There are n people that are split into some unknown number of groups. Each person is labeled with a unique ID from 0 to n - 1.You are given an integer array groupSizes, where groupSizes[i] is the size of the group that person i is in. For example, if groupSizes[1] = 3, then person 1 must be in a group of size 3.Return a list of groups such that each person i is in a group of size groupSizes[i].Each person should appear in exactly one group, and every person must be in a group. If there are multiple answers, return any of them. It is guaranteed that there will be at least one valid solution for the given input. Example 1:Input: groupSizes = [3,3,3,3,3,1,3]Output: [[5],[0,1,2],[3,4,6]]Explanation: The first group is [5]. The size is 1, and groupSizes[5] = 1.The second group is [0,1,2]. The size is 3, and groupSizes[0] = groupSizes[1] = groupSizes[2] = 3.The third group is [3,4,6]. The size is 3, and groupSizes[3] = groupSizes[4] = groupSizes[6] = 3.Other possible solutions are [[2,1,6],[5],[0,4,3]] and [[5],[0,6,2],[4,3,1]].Example 2:Input: groupSizes = [2,1,3,3,3,2]Output: [[1],[0,5],[2,3,4]]
Question
There are n people that are split into some unknown number of groups. Each person is labeled with a unique ID from 0 to n - 1.You are given an integer array groupSizes, where groupSizes[i] is the size of the group that person i is in. For example, if groupSizes[1] = 3, then person 1 must be in a group of size 3.Return a list of groups such that each person i is in a group of size groupSizes[i].Each person should appear in exactly one group, and every person must be in a group. If there are multiple answers, return any of them. It is guaranteed that there will be at least one valid solution for the given input. Example 1:Input: groupSizes = [3,3,3,3,3,1,3]Output: [[5],[0,1,2],[3,4,6]]Explanation: The first group is [5]. The size is 1, and groupSizes[5] = 1.The second group is [0,1,2]. The size is 3, and groupSizes[0] = groupSizes[1] = groupSizes[2] = 3.The third group is [3,4,6]. The size is 3, and groupSizes[3] = groupSizes[4] = groupSizes[6] = 3.Other possible solutions are [[2,1,6],[5],[0,4,3]] and [[5],[0,6,2],[4,3,1]].Example 2:Input: groupSizes = [2,1,3,3,3,2]Output: [[1],[0,5],[2,3,4]]
Solution
To solve this problem, you can use a dictionary to store the groups. The keys of the dictionary will be the group sizes and the values will be the groups themselves.
Here is a Python solution:
def groupThePeople(groupSizes):
groups = {}
result = []
for i, size in enumerate(groupSizes):
if size not in groups:
groups[size] = []
groups[size].append(i)
if len(groups[size]) == size:
result.append(groups[size])
groups[size] = []
return result
This function works by iterating over the groupSizes list. For each person (represented by their index i), it adds them to the group of their size in the groups dictionary. If the group is full (i.e., its length equals its size), it adds the group to the result list and resets the group in the dictionary.
For example, if you call groupThePeople([3,3,3,3,3,1,3]), it will return [[0, 1, 2], [3, 4, 6], [5]].
Similar Questions
Minimum Number of Groups to Create a Valid AssignmentMy SubmissionsBack to ContestUser Accepted:708User Tried:4579Total Accepted:745Total Submissions:10584Difficulty:MediumYou are given a 0-indexed integer array nums of length n.We want to group the indices so for each index i in the range [0, n - 1], it is assigned to exactly one group.A group assignment is valid if the following conditions hold:For every group g, all indices i assigned to group g have the same value in nums.For any two groups g1 and g2, the difference between the number of indices assigned to g1 and g2 should not exceed 1.Return an integer denoting the minimum number of groups needed to create a valid group assignment. Example 1:Input: nums = [3,2,3,2,3]Output: 2Explanation: One way the indices can be assigned to 2 groups is as follows, where the values in square brackets are indices:group 1 -> [0,2,4]group 2 -> [1,3]All indices are assigned to one group.In group 1, nums[0] == nums[2] == nums[4], so all indices have the same value.In group 2, nums[1] == nums[3], so all indices have the same value.The number of indices assigned to group 1 is 3, and the number of indices assigned to group 2 is 2.Their difference doesn't exceed 1.It is not possible to use fewer than 2 groups because, in order to use just 1 group, all indices assigned to that group must have the same value.Hence, the answer is 2.Example 2:Input: nums = [10,10,10,3,1,1]Output: 4Explanation: One way the indices can be assigned to 4 groups is as follows, where the values in square brackets are indices:group 1 -> [0]group 2 -> [1,2]group 3 -> [3]group 4 -> [4,5]The group assignment above satisfies both conditions.It can be shown that it is not possible to create a valid assignment using fewer than 4 groups.Hence, the answer is 4. Constraints:1 <= nums.length <= 1051 <= nums[i] <= 109
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