Official algorithmic problem description and constraints.
You are given an integer array nums and two integers cost1 and cost2. You are allowed to perform either of the following operations any number of times:
i from nums and increase nums[i] by 1 for a cost of cost1.i, j, from nums and increase nums[i] and nums[j] by 1 for a cost of cost2.Return the minimum cost required to make all elements in the array equal.
Since the answer may be very large, return it modulo 109 + 7.
Example 1:
Input: nums = [4,1], cost1 = 5, cost2 = 2
Output: 15
Explanation:
The following operations can be performed to make the values equal:
nums[1] by 1 for a cost of 5. nums becomes [4,2].nums[1] by 1 for a cost of 5. nums becomes [4,3].nums[1] by 1 for a cost of 5. nums becomes [4,4].The total cost is 15.
Example 2:
Input: nums = [2,3,3,3,5], cost1 = 2, cost2 = 1
Output: 6
Explanation:
The following operations can be performed to make the values equal:
nums[0] and nums[1] by 1 for a cost of 1. nums becomes [3,4,3,3,5].nums[0] and nums[2] by 1 for a cost of 1. nums becomes [4,4,4,3,5].nums[0] and nums[3] by 1 for a cost of 1. nums becomes [5,4,4,4,5].nums[1] and nums[2] by 1 for a cost of 1. nums becomes [5,5,5,4,5].nums[3] by 1 for a cost of 2. nums becomes [5,5,5,5,5].The total cost is 6.
Example 3:
Input: nums = [3,5,3], cost1 = 1, cost2 = 3
Output: 4
Explanation:
The following operations can be performed to make the values equal:
nums[0] by 1 for a cost of 1. nums becomes [4,5,3].nums[0] by 1 for a cost of 1. nums becomes [5,5,3].nums[2] by 1 for a cost of 1. nums becomes [5,5,4].nums[2] by 1 for a cost of 1. nums becomes [5,5,5].The total cost is 4.
Constraints:
1 <= nums.length <= 1051 <= nums[i] <= 1061 <= cost1 <= 1061 <= cost2 <= 106Detailed video explanations, mathematical intuition, and clean C++ implementation code.