XA科研 - 博客园

2021年3月9日

摘要： A game of numbers has the following rules: at the beginning, two distinct positive integers are given by the judge. Then each player in turn must give 阅读全文

posted @ 2021-03-09 22:38 XA科研阅读(49) 评论(0) 推荐(0) 编辑

7-1 Prime Day (20 分)

摘要： The above picture is from Sina Weibo, showing May 23rd, 2019 as a very cool "Prime Day". That is, not only that the corresponding number of the date 2 阅读全文

posted @ 2021-03-09 21:40 XA科研阅读(29) 评论(0) 推荐(0) 编辑

2021年3月6日

1101 Quick Sort (25 分)

摘要： There is a classical process named partition in the famous quick sort algorithm. In this process we typically choose one element as the pivot. Then th 阅读全文

posted @ 2021-03-06 18:26 XA科研阅读(47) 评论(0) 推荐(0) 编辑

1093 Count PAT's (25 分)

摘要： The string APPAPT contains two PAT's as substrings. The first one is formed by the 2nd, the 4th, and the 6th characters, and the second one is formed 阅读全文

posted @ 2021-03-06 17:18 XA科研阅读(44) 评论(0) 推荐(0) 编辑

1128 N Queens Puzzle (20 分)

摘要： The "eight queens puzzle" is the problem of placing eight chess queens on an 8 chessboard so that no two queens threaten each other. Thus, a solution 阅读全文

posted @ 2021-03-06 00:49 XA科研阅读(47) 评论(0) 推荐(0) 编辑

N皇后问题

摘要：模板： #include<bits/stdc++.h> using namespace std; const int maxn=10; int a[maxn];//a[i]表示第i行上的皇后放于a[i]列上，假设a[3]=7:放在第3行第7列上 int cnt=0,n; bool check(int 阅读全文

posted @ 2021-03-06 00:32 XA科研阅读(43) 评论(0) 推荐(0) 编辑

2021年3月5日

1038 Recover the Smallest Number (30 分)

摘要： Given a collection of number segments, you are supposed to recover the smallest number from them. For example, given { 32, 321, 3214, 0229, 87 }, we c 阅读全文

posted @ 2021-03-05 23:01 XA科研阅读(61) 评论(0) 推荐(0) 编辑

1067 Sort with Swap(0, i) (25 分)

摘要： Given any permutation of the numbers {0, 1, 2,..., N−1}, it is easy to sort them in increasing order. But what if Swap(0, *) is the ONLY operation tha 阅读全文

posted @ 2021-03-05 22:42 XA科研阅读(56) 评论(0) 推荐(0) 编辑

1037 Magic Coupon (25 分)

摘要： The magic shop in Mars is offering some magic coupons. Each coupon has an integer N printed on it, meaning that when you use this coupon with a produc 阅读全文

posted @ 2021-03-05 21:50 XA科研阅读(74) 评论(0) 推荐(0) 编辑

随笔（五）

摘要：最近在读一本神书，真是相见恨晚，如果高中就遇见这本书，我一定读它几十遍，可惜现在该考研了，不过还是可以用零碎时间读完的，而且对考研绝对有帮助。后期再透漏书名。昨天又发现了一本神书，准备开学就购买。真感觉自己捡到宝了，再次感谢华科的学长推荐的课程。阅读全文

posted @ 2021-03-05 21:34 XA科研阅读(37) 评论(0) 推荐(0) 编辑

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