306,Additive Number,29.4%,Medium,0.6788194694611859, https://leetcode.com/problems/additive-number 54,Spiral Matrix,34.1%,Medium,0.42911099324046365, https://leetcode.com/problems/spiral-matrix 38,Count and Say,44.6%,Easy,0.17940251701974141, https://leetcode.com/problems/count-and-say 20,Valid Parentheses,39.0%,Easy,0.020517047266669974, https://leetcode.com/problems/valid-parentheses 728,Self Dividing Numbers,74.3%,Easy,0, https://leetcode.com/problems/self-dividing-numbers 1215,Stepping Numbers,41.6%,Medium,0, https://leetcode.com/problems/stepping-numbers