摘要：In an array A of 0s and 1s, how many non-empty subarrays have sum S? Example 1: Input: A = [1,0,1,0,1], S = 2 Output: 4 Explanation: The 4 subarrays a 阅读全文

摘要：Every email consists of a local name and a domain name, separated by the @ sign. For example, in , is the local name, and is the domain name. Besides 阅读全文

摘要：(This problem is the same as Minimize Malware Spread, with the differences bolded.) In a network of nodes, each node i is directly connected to anothe 阅读全文