diff options
Diffstat (limited to 'other/new_21_game.cpp')
-rw-r--r-- | other/new_21_game.cpp | 40 |
1 files changed, 0 insertions, 40 deletions
diff --git a/other/new_21_game.cpp b/other/new_21_game.cpp deleted file mode 100644 index dc21609..0000000 --- a/other/new_21_game.cpp +++ /dev/null @@ -1,40 +0,0 @@ -// 837. New 21 Game -#include "leetcode.h" - -/* - * alice plays the following game, loosely based on the card game "21". alice - * starts with 0 points and draws numbers while she has less than 'k' points. - * during each draw, she gains an integer number of points randomly from range - * '[1, max_pts]', where 'max_pts' is an integer. each draw is independent and - * the outcomes have equal posibilities. alice stops drawing numbers when she - * gets 'k' or more points. return the probability that alice has 'n' or fewer - * points. answers within 10^-5 of the actual answer are considered accepted - */ - -class Solution { -public: - double new21Game(int n, int k, int max_pts) { - if (!k || n >= k + max_pts) - return 1.0; - vector<double> dp(n + 1); - dp[0] = 1.0; - double sum = 1.0, ans = 0.0; - for (int i = 1; i <= n; ++i) { - dp[i] = sum / max_pts; - if (i < k) - sum += dp[i]; - else - ans += dp[i]; - if (i - max_pts >= 0) - sum -= dp[i - max_pts]; - } - return ans; - } -}; - -int main() { - Solution obj; - printf("%f\n", obj.new21Game(10, 1, 10)); // expect: 1.00000 - printf("%f\n", obj.new21Game(6, 1, 10)); // expect: 0.60000 - printf("%f\n", obj.new21Game(21, 17, 10)); // expect: 0.73278 -} |