t = int(input())
for case in range(1, t+1):
impossible = False
n = int(input())
activities = {i: list(map(int, input().split())) for i in range(n)}
sorted_activities = sorted(activities.items(), key=lambda item: item[1])
c = [sorted_activities[0][0]]
j = []
for activity in sorted_activities:
if activity[0] not in c:
if activities[c[-1]][1] <= activity[1][0]:
c.append(activity[0])
else:
if len(j) == 0 or activities[j[-1]][1] <= activity[1][0]:
j.append(activity[0])
else:
impossible = True
break
if not impossible:
result = ''
for i in range(n):
if i in c:
result += 'C'
elif i in j:
result += 'J'
print('Case #{}: {}'.format(case, result))
else:
print('Case #{}: IMPOSSIBLE'.format(case))
This was my approach using Python3
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