2024-03-18 ARC174 ■A - A Multiply 累積和 ■B - Bought Review 賄賂のパターンは3通り ■C - Catastrophic Roulette dp[i] = p0 * dp[i-1] +p1*(1+dp[i-1])+p2*(1 +dp[i]) + p3*(dp[i-2]) ■D - Digit vs Square Root 実験 ■E - Existence Counting 上手に数え上げ