摘要：A quack is a data structure combining properties of both stacks and queues. It can be viewed as a list of elements written left to right such that thr 阅读全文

摘要：A strobogrammatic number is a number that looks the same when rotated 180 degrees (looked at upside down). Write a function to count the total strobog 阅读全文

摘要：A strobogrammatic number is a number that looks the same when rotated 180 degrees (looked at upside down). Find all strobogrammatic numbers that are o 阅读全文

摘要：Dynamic programming solution State: dp[i]: the minimum cost to cover all positions from[0, i]. (left shift by 1 to get 0 index) // if position i is al 阅读全文