Sum square difference
Problem 6
The sum of the squares of the first ten natural numbers is,
12 + 22 + ... + 102 = 385
The square of the sum of the first ten natural numbers is,
(1 + 2 + ....
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其他好文 时间：
2014-05-23 02:22:57
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193
Problem 1: Multiples of 3 and 5
If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.
Find the sum of all the multip...
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其他好文 时间：
2014-05-23 01:43:01
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253
Jimmy writes down the decimal representations of all natural numbers between and including m and n, (m ≤ n). How many zeroes will he write down?
Input
Input starts with an integer T (≤ 11000), denot...
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其他好文 时间：
2014-05-22 22:59:18
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354
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Terrible Sets
Time Limit: 1000MS
Memory Limit: 30000K
Total Submissions: 2999
Accepted: 1549
Description
Let N be the set of all natural numbers {0 , 1 , 2 , . . . ...
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其他好文 时间：
2014-05-22 09:52:10
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283
1729 is the natural number following 1728 and preceding 1730. It is also known as the Hardy-Ramanujan number after a famous anecdote of the British mathematician G. H. Hardy regarding
a hospital vis...
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其他好文 时间：
2014-05-13 14:52:34
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314
Prime Ring Problem
Problem Description
A ring is compose of n circles as shown in diagram. Put natural number 1, 2, ..., n into each circle separately, and the sum of numbers in two adjacent...
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其他好文 时间：
2014-05-13 11:54:17
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444
自然连接:自然连接是在两张表中寻找那些数据类型和列名都相同的字段，然后自动地将他们连接起来，并返回所有符合条件按的结果。来看一下自然连接的例子。Select
emp.ename,dept.dnameFrom emp natural join dept;这里我们并没有指定连接的条件，实际上oracle...
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其他好文 时间：
2014-05-10 00:37:54
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702
我的那个暴力求解，太耗时间了。用了网上产的什么因式分解，质因数之类的。确实快！还是数学基础不行，只能知道大约。The
sequence of triangle numbers is generated by adding the natural numbers. So the
7th triangl...
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其他好文 时间：
2014-05-09 23:43:16
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342
With the shortage of natural sand resources
increasingly tense, artificial sand began to increasingly replace natural sand
for the construction of the...
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其他好文 时间：
2014-05-09 12:57:36
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272
这个比较简单，慢慢进入状态。A Pythagorean triplet is a set of
three natural numbers, a b c, for which,a2 + b2 = c2For example, 32 + 42 = 9 +
16 = 25 = 52.There ex.....
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其他好文 时间：
2014-05-09 10:35:46
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266
