Solution Overview This problem can be solved by Probability Dynamic Programming. We can calculate the expected times of the operation from that of when one more coin is there. if we define dp[i][j][k] as the expected times of the operation…

E - Queen on Grid Overall Solution You can solve this problem by dynamic programming, because if the place of Queen was decided, you can determine the number of cases of the situation and that of visiting goal from that place, uniquely. Yo…

英語の練習で英語で解説記事を書いてみたいと思いますが、いつまで続くかは知りません。英語は話しているときくらいの気持ちで書くのでとてもbroken englishです… atcoder.jp Solution Overview This problem can be solved by bitDP(Dynamic programming). …