Given a non-negative integer num represented as a string, remove k digits from the number so that the new number is the smallest possible. Note: The length of num is less than 10002 and will be ≥ k. The given num does not contain any leading zero. Ex…

Given a non-negative integer num represented as a string, remove k digits from the number so that the new number is the smallest possible. Note: The length of num is less than 10002 and will be ≥ k. The given num does not contain any leading zero. Ex…

/** 题目:E - Leading and Trailing 链接:https://vjudge.net/contest/154246#problem/E 题意:求n^k得前三位数字以及后三位数字,保证一定至少存在六位. 思路:后三位求法只要不断对1000取余就行了. 前三位求法: 对一个数x,他可以用科学计数法表示为10^r*a (r为次方,1<=a<10) 设:n^k = x = 10^r*a 两边取对数: k*log10(n) = log10(x) = r+log10(a); 令y =…

402. Remove K Digits https://www.cnblogs.com/grandyang/p/5883736.html https://blog.csdn.net/fuxuemingzhu/article/details/81034522 https://blog.csdn.net/qq508618087/article/details/52584133 题目的要求是删除k个字符,在保证原字符串字符相对位置不变的情况下获得最小的数字. 一个贪心的思想,维护一个单调递增的栈.只…

Given a non-negative integer num represented as a string, remove k digits from the number so that the new number is the smallest possible. Note: The length of num is less than 10002 and will be ≥ k. The given num does not contain any leading zero. Ex…

Medium! 题目描述: 给出集合 [1,2,3,…,n],其所有元素共有 n! 种排列. 按大小顺序列出所有排列情况,并一一标记,当 n = 3 时, 所有排列如下: "123" "132" "213" "231" "312" "321" 给定 n 和 k,返回第 k 个排列. 说明: 给定 n 的范围是 [1, 9]. 给定 k 的范围是[1,  n!]. 示例 1: 输入: n…

[LeetCode]402. Remove K Digits 解题报告(Python) 标签(空格分隔): LeetCode 作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 题目地址:https://leetcode.com/problems/remove-k-digits/description/ 题目描述: Given a non-negative integer num represented as a string, rem…

给定一个以字符串表示的非负整数 num,移除这个数中的 k 位数字,使得剩下的数字最小.注意:    num 的长度小于 10002 且 ≥ k.    num 不会包含任何前导零.示例 1 :输入: num = "1432219", k = 3输出: "1219"解释: 移除掉三个数字 4, 3, 和 2 形成一个新的最小的数字 1219.示例 2 :输入: num = "10200", k = 1输出: "200"解释:…

(English version is after the code part) 这个题做起来比看起来容易,然后我也没仔细想,先速度刷完,以后再看有没有改进. 用这个来说: 1 2 4 3 2 2 1 9 去掉1位的话,应该去掉4,得到 1 2 3 2 2 1 9 去掉2位的话,在刚才的基础上,去掉3,得到1 2 2 2 1 9. 显而易见,每次找第一个最大值.上面的例子,第一次找到的是4,第二次是3,下一个数开始变小就不找了,所以找不到最后的9. 然后就各种特殊情况. 首先例子已经给了一个提示…

Given a non-negative integer num represented as a string, remove k digits from the number so that the new number is the smallest possible. Note: The length of num is less than 10002 and will be ≥ k. The given num does not contain any leading zero. Ex…