Buggy python submission (verdict: Runtime Error):
import sys
sys.setrecursionlimit(1000000000)
def XOR(n):
    if n == 1:
        return 1
    else:
        return XOR(n-1)^n
A,B=map(int,input().split())
if A>1:
    print(XOR(B)^XOR(A-1))
else:
    if B > 0:
        print(XOR(B))
    else:
        print(0)


Fixed submission:
#D問題
A,B = map(int,input().split())
def f(n):
    if n%2 == 0:
        if (n//2)%2 == 0:
            return n
        else:
            return n+1
    else:
        if ((n-1)//2)%2 == 0:
            return 1
        else:
            return 0
        
FB = f(B)
FA = f(A-1)
print(FB^FA)

Buggy python submission (verdict: Runtime Error):
import sys
sys.setrecursionlimit(1000000000)
from functools import lru_cache
@lru_cache(maxsize=1000000000)
def XOR(n):
    if n == 1:
        return 1
    else:
        return XOR(n-1)^n
    
A,B=map(int,input().split())
if A>1:
    print(XOR(B)^XOR(A-1))
else:
    if B > 0:
        print(XOR(B))
    else:
        print(0)


Fixed submission:
#D問題
A,B = map(int,input().split())
def f(n):
    if n%2 == 0:
        if (n//2)%2 == 0:
            return n
        else:
            return n+1
    else:
        if ((n-1)//2)%2 == 0:
            return 1
        else:
            return 0
        
FB = f(B)
FA = f(A-1)
print(FB^FA)

Buggy python submission (verdict: Runtime Error):
def XOR(n):
    if n == 1:
        return 1
    else:
        return XOR(n-1)^n
    
A,B=map(int,input().split())
if A>1:
    print(XOR(B)^XOR(A-1))
else:
    print(XOR(B))


Fixed submission:
#D問題
A,B = map(int,input().split())
def f(n):
    if n%2 == 0:
        if (n//2)%2 == 0:
            return n
        else:
            return n+1
    else:
        if ((n-1)//2)%2 == 0:
            return 1
        else:
            return 0
        
FB = f(B)
FA = f(A-1)
print(FB^FA)

Buggy python submission (verdict: Runtime Error):
from functools import lru_cache
@lru_cache(maxsize=1000000000)
def XOR(n):
    if n == 1:
        return 1
    else:
        return XOR(n-1)^n
    
A,B=map(int,input().split())
if A>1:
    print(XOR(B)^XOR(A-1))
else:
    print(XOR(B))

Fixed submission:
#D問題
A,B = map(int,input().split())
def f(n):
    if n%2 == 0:
        if (n//2)%2 == 0:
            return n
        else:
            return n+1
    else:
        if ((n-1)//2)%2 == 0:
            return 1
        else:
            return 0
        
FB = f(B)
FA = f(A-1)
print(FB^FA)

Buggy python submission (verdict: Time Limit Exceeded):
A,B=map(int,input().split())
C=B-A
now=A
XOR=A
for i in range(C):
    now+=1
    XOR^=now
print(XOR)

Fixed submission:
#D問題
A,B = map(int,input().split())
def f(n):
    if n%2 == 0:
        if (n//2)%2 == 0:
            return n
        else:
            return n+1
    else:
        if ((n-1)//2)%2 == 0:
            return 1
        else:
            return 0
        
FB = f(B)
FA = f(A-1)
print(FB^FA)

Buggy python submission (verdict: Time Limit Exceeded):
A,B=map(int,input().split())
C=B-A
now=A
XOR=A
for i in range(C):
    XOR=XOR^(now+1)
    now+=1
print(XOR)

Fixed submission:
#D問題
A,B = map(int,input().split())
def f(n):
    if n%2 == 0:
        if (n//2)%2 == 0:
            return n
        else:
            return n+1
    else:
        if ((n-1)//2)%2 == 0:
            return 1
        else:
            return 0
        
FB = f(B)
FA = f(A-1)
print(FB^FA)