John Lui questions

• Detecting cycle in an undirected graph using iterative DFS?
• How can I minimise number of additions?
• Why can't I do the counting sort this way?
• Can a static variable be declared extern in C?
• Find minimum cost to convert array to arithmetic progression
• How can I generate all possible sorted arrays from alternate elements of two sorted arrays?
• finding maximum sum of a disjoint sequence of an array
• Finding the largest subarray with equal number of 0's and 1's

John Lui answers