摘要：
链接： https://vjudge.net/problem/HDU 3555 题意： The counter terrorists found a time bomb in the dust. But this time the terrorists improve on the time bom 阅读全文
摘要：
链接: https://vjudge.net/problem/HDU 4352 题意： a 到 b中一个数组成递增子序列长度等于k的数的个数 思路： 因为只有10个数，使用二进制维护一个递增序列，每次更新在注释写了。 然后正常的数位DP， Dp(i, j, k)，i是位置，j是当前的递增状态，k是长 阅读全文
摘要：
链接： https://vjudge.net/problem/CodeForces 55D 题意： Volodya is an odd boy and his taste is strange as well. It seems to him that a positive integer numb 阅读全文
摘要：
链接： https://vjudge.net/problem/LightOJ 1102 题意： As I am fond of making easier problems, I discovered a problem. Actually, the problem is 'how can you 阅读全文