Help me in solving MEXXOR problem

help
,
1

My issue

cook your dish here

def find_mex_of_xor(T, test_cases):
results =
for L, R, X in test_cases:
# Create the XOR set S
S = set((L + i) ^ X for i in range(R - L + 1))

    # Find the MEX
    mex = 0
    while mex in S:
        mex += 1
    results.append(mex)
return results

Input reading

T = int(input()) # Number of test cases
test_cases = [tuple(map(int, input().split())) for _ in range(T)]

Processing

results = find_mex_of_xor(T, test_cases)

Output results

for res in results:
print(res)
what is the problem with this code
task # 2 has runtime error

My code

# cook your dish here
def find_mex_of_xor(T, test_cases):
    results = []
    for L, R, X in test_cases:
        # Create the XOR set S
        S = set((L + i) ^ X for i in range(R - L + 1))
        
        # Find the MEX
        mex = 0
        while mex in S:
            mex += 1
        results.append(mex)
    return results

# Input reading
T = int(input())  # Number of test cases
test_cases = [tuple(map(int, input().split())) for _ in range(T)]

# Processing
results = find_mex_of_xor(T, test_cases)

# Output results
for res in results:
    print(res)

Problem Link: MEX of XOR Practice Coding Problem