# Python Challenge - Maximize Stock Trading Profit

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def max_profit_days(stock_prices): max_profit_amt = 0 max_day_1 = 0 max_day_2 = 1 for day in stock_prices: i = stock_prices.index(day) while i < len(stock_prices): if stock_prices[i] - day > max_profit_amt and i != stock_prices.index(day): max_day_1 = stock_prices.index(day) max_day_2 = i max_profit_amt = stock_prices[i] - day i+=1 return max_day_1, max_day_2
def max_profit_days(stock_prices): # Write your code here: max_profit = None for i in range(len(stock_prices)): for j in range(i + 1, len(stock_prices)): profit = stock_prices[j] - stock_prices[i] if max_profit is None or profit > max_profit: max_profit = profit buy_day, sell_day = i, j return (buy_day, sell_day) print(max_profit_days([17, 11, 60, 25, 150, 75, 31, 120]))

def max_profit_days(stock_prices):

high = -999999
final = [0,0]

for i in range(len(stock_prices)):

``````for j in range(i + 1,len(stock_prices)):
if stock_prices[j] - stock_prices[i] >= high:
high = stock_prices[j] - stock_prices[i]
final = (i,j)
print(final)

else:
continue
``````

return final

print(max_profit_days([17, 11, 60, 25, 150, 75, 31, 120]))

I made a helper function to find the index of the maximum (only using the part of the list from a specified index forward),
and I used that in a loop to get the max possible profit for buying on any given day,
and then finding the maximum out of all of those.

my code
``````def index_of_max(arr, starting_index = 0, ending_index = None):
length = len(arr)
if length < 1:
return None
if ending_index is None:
ending_index = length - 1
else:
length = ending_index + 1
max_so_far = arr[starting_index]
max_index = starting_index
for i in range(starting_index, length):
if arr[i] > max_so_far:
max_so_far = arr[i]
max_index = i
return max_index

def max_profit_days(stock_prices):

length = len(stock_prices)
profits = []
sell_days = []

for i in range(length - 1):
# index i is the day that buy the stock
differences = [(x - stock_prices[i]) for x in stock_prices]
best_day = index_of_max(differences, starting_index = i + 1)
profit = differences[best_day]
profits.append(profit)
sell_days.append(best_day)
#print((i, best_day), profit)

selected_index = index_of_max(profits)
return (selected_index, sell_days[selected_index])
``````

def max_profit_days(days):
highest_profit=None
b_day=None
s_day=None
days=list(days)
length=len(days)