The Beginners’ Guide to Trie: How to Use the Trie in C++?

  • 时间：2020-09-23 15:50:46
  • 分类：网络文摘
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The Trie is common used data structure to speed up the word searching. The Trie is a structure to index the words character by character. trie-example Trie Definition in C++ Take a lowercase 26 letters for example, we can define a Trie nod... ...

How to Remove Vowels from a String in C++?

  • 时间：2020-09-23 15:50:46
  • 分类：网络文摘
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Given a string S, remove the vowels ‘a’, ‘e’, ‘i’, ‘o’, and ‘u’ from it, and return the new string. Example 1: Input: “leetcodeisacommunityforcoders” Output: “l... ...

Classic Unlimited Knapsack Problem Variant: Coin Change via Dyna

  • 时间：2020-09-23 15:50:46
  • 分类：网络文摘
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You are given coins of different denominations and a total amount of money. Write a function to compute the number of combinations that make up that amount. You may assume that you have infinite number of each kind of coin. Example 1: Inp... ...

Relative Sort Array Algorithm: Sort Array Based on Predefined Se

  • 时间：2020-09-23 15:50:46
  • 分类：网络文摘
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Given two arrays arr1 and arr2, the elements of arr2 are distinct, and all elements in arr2 are also in arr1. Sort the elements of arr1 such that the relative ordering of items in arr1 are the same as in arr2. Elements that don’t app... ...

How to Paint The Houses using Minimal Costs via Dynamic Programm

  • 时间：2020-09-23 15:50:46
  • 分类：网络文摘
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There are a row of n houses, each house can be painted with one of the three colors: red, blue or green. The cost of painting each house with a certain color is different. You have to paint all the houses such that no two adjacent houses h... ...

Compute the Number of Ways to Paint the House via Dynamic Progra

  • 时间：2020-09-23 15:50:46
  • 分类：网络文摘
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There is a fence with n posts, each post can be painted with one of the k colors. You have to paint all the posts such that no more than two adjacent fence posts have the same color. Return the total number of ways you can paint the fence.... ...

The MySQL If and Case Statement Exercise: How to Swap Elements i

  • 时间：2020-09-23 15:50:46
  • 分类：网络文摘
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Given a table salary, such as the one below, that has m=male and f=female values. Swap all f and m values (i.e., change all f values to m and vice versa) with a single update statement and no intermediate temp table. Note that you must wri... ...

How to Design a Two-Sum Data Structure?

  • 时间：2020-09-23 15:50:46
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Design and implement a TwoSum class. It should support the following operations: add and find. add – Add the number to an internal data structure. find – Find if there exists any pair of numbers which sum is equal to the value... ...

How to Design a Snake Game?

  • 时间：2020-09-23 15:50:46
  • 分类：网络文摘
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Design a Snake game that is played on a device with screen size = width x height. Play the game online if you are not familiar with the game. The snake is initially positioned at the top left corner (0,0) with length = 1 unit. You are give... ...

The Maximum Average Subtree of a Binary Tree

  • 时间：2020-09-23 15:50:46
  • 分类：网络文摘
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Given the root of a binary tree, find the maximum average value of any subtree of that tree. (A subtree of a tree is any node of that tree plus all its descendants. The average value of a tree is the sum of its values, divided by the numbe... ...