945. Minimum Increment to Make Array Unique

Posted 2020-11-24 lychnis

945. Minimum Increment to Make Array Unique

Medium

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Given an array of integers A, a move consists of choosing any A[i], and incrementing it by 1.

Return the least number of moves to make every value in A unique.

 

Example 1:

Input: [1,2,2]
Output: 1
Explanation:  After 1 move, the array could be [1, 2, 3].

Example 2:

Input: [3,2,1,2,1,7]
Output: 6
Explanation:  After 6 moves, the array could be [3, 4, 1, 2, 5, 7].
It can be shown with 5 or less moves that it is impossible for the array to have all unique values.

 

Note:

1. 0 <= A.length <= 40000
2. 0 <= A[i] < 40000

 

Accepted

16,539

Submissions

37,311

 

排序后,每个元素A[i]最少应该是A[0]+i+1, 所以可以计算出need值

 

class Solution {
public:
    int minIncrementForUnique(vector<int>& A) {
        sort(A.begin(),A.end());
        int res=0,need=0;
        for(int i=0;i<A.size();++i)
        {
            res+=max(need-A[i],0);
            need=max(need,A[i])+1;
        }
        return res;
    }
};