Problem p03283 (python)

Fixed submission:
N, M, Q = map(int, input().split())

dp = [[0 for col in range(N)] for row in range(N)]

for i in range(M):
    l, r = map(int, input().split())
    dp[l-1][r-1]+=1

for i in range(N):
    for j in range(N)[:-1]:
        dp[i][j+1] += dp[i][j]
        
for i in range(N)[:0:-1]:
    for j in range(N):
        dp[i-1][j] += dp[i][j]

results = []

for i in range(Q):
    l, r = map(int, input().split())
    results.append(dp[l-1][r-1])

for result in results:
    print(result)

Buggy submission (verdict: Runtime Error):
N, M, Q = map(int, input().split())
trains = {}
answers = {}
results = []
def make_range(L, R):
    return (pow(2, (R-L+1))-1)<<L-1

for i in range(M):
    a, b = map(int, input().split())
    train = make_range(a, b)
    if train in trains:
        trains[train] += 1
    else:
        trains[train] = 1
    
def combine_answer(answers, question, res):
    for other_question in answers:
        combine_question = other_question + question
        if other_question | question == combine_question:
            combine_res = answers[other_question] + res
            combine_answer(answers, combine_question, combine_res)
            answers[combine_question] = combine_res

for i in range(Q):
    a, b = map(int, input().split())
    question = make_range(a, b)
    if question in answers:
        results.append(answers[question])
    else:
        res = 0
        for train in trains:
            if question | train == question:
                res += trains[train]
        for other_question in answers:
            combine_question = other_question + question
            if other_question | question == combine_question:
                combine_res = answers[other_question] + res
                combine_answer(answers, combine_question, combine_res)
                answers[combine_question] = combine_res
        answers[question] = res
        results.append(res)

for result in results:
    print(result)


# 000011 + 111100 = 111111

Buggy submission (verdict: Runtime Error):
N, M, Q = map(int, input().split())
trains = {}
answers = {}
results = []
def make_range(L, R):
    return (pow(2, (R-L+1))-1)<<L-1

for i in range(M):
    a, b = map(int, input().split())
    train = make_range(a, b)
    if train in trains:
        trains[train] += 1
    else:
        trains[train] = 1
    
def combine_answer(answers, question, res):
    for other_question in answers:
        combine_question = other_question + question
        if other_question | question == combine_question:
            combine_res = answers[other_question] + res
            answers[combine_question] = combine_res

for i in range(Q):
    a, b = map(int, input().split())
    question = make_range(a, b)
    if question in answers:
        results.append(answers[question])
    else:
        res = 0
        for train in trains:
            if question | train == question:
                res += trains[train]
        combine_answer(answers, question, res)
        answers[question] = res
        results.append(res)

for result in results:
    print(result)


# 000011 + 111100 = 111111

Buggy submission (verdict: Runtime Error):
N, M, Q = map(int, input().split())
trains = {}
answers = {}
results = []
def make_range(L, R):
    return (pow(2, (R-L+1))-1)<<L-1

for i in range(M):
    a, b = map(int, input().split())
    train = make_range(a, b)
    if train in trains:
        trains[train] += 1
    else:
        trains[train] = 1
    
def combine_answer(answers, question, res):
    for other_question in answers:
        combine_question = other_question + question
        if other_question | question == combine_question:
            combine_res = answers[other_question] + res
            combine_answer(answers, combine_question, combine_res)
            answers[combine_question] = combine_res

for i in range(Q):
    a, b = map(int, input().split())
    question = make_range(a, b)
    if question in answers:
        results.append(answers[question])
    else:
        res = 0
        for train in trains:
            if question | train == question:
                res += trains[train]
        combine_answer(answers, question, res)
        answers[question] = res
        results.append(res)

for result in results:
    print(result)