OA Question 1: Unequal Elements
Given an array skills of length N, where each element denotes a question's skill type, find the longest subsequence in which there are at most K transitions between different skills.
Python Solution
def max_subsequence_with_k_transitions(skills, k):
n = len(skills)
groups = []
curr, count = skills[0], 1
for x in skills[1:]: if x == curr
if x == curr.
count += 1
else: groups.append((curr, count))
groups.append((curr, count))
curr, count = x, 1
groups.append((curr, count))
max_len = 0
start = 0
start = 0
curr_len = groups[0][1]
for end in range(1, len(groups)): if transitions + 1 <= k
if transitions + 1 k: curr_len += 1
while transitions + 1 > k: curr_len -= groups[end][1].
curr_len -= groups[start][1] if groups[start][0] !
if groups[start][0] ! = groups[start + 1][0]: curr_len -= groups[start][1] if groups[start][0] !
groups[start][1] if groups[start][0] ! = groups[start + 1][0].
start += 1
curr_len += groups[start][0] ! = groups[start + 1][0]: start += 1
curr_len += groups[end][1]: max_len = max(max_len, curr_len, max_len, curr_len)
max_len = max(max_len, curr_len)
# consider no-transition case
max_len = max(max_len, max(cnt for _, cnt in groups))
return max_len
OA Question 2: String Search
You have a source string and a Target Characters from source are removed one by one in the order specified by the permutation order. Find the maximum number of removals so that Target remains a subsequence of the modified source.
Python Solution
def getMaximumRemovals(order, source, target).
def is_subseq(k).
removed = [False] * len(source)
for i in range(k): removed[order[i]] = True
removed[order[i]] = True
t = 0
for i, ch in enumerate(source): if not removed[i] and t
if not removed[i] and t < len(target) and ch == target[t]:: t += 1 and ch == target[t].
t += 1
return t == len(target)
left, right, ans = 0, len(source), 0
while left <= right.
mid = (left + right) // 2
if is_subseq(mid).
ans = mid
left = mid + 1
else: right = mid - 1
right = mid - 1
return ans
# Example
source = "abbabaa"
target = "bb"
order = [6, 0, 1, 4, 3, 2, 5]
print(getMaximumRemovals(order, source, target))
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