Buggy python submission (verdict: Runtime Error):
def main():
    a,b = map(int,input().split())
    if a+(a-a%673)%a:
        print(0)
    else:
        mini = 2020
        for i in range(a,b+1):
            for j in range(a,i):
                joke = i*j%2019
                if joke<mini:
                    mini = joke
                    if mini == 0:
                        print(0)
                        return 0
        print(mini)
main()

Fixed submission:
def main():
    a,b = map(int,input().split())
    if a-b+1>=2019:
        print(0)
    else:
        mini = 2020
        for i in range(a,b+1):
            for j in range(a,i):
                joke = i*j%2019
                if joke<mini:
                    mini = joke
                    if mini == 0:
                        print(0)
                        return 0
        print(mini)
main()

Buggy python submission (verdict: Time Limit Exceeded):
def main():
    a,b = map(int,input().split())
    if a-b+1>=673:
        print(0)
    else:
        mini = 2020
        for i in range(a,b+1):
            for j in range(a,i):
                joke = i*j%2019
                if joke<mini:
                    mini = joke
        print(mini)
main()

Fixed submission:
def main():
    a,b = map(int,input().split())
    if a-b+1>=2019:
        print(0)
    else:
        mini = 2020
        for i in range(a,b+1):
            for j in range(a,i):
                joke = i*j%2019
                if joke<mini:
                    mini = joke
                    if mini == 0:
                        print(0)
                        return 0
        print(mini)
main()

Buggy python submission (verdict: Time Limit Exceeded):
def main():
    a,b = map(int,input().split())
    if a-b+1>=2019:
        print(0)
    else:
        mini = 2020
        for i in range(a,b+1):
            for j in range(a,i):
                joke = i*j%2019
                if joke<mini:
                    mini = joke
        print(mini)
main()

Fixed submission:
def main():
    a,b = map(int,input().split())
    if a-b+1>=2019:
        print(0)
    else:
        mini = 2020
        for i in range(a,b+1):
            for j in range(a,i):
                joke = i*j%2019
                if joke<mini:
                    mini = joke
                    if mini == 0:
                        print(0)
                        return 0
        print(mini)
main()

Buggy python submission (verdict: Runtime Error):
#include<bits/stdc++.h>
using namespace std;

int main()
{
    int l,r,c;
    cin>>l>>r;

    c=((l*(l+1))%2019);
    cout<<c<<endl;
    return 0;
}

Fixed submission:
def main():
    a,b = map(int,input().split())
    if a-b+1>=2019:
        print(0)
    else:
        mini = 2020
        for i in range(a,b+1):
            for j in range(a,i):
                joke = i*j%2019
                if joke<mini:
                    mini = joke
                    if mini == 0:
                        print(0)
                        return 0
        print(mini)
main()

Buggy python submission (verdict: Runtime Error):
a=int(input())
b=int(input())
c=((a)*(a+1))%2019
print(c)

Fixed submission:
def main():
    a,b = map(int,input().split())
    if a-b+1>=2019:
        print(0)
    else:
        mini = 2020
        for i in range(a,b+1):
            for j in range(a,i):
                joke = i*j%2019
                if joke<mini:
                    mini = joke
                    if mini == 0:
                        print(0)
                        return 0
        print(mini)
main()