International Morse Code defines a standard encoding where each letter i...

一.机器数和真值 1.机器码 在探讨三码是什么之前，先来了解一下机器码和真值是什么。一个数的二进制表示就是这个数的机器数，而一个数一般是带正负的...

Given a set of candidate numbers (candidates) (without duplicates) and a...

Roman numerals are represented by seven different symbols: I, V, X, L, C...

Roman numerals are represented by seven different symbols: I, V, X, L, C...

Implement strStr(). Return the index of the first occurrence of needle i...

Given a string, find the length of the longest substring without repeati...

Given a string s, find the longest palindromic substring in s. You may a...

The string "PAYPALISHIRING" is written in a zigzag pattern on a given nu...