Buggy python submission (verdict: Time Limit Exceeded):
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
from collections import defaultdict 
def main():
    s = readline().rstrip().decode()
    n = len(s)
    T = [0]
    P = 2019
    dd = defaultdict(int)
    dd[0] += 1
    for i in range(1, n+1):
        v = ((ord(s[-i])-ord('0'))*10**(i-1) + T[i-1])%P
        dd[v] += 1
        T.append(v)
    ans = 0
    for v in dd.values():
        ans += v*(v-1)//2
    print(ans)
if __name__ == '__main__':
    main()


Fixed submission:
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
from collections import Counter 
from collections import defaultdict 

def main():
    s = input() 
    n = len(s)
    T = [0]
    P = 2019
    dd = defaultdict(int) 
    dd[0] += 1
    for i in range(1, n+1):
        x = (int(s[-i])*pow(10, i-1, P) + T[i-1])%P
        T.append(x)
        dd[x] += 1
    ans = 0
    for i in dd.values():
        ans += i*(i-1)//2
    print(ans)
if __name__ == '__main__':
    main()

Buggy python submission (verdict: Time Limit Exceeded):
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
from collections import Counter 
from collections import defaultdict 
def main():
    s = input() 
    n = len(s)
    T = [0]
    dd = defaultdict(int) 
    dd[0] += 1
    for i in range(1, n+1):
        x = (int(s[-i])*10**(i-1)%2019+T[i-1]%2019)%2019
        T.append(x)
        dd[x] += 1
    ans = 0
    for i in dd.values():
        ans += i*(i-1)//2
    print(ans)
if __name__ == '__main__':
    main()


Fixed submission:
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
from collections import Counter 
from collections import defaultdict 

def main():
    s = input() 
    n = len(s)
    T = [0]
    P = 2019
    dd = defaultdict(int) 
    dd[0] += 1
    for i in range(1, n+1):
        x = (int(s[-i])*pow(10, i-1, P) + T[i-1])%P
        T.append(x)
        dd[x] += 1
    ans = 0
    for i in dd.values():
        ans += i*(i-1)//2
    print(ans)
if __name__ == '__main__':
    main()

Buggy python submission (verdict: Time Limit Exceeded):
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
from collections import Counter 
from collections import defaultdict 
def main():
    s = input() 
    n = len(s)
    T = [0]
    dd = defaultdict(int) 
    dd[0] += 1
    for i in range(1, n+1):
        T.append((int(s[-i])*10**(i-1)%2019+T[i-1]%2019)%2019)
        dd[(int(s[-i])*10**(i-1)+T[i-1])%2019] += 1
    ans = 0
    for i in dd.values():
        ans += i*(i-1)//2
    print(ans)
if __name__ == '__main__':
    main()


Fixed submission:
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
from collections import Counter 
from collections import defaultdict 

def main():
    s = input() 
    n = len(s)
    T = [0]
    P = 2019
    dd = defaultdict(int) 
    dd[0] += 1
    for i in range(1, n+1):
        x = (int(s[-i])*pow(10, i-1, P) + T[i-1])%P
        T.append(x)
        dd[x] += 1
    ans = 0
    for i in dd.values():
        ans += i*(i-1)//2
    print(ans)
if __name__ == '__main__':
    main()

Buggy python submission (verdict: Time Limit Exceeded):
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
from collections import Counter 
from collections import defaultdict 
def main():
    s = input() 
    n = len(s)
    T = [0]
    dd = defaultdict(int) 
    dd[0] += 1
    for i in range(1, n+1):
        T.append((int(s[-i])*10**(i-1)+T[i-1])%2019)
        dd[(int(s[-i])*10**(i-1)+T[i-1])%2019] += 1
    ans = 0
    for i in dd.values():
        ans += i*(i-1)//2
    print(ans)
if __name__ == '__main__':
    main()


Fixed submission:
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
from collections import Counter 
from collections import defaultdict 

def main():
    s = input() 
    n = len(s)
    T = [0]
    P = 2019
    dd = defaultdict(int) 
    dd[0] += 1
    for i in range(1, n+1):
        x = (int(s[-i])*pow(10, i-1, P) + T[i-1])%P
        T.append(x)
        dd[x] += 1
    ans = 0
    for i in dd.values():
        ans += i*(i-1)//2
    print(ans)
if __name__ == '__main__':
    main()

Buggy python submission (verdict: Time Limit Exceeded):
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
from collections import Counter 
from collections import defaultdict 
def main():
    s = input() 
    s = ''.join(reversed(s))
    n = len(s)
    T = [0]
    dd = defaultdict(int) 
    dd[0] += 1
    for i in range(n):
        T.append((int(s[i])*10**i+T[i])%2019)
        dd[(int(s[i])*10**i+T[i])%2019] += 1
    ans = 0
    for i in dd.values():
        ans += i*(i-1)//2
    print(ans)
if __name__ == '__main__':
    main()


Fixed submission:
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
from collections import Counter 
from collections import defaultdict 

def main():
    s = input() 
    n = len(s)
    T = [0]
    P = 2019
    dd = defaultdict(int) 
    dd[0] += 1
    for i in range(1, n+1):
        x = (int(s[-i])*pow(10, i-1, P) + T[i-1])%P
        T.append(x)
        dd[x] += 1
    ans = 0
    for i in dd.values():
        ans += i*(i-1)//2
    print(ans)
if __name__ == '__main__':
    main()

Buggy python submission (verdict: Runtime Error):
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
from collections import Counter 
def main():
    s = input() 
    s = ''.join(reversed(s))
    n = len(s)
    T = ['0']
    for i in range(n):
        T.append(s[i]+T[i])
    mod_kind = []
    for i in T:
        mod_kind.append(int(i)%2019)
    d = Counter(mod_kind)
    ans = 0
    for i in d.values():
        ans += i*(i-1)//2
    print(ans)
if __name__ == '__main__':
    main()


Fixed submission:
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
from collections import Counter 
from collections import defaultdict 

def main():
    s = input() 
    n = len(s)
    T = [0]
    P = 2019
    dd = defaultdict(int) 
    dd[0] += 1
    for i in range(1, n+1):
        x = (int(s[-i])*pow(10, i-1, P) + T[i-1])%P
        T.append(x)
        dd[x] += 1
    ans = 0
    for i in dd.values():
        ans += i*(i-1)//2
    print(ans)
if __name__ == '__main__':
    main()