Nested Dolls Time Limit: 3000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 2704 Accepted Submission(s): 802 Problem Description Dilworth is the world’s most prominent collector of Russian nested dolls: he…
DP是真的难啊,感觉始终不入门路,还是太弱了┭┮﹏┭┮ DAG上的DP 一般而言,题目中如果存在明显的严格偏序关系,并且求依靠此关系的最大/最小值,那么考虑是求DAG上的最短路或者是最长路.(据说还有路径计数的问题,我倒是没遇到,哪位大大看见提醒一下呐) 这类问题可以使用记忆化搜索直接解,但是有爆栈的风险. 数据比较大的情况下,可以使用先求拓扑序,然后按照拓扑序(bfs求拓扑序),进行递推即可. 背包问题 1.完全背包 for (int i = 1; i <= n; i++) for (…
Constructing Roads In JGShining's Kingdom Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 16047 Accepted Submission(s): 4580 Problem Description JGShining's kingdom consists of 2n(n is no mor…