, 3, ..., n] without any duplicates. You are allowed to swap any two elements. You need to find t…

5.5 Write a function to determine the number of bits required to convert integer A to integer B.EXAMPLEInput: 31,14Output: 2 这道题给了我们两个数字A和B,问如果将A转化为B需要变几个位,那么我们很容易想到要用异或来做,因为相同位异或为0,那么为1的为就是不相同的位,总和就是我们要求的结果.那么此题就转化为求异或结果中位‘1’的个数,我们可以用for循环来做,判断异或数的最…

题目如下: Given a m x n binary matrix mat. In one step, you can choose one cell and flip it and all the four neighbours of it if they exist (Flip is changing 1 to 0 and 0 to 1). A pair of cells are called neighboors if they share one edge. Return the min…

The Minimum Number of Variables 我们定义dp[ i ][ mask ]表示是否存在 处理完前 i 个a, b中存者 a存在的状态是mask 的情况. 然后用sosdp处理出,状态为state的a, 能组成的数字, 然后转移就好啦. #include<bits/stdc++.h> #define LL long long #define LD long double #define ull unsigned long long #define fi first #…

In an array A containing only 0s and 1s, a K-bit flip consists of choosing a (contiguous) subarray of length K and simultaneously changing every 0 in the subarray to 1, and every 1 in the subarray to 0. Return the minimum number of K-bit flips requir…

Given a value V, if we want to make change for V cents, and we have infinite supply of each of C = { C1, C2, .. , Cm} valued coins, what is the minimum number of coins to make the change? Examples: Input: coins[] = {25, 10, 5}, V = 30 Output: Minimum…

D. Minimum number of steps time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output We have a string of letters 'a' and 'b'. We want to perform some operations on it. On each step we choose one of s…

D. Minimum number of steps time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output We have a string of letters 'a' and 'b'. We want to perform some operations on it. On each step we choose one of s…

http://codeforces.com/contest/805/problem/D D. Minimum number of steps time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output We have a string of letters 'a' and 'b'. We want to perform some opera…