Buggy python submission (verdict: Runtime Error):
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines


def solve(S):
    dp = [0] * 2019
    pow10 = 1
    answer = 0
    for x in S[::-1]:
        dp[0] += 1
        x = x * pow10 % 2019
        newdp = [0] * 2019
        for i in range(x, 2019):
            newdp[x+i] += dp[i]
        for i in range(x):
            newdp[i] += dp[2019-x+i]
        answer += newdp[0]
        pow10 *= 10
        pow10 %= 2019
        dp = newdp
    return answer


S = [x - ord('0') for x in read().rstrip()]
print(solve(S))


Fixed submission:
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
import numpy as np
from numba import njit

@njit('(i4[:],)')
def solve(S):
    dp = np.zeros(2019, np.int64)
    pow10 = 1
    answer = 0
    for x in S[::-1]:
        dp[0] += 1
        x = x * pow10 % 2019
        newdp = np.zeros_like(dp)
        newdp[x:] += dp[:-x]
        newdp[:x] += dp[-x:]
        answer += newdp[0]
        pow10 *= 10
        pow10 %= 2019
        dp = newdp
    return answer


S = np.array(list(read().rstrip()), dtype=np.int32) - ord('0')
print(solve(S))

Buggy python submission (verdict: Runtime Error):
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
import numpy as np


def solve(S):
    dp = [0] * 2019
    pow10 = 1
    answer = 0
    for x in S[::-1]:
        dp[0] += 1
        x = x * pow10 % 2019
        newdp = np.zeros_like(dp)
        for i in range(x, 2019):
            newdp[x+i] += dp[i]
        for i in range(x):
            newdp[i] += dp[2019-x+i]
        answer += newdp[0]
        pow10 *= 10
        pow10 %= 2019
        dp = newdp
    return answer


S = [x - ord('0') for x in read().rstrip()]
print(solve(S))


Fixed submission:
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
import numpy as np
from numba import njit

@njit('(i4[:],)')
def solve(S):
    dp = np.zeros(2019, np.int64)
    pow10 = 1
    answer = 0
    for x in S[::-1]:
        dp[0] += 1
        x = x * pow10 % 2019
        newdp = np.zeros_like(dp)
        newdp[x:] += dp[:-x]
        newdp[:x] += dp[-x:]
        answer += newdp[0]
        pow10 *= 10
        pow10 %= 2019
        dp = newdp
    return answer


S = np.array(list(read().rstrip()), dtype=np.int32) - ord('0')
print(solve(S))

Buggy python submission (verdict: Runtime Error):
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
import numpy as np
from numba import njit

@njit('i4[:]')
def solve(S):
    dp = np.zeros(2019, np.int64)
    pow10 = 1
    answer = 0
    for x in S[::-1]:
        dp[0] += 1
        x = x * pow10 % 2019
        newdp = np.zeros_like(dp)
        newdp[x:] += dp[:-x]
        newdp[:x] += dp[-x:]
        answer += newdp[0]
        pow10 *= 10
        pow10 %= 2019
        dp = newdp
    return answer


S = np.array(list(read().rstrip()), dtype=np.int32) - ord('0')
print(solve(S))


Fixed submission:
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
import numpy as np
from numba import njit

@njit('(i4[:],)')
def solve(S):
    dp = np.zeros(2019, np.int64)
    pow10 = 1
    answer = 0
    for x in S[::-1]:
        dp[0] += 1
        x = x * pow10 % 2019
        newdp = np.zeros_like(dp)
        newdp[x:] += dp[:-x]
        newdp[:x] += dp[-x:]
        answer += newdp[0]
        pow10 *= 10
        pow10 %= 2019
        dp = newdp
    return answer


S = np.array(list(read().rstrip()), dtype=np.int32) - ord('0')
print(solve(S))

Buggy python submission (verdict: Time Limit Exceeded):
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
import numpy as np


def solve(S):
    dp = np.zeros(2019, np.int64)
    pow10 = 1
    answer = 0
    for x in S[::-1]:
        dp[0] += 1
        x = x * pow10 % 2019
        newdp = np.zeros_like(dp)
        newdp[x:] += dp[:-x]
        newdp[:x] += dp[-x:]
        answer += newdp[0]
        pow10 *= 10
        pow10 %= 2019
        dp = newdp
    return answer


S = np.array(list(read().rstrip()), dtype=np.int32) - ord('0')
print(solve(S))


Fixed submission:
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
import numpy as np
from numba import njit

@njit('(i4[:],)')
def solve(S):
    dp = np.zeros(2019, np.int64)
    pow10 = 1
    answer = 0
    for x in S[::-1]:
        dp[0] += 1
        x = x * pow10 % 2019
        newdp = np.zeros_like(dp)
        newdp[x:] += dp[:-x]
        newdp[:x] += dp[-x:]
        answer += newdp[0]
        pow10 *= 10
        pow10 %= 2019
        dp = newdp
    return answer


S = np.array(list(read().rstrip()), dtype=np.int32) - ord('0')
print(solve(S))