原题:  Turn the pokers       思路:假设正面为0,反面为1.牌就像这样 000000....... .考虑到假如可以实现最终反面个数为m, 牌共n张, 则这n张排任取m个为反面其余都为正面的状况都能实现.于是转化为考虑最终可能出现1的个数的集合有哪些.       因为可能的个数集合是连续的(在最大最小值之内相差2的都可能), 所以每一次翻转之后的上下限都可以根据上一次所得的上下限推出.       最后算排列组合的适合需要用到组合数递推公式和费马小定理推论\( a^{p…

Turn the pokers Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 1064    Accepted Submission(s): 398 Problem Description During summer vacation,Alice stay at home for a long time, with nothing to…

Turn the pokers Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 1265    Accepted Submission(s): 465 Problem Description During summer vacation,Alice stay at home for a long time, with nothing t…

HDU 4869 Turn the pokers 题目链接 题意:给定n个翻转扑克方式,每次方式相应能够选择当中xi张进行翻转.一共同拥有m张牌.问最后翻转之后的情况数 思路:对于每一些翻转,假设能确定终于正面向上张数的情况,那么全部的情况就是全部情况的C(m, 张数)之和.那么这个张数进行推理会发现,事实上会有一个上下界,每隔2个位置的数字就是能够的方案,由于在翻牌的时候,相应的肯定会有牌被翻转,而假设向上牌少翻一张,向下牌就要多翻一张.奇偶性是不变的,因此仅仅要每次输入张数,维护上下界,最后…

Turn the pokers Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 316    Accepted Submission(s): 101 Problem Description During summer vacation,Alice stay at home for a long time, with nothing to…

Turn the pokers Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 196    Accepted Submission(s): 51 Problem Description During summer vacation,Alice stay at home for a long time, with nothing to…

最后的结果中正面向上的奇偶性是一定的,计算出正面向上的范围low,up 结果即为 C(m.low)+ C(m.low+2) +.... + C(m,up) ,用逆元取模 Turn the pokers Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 828    Accepted Submission(s): 302 Problem D…

Turn the pokers Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 108    Accepted Submission(s): 21 Problem Description During summer vacation,Alice stay at home for a long time, with nothing to…

pid=4869" target="_blank">Turn the pokers 大意:给出n次操作,给出m个扑克.然后给出n个操作的个数a[i],每一个a[i]代表能够翻的扑克的个数,求最后可能出现的扑克的组合情况. Hint Sample Input: 3 3 3 2 3 For the this example: 0 express face down,1 express face up Initial state 000 The first result:00…

Problem Description During summer vacation,Alice stay at home for a long time, with nothing to do. She went out and bought m pokers, tending to play poker. But she hated the traditional gameplay. She wants to change. She puts these pokers face down,…