Buggy python submission (verdict: Time Limit Exceeded):
import sys
input = lambda : sys.stdin.readline().rstrip()

import collections
s = [int(c) for c in input()]
tmp = 1
mod = 0
count = collections.defaultdict(int)
for i,num in enumerate(s[::-1]):
    mod = (tmp * num + mod) % 2019
    count[mod] += 1
    tmp *= 10
count[0] += 1
print(sum((item*(item-1)//2 for item in count.values())))

Fixed submission:
import sys
input = lambda : sys.stdin.readline().rstrip()

import collections
s = [int(c) for c in input()]
tmp = 1
mod = 0
count = collections.defaultdict(int)
for i,num in enumerate(s[::-1]):
    mod = (tmp * num + mod) % 2019
    count[mod] += 1
    tmp *= 10
    tmp %= 2019
count[0] += 1
print(sum((item*(item-1)//2 for item in count.values())))

Buggy python submission (verdict: Time Limit Exceeded):
import collections
s = [int(c) for c in input()]
tmp = 1
mod = 0
count = collections.defaultdict(int)
for i,num in enumerate(s[::-1]):
    mod = (tmp * num + mod) % 2019
    count[mod] += 1
    tmp *= 10
count[0] += 1
print(sum((item*(item-1)//2 for item in count.values())))

Fixed submission:
import sys
input = lambda : sys.stdin.readline().rstrip()

import collections
s = [int(c) for c in input()]
tmp = 1
mod = 0
count = collections.defaultdict(int)
for i,num in enumerate(s[::-1]):
    mod = (tmp * num + mod) % 2019
    count[mod] += 1
    tmp *= 10
    tmp %= 2019
count[0] += 1
print(sum((item*(item-1)//2 for item in count.values())))

Buggy python submission (verdict: Time Limit Exceeded):
import collections
s = [int(c) for c in input()]
tmp = 1
mod = 0
count = collections.defaultdict(int)
for i,num in enumerate(s[::-1]):
    mod = (tmp * num + mod) % 2019
    count[mod] += 1
    tmp *= 10
count[0] += 1
print(sum((item*(item-1)//2 for item in count.values())))

Fixed submission:
import sys
input = lambda : sys.stdin.readline().rstrip()

import collections
s = [int(c) for c in input()]
tmp = 1
mod = 0
count = collections.defaultdict(int)
for i,num in enumerate(s[::-1]):
    mod = (tmp * num + mod) % 2019
    count[mod] += 1
    tmp *= 10
    tmp %= 2019
count[0] += 1
print(sum((item*(item-1)//2 for item in count.values())))

Buggy python submission (verdict: Runtime Error):
import collections
s = [int(c) for c in input()]
tmp = 1
prev = mod
count = collections.defaultdict(int)
for i,num in enumerate(s[::-1]):
    mod = (tmp * num + mod) % 2019
    count[mod] += 1
    tmp *= 10
print(sum((item*(item-1)//2 for item in count.values())))

Fixed submission:
import sys
input = lambda : sys.stdin.readline().rstrip()

import collections
s = [int(c) for c in input()]
tmp = 1
mod = 0
count = collections.defaultdict(int)
for i,num in enumerate(s[::-1]):
    mod = (tmp * num + mod) % 2019
    count[mod] += 1
    tmp *= 10
    tmp %= 2019
count[0] += 1
print(sum((item*(item-1)//2 for item in count.values())))

Buggy python submission (verdict: Time Limit Exceeded):
import collections
s = [int(c) for c in input()]
count = 0
prev = {}
for num in s:
    dp = collections.defaultdict(int)
    dp[num] += 1
    for k,v in prev.items():
        i = (k * 10 + num) % 2019
        dp[i] += v
    count += dp[0]
    prev = dp
print(count)

Fixed submission:
import sys
input = lambda : sys.stdin.readline().rstrip()

import collections
s = [int(c) for c in input()]
tmp = 1
mod = 0
count = collections.defaultdict(int)
for i,num in enumerate(s[::-1]):
    mod = (tmp * num + mod) % 2019
    count[mod] += 1
    tmp *= 10
    tmp %= 2019
count[0] += 1
print(sum((item*(item-1)//2 for item in count.values())))

Buggy python submission (verdict: Time Limit Exceeded):
s = [int(c) for c in input()]
dp = [[0] * 2019 for _ in range(len(s))]

for i,item in enumerate(s):
    dp[i][item] += 1
    for j in range(2019):
        tmp = (10 * j + item) % 2019
        dp[i][tmp] += dp[i-1][j]
#         if dp[i-1][j]!=0:
#             print(i, tmp, dp[i-1][j])
print(sum(dp[j][0] for j in range(len(dp))))

Fixed submission:
import sys
input = lambda : sys.stdin.readline().rstrip()

import collections
s = [int(c) for c in input()]
tmp = 1
mod = 0
count = collections.defaultdict(int)
for i,num in enumerate(s[::-1]):
    mod = (tmp * num + mod) % 2019
    count[mod] += 1
    tmp *= 10
    tmp %= 2019
count[0] += 1
print(sum((item*(item-1)//2 for item in count.values())))