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@shogonir shogonir/exam1.py
Created Jul 8, 2015

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I tried "Five programming problems every Software Engineer should be able to solve in less than 1 hour" in Python.
#! /usr/bin/env python
# -*- coding:utf-8 -*-
num_list = range(10)
# use for roop
list_sum = 0
for num in num_list :
list_sum += num
print 'list_sum counted with for roop :', list_sum
# use while roop
list_sum, i = 0, 0
while i < len(num_list) :
list_sum += num_list[i]
i += 1
print 'list_sum counted with while roop :', list_sum
# use recursive function
def count_sum (num_list, i=0) :
if i == len(num_list) - 1 :
return num_list[i]
else :
return num_list[i] + count_sum(num_list, i+1)
print 'list_sum counted with recursive function :', count_sum(num_list)
#! /usr/bin/env python
# -*- coding:utf-8 -*-
def combine_alternately (list1, list2) :
new_list = []
for e1, e2 in zip(list1, list2) :
new_list += [e1, e2]
return new_list
def combine_alternately2 (list1, list2) :
new_list = []
i, j = 0, 0
while i < len(list1) or j < len(list2) :
if i < len(list1) :
new_list.append(list1[i])
if j < len(list2) :
new_list.append(list2[j])
i += 1
j += 1
return new_list
if __name__ == '__main__' :
list1, list2 = ['1', '2', '3', '4'], ['a', 'b', 'c']
print combine_alternately(list1, list2)
print combine_alternately2(list1, list2)
#! /usr/bin/env python
# -*- coding:utf-8 -*-
def fibonacci_series (size=100) :
fibos = [0, 1]
while len(fibos) < size :
fibos.append(fibos[-1] + fibos[-2])
return fibos
print fibonacci_series(size=100)
#! /usr/bin/env python
# -*- coding:utf-8 -*-
import itertools
def max_num_combination (num_list) :
max_num = 0
for a_list in itertools.permutations(num_list, len(num_list)) :
num = int(''.join(map(str, a_list)))
if max_num < num :
max_num = num
return max_num
num_list = [50, 2, 1, 9]
print max_num_combination(num_list)
#! /usr/bin/env python
# -*- coding:utf-8 -*-
import itertools
from exam_2 import combine_alternately2
operations = ['+', '-', '']
for string in itertools.product(operations, repeat=8) :
num_list = ['{0}'.format(i+1) for i in range(9)]
formula = ''.join(combine_alternately2(num_list, string))
if eval(formula) == 100 :
print formula, '=', eval(formula)
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