You are given a 0-indexed integer array nums of length n where n is the total number of students in the class. The class teacher tries to select a group of students so that all the students remain happy.
The ith student will become happy if one of these two conditions is met:
Return the number of ways to select a group of students so that everyone remains happy.
Examples
Example 1
Input: nums = [1,1]
Output: 2
Explanation:
The two possible ways are:
The class teacher selects no student.
The class teacher selects both students to form the group.
If the class teacher selects just one student to form a group then the both students will not be happy. Therefore, there are only two possible ways.
Example 2
Input: nums = [6,0,3,3,6,7,2,7]
Output: 3
Explanation:
The three possible ways are:
The class teacher selects the student with index = 1 to form the group.
The class teacher selects the students with index = 1, 2, 3, 6 to form the group.
The class teacher selects all the students to form the group.
Constraints
1 <= nums.length <= 105
0 <= nums[i] < nums.length
2860. Happy Students
Medium
30 Points
Array
Sorting
Enumeration
You are given a 0-indexed integer array nums of length n where n is the total number of students in the class. The class teacher tries to select a group of students so that all the students remain happy.
The ith student will become happy if one of these two conditions is met:
Return the number of ways to select a group of students so that everyone remains happy.
Examples
Example 1
Input: nums = [1,1]
Output: 2
Explanation:
The two possible ways are:
The class teacher selects no student.
The class teacher selects both students to form the group.
If the class teacher selects just one student to form a group then the both students will not be happy. Therefore, there are only two possible ways.
Example 2
Input: nums = [6,0,3,3,6,7,2,7]
Output: 3
Explanation:
The three possible ways are:
The class teacher selects the student with index = 1 to form the group.
The class teacher selects the students with index = 1, 2, 3, 6 to form the group.
The class teacher selects all the students to form the group.