dp[j | a[i]] = Math.min(dp[j | a[i]], dp[j] + 1);
时间: 2024-01-05 14:02:03 浏览: 30
This code is implementing a dynamic programming algorithm for solving a problem.
The problem involves a set of integers a[1], a[2], ..., a[n], and the goal is to find the smallest number of operations needed to obtain a target integer j, using the operations of bitwise OR and increment (adding 1).
The algorithm uses an array dp[j] to store the smallest number of operations needed to obtain j. Initially, all entries in dp[] are set to infinity, except for dp[0] = 0 (since we can obtain 0 with no operations).
Then, for each integer a[i], the algorithm updates the entries dp[j | a[i]] in the dp[] array, using the formula:
dp[j | a[i]] = Math.min(dp[j | a[i]], dp[j] + 1);
This means that if we can obtain j | a[i] using j and a[i], we update dp[j | a[i]] to be the minimum of its current value and dp[j] + 1 (which represents the cost of using the operation j -> j | a[i]).
After processing all integers a[i], the algorithm returns dp[target], which represents the smallest number of operations needed to obtain the target integer.
相关推荐
![pdf](https://img-home.csdnimg.cn/images/20210720083512.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)