HackerRank Sam and substrings

提出

11/13 test cases failed :(

code: python

import math

import os

import random

import re

import sys

#

# Complete the 'substrings' function below.

#

# The function is expected to return an INTEGER.

# The function accepts STRING n as parameter.

#

def substrings(n):

# Write your code here

ans = 0

for i in range(1, len(n)+1):

for j in range(len(n)+1 - i):

return ans

if __name__ == '__main__':

n = input()

result = substrings(n)

fptr.write(str(result) + '\n')

fptr.close()

解答

code: python

import math

import os

import random

import re

import sys

#

# Complete the 'substrings' function below.

#

# The function is expected to return an INTEGER.

# The function accepts STRING n as parameter.

#

def substrings(s):

# Write your code here

MOD = 1000000007

n = len(s)

for i in range(1, n):

ans = 0

for i in range(n):

# 1 * 11 * 1 + 6 * 1 * 2

# print(ans) 16 -> 11, 23

ans %= MOD

return ans

if __name__ == '__main__':

n = input()

result = substrings(n)

fptr.write(str(result) + '\n')

fptr.close()

メモ

https://www.youtube.com/watch?v=kXS66eP0T6s

https://scrapbox.io/files/61d24a828b5049001df7341f.png