unit two 词汇 infant,toddler 阶段 difficult stage 可以换成 difficult period period 只指一段时间 区间的意思，stage则为发展历程的某一个阶段 childhood parenthood throw a tantrum 发脾气 愤怒从 ...
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其他好文 时间：
2020-02-20 13:39:21
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121
1. Bertrand Triangle r=1; %circle radius x0=0; y0=0; %centre of circle %points for circle t=linspace(0,2*pi,200); xp=r*cos(t); yp=r*sin(t); %angles of ...
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2020-02-20 10:21:47
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Description Roman numerals are represented by seven different symbols: I, V, X, L, C, D and M. For example, two is written as II in Roman numeral, jus ...
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2020-02-20 09:28:12
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79
In a given 2D binary array , there are two islands. (An island is a 4 directionally connected group of s not connected to any other 1s.) Now, we may c ...
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2020-02-19 23:40:26
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Given two strings a and b we define a*b to be their concatenation. For example, if a = "abc" and b = "def" then a*b = "abcdef". If we think of concate ...
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编程语言 时间：
2020-02-18 16:33:41
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88
two pointers通向扫描法。 #include<iostream> #include<algorithm> using namespace std; typedef long long LL; LL a[100010] = {0}; int main() { int n,p,max = -1 ...
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2020-02-18 13:04:59
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Polycarpus has a ribbon, its length is n. He wants to cut the ribbon in a way that fulfils the following two conditions: After the cutting each ribbon ...
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2020-02-18 13:04:42
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Given a binary tree, check whether it is a mirror of itself (ie, symmetric around its center). For example, this binary tree [1,2,2,3,4,4,3] is symmet ...
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2020-02-17 23:52:41
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90
Summation of primes The sum of the primes below 10 is 2 + 3 + 5 + 7 = 17. Find the sum of all the primes below two million. 素数的和 所有小于10的素数的和是2 + 3 + 5 ...
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2020-02-17 20:02:02
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77
Largest palindrome product A palindromic number reads the same both ways. The largest palindrome made from the product of two 2 digit numbers is 9009 ...
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其他好文 时间：
2020-02-17 18:15:39
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102
