Sum square difference

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简单：

e sum of the squares of the first ten natural numbers is,

The square of the sum of the first ten natural numbers is,

Hence the difference between the sum of the squares of the first ten natural numbers and the square of the sum is 3025 385 = 2640.

Find the difference between the sum of the squares of the first one hundred natural numbers and the square of the sum.

def naturalnumber(n):
    sumnatural = 0
    for i in xrange(1,n+1):
        sumnatural += i * i
    return sumnatural

def squarenumber(n):
    sumsquare = 0
    for i in xrange(1,n+1):
        sumsquare += i
    return sumsquare * sumsquare

print squarenumber(100) - naturalnumber(100)

C:\webpy\webpy\Scripts\python.exe C:/pycode/euler.py
25164150

Process finished with exit code 0

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Sum square difference

标签：style   blog   class   code   java   ext   

原文地址：http://www.cnblogs.com/aguncn/p/3713742.html