mu chance or much chance ?

日々の戯れ言

Gstreamer

仕事でGstreamerを使う必要になり,インストールしました.

osx(macbook)での映像出力の話です.

  • homebrewを使ってGstreamerをインストール
brew install gstreamer gst-plugins-base gst-plugins-good gst-plugins-bad gst-plugins-ugly gst-libav
  • Gstreamerを起動
gst-launch-1.0 autovideosrc ! osxvideosink

とすれば,

macbook内蔵のカメラの映像が出力されます.

Project Euler 5

  • 問題

Problem 5:Smallest multiple
2520 is the smallest number that can be divided by each of the numbers from 1 to 10 without any remainder.
What is the smallest positive number that is evenly divisible by all of the numbers from 1 to 20?

  • 解答例
def gcd(m, n):
    while n:
        m, n = n, m % n
    return m

def lcm(m, n):
    return (m * n) // gcd(m, n)

mul = 1
for x in range(1, 21):
    mul = lcm(mul, x)

print(mul)

Project Euler 4

  • 問題

Problem 4: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 = 91 × 99.
Find the largest palindrome made from the product of two 3-digit numbers.

  • 解答例
def isPalindromeNum(num):
    numStr = str(num)
    if numStr == numStr[::-1]:
        return 1
    return 0

max = 0
for i in range(100, 1000):
    for j in range(100, 1000):
        if(isPalindromeNum(i * j) and max < i * j):
            max = i * j

print(max)