Leetcode 201. Bitwise AND of Numbers Range Bitwise AND of Numbers Range 题目大意:给定n,m两个数,要求你对n到m这个区间的所有数做且运算,问最后的结果是多少(不得不说,最近这些天的每日打卡题目质量都还挺好的) 题目思路:如果对区间所有数进行且运算,显然不合理,我们考虑这样一种情况,因为是做...
代码1 1publicintrangeBitwiseAnd(intm,intn) {2if(n ==m)3returnm;4inth = 0;5intl = 0;6intmm =m;7while(m > 0 || n > 0) {8if((m & 1) == (n & 1)) {9m >>= 1;10n >>= 1;11++h;12}13else{14m >>= 1;15n >>= 1;16l +=h;17++l;18h = 0;19}20}21if(h...
publicintrangeBitwiseAnd(intm,intn){//m 要赋值给 i,所以提前判断一下if(m==Integer.MAX_VALUE){returnm;}intres=m;for(inti=m+1;i<=n;i++){res&=i;if(res==0||i==Integer.MAX_VALUE){break;}}returnres;} 上边的解法就是我能想到的了,然后就去逛Discuss了,简直大开眼界。下边分享一下,主...
参考代码 packageleetcode// 解法一funcrangeBitwiseAnd1(mint,nint)int{ifm==0{return0}moved:=0form!=n{m>>=1n>>=1moved++}returnm<<uint32(moved)}// 解法二 Brian Kernighan's algorithmfuncrangeBitwiseAnd(mint,nint)int{forn>m{n&=(n-1)// 清除最低位的 1}returnn} 1. 2. 3. 4. 5. ...
leetcode---Bitwise AND of Numbers Range Given a range [m, n] where 0 <= m <= n <= 2147483647, return the bitwise AND of all numbers in this range, inclusive. For example, given the range [5, 7], you should return 4. 就是...
Given a range[m,n]where0<=m<=n<=2147483647,returnthe bitwise AND of all numbersinthisrange,inclusive. 样例 Input:[5,7]Output:4Input:[0,1]Output:0 1. 解题思路 这个题的意思非常的简单,就是要求计算[m, n]之间所有数字与远算的值。用常规方法可以很简单的写出来,但是意料之中就是超时...
201 Bitwise AND of Numbers Range The hardest part of this problem is to find the regular pattern. For example, for number26 to 30Their binary form are:1101011011111001110111110 Because we are trying to find bitwise AND, so if any bit there are at least one0and one1, it always0. In this...
classSolution {public:intrangeBitwiseAnd(intm,intn) {return(n > m) ? (rangeBitwiseAnd(m /2, n /2) <<1) : m; } }; 下面这种方法也不错,也很简单,如果m小于n就进行循环,n与上n-1,那么为什么要这样与呢,举个简单的例子呗,110与上(110-1),得到100,这不就相当于去掉最低位的1么,n就这...
Given a range [m, n] where 0 <= m <= n <= 2147483647, return the bitwise AND of all numbers in this range, inclusive. Example 1: Input: [5,7] Output: 4 Example 2: Input: [0,1] Output: 0 思路: 这题的考点是bit操作。 这题的思路可以借鉴二进制1的个数。 在《...
Bitwise AND of Numbers Range Given a range [m, n] where 0 <= m <= n <= 2147483647, return the bitwise AND of all numbers in this range, inclusive. For example, given the range [5, 7], you should return 4. 我们先从题目中给的例子来分析,[5, 7]里共有三个数字,分别写出它们的二...