数位动态规划     数位动态规划是求解一个大区间[L, R]中间满足条件Q的所有数字的个数(或者和,或其他)的一种方法.它通过分析每一位上的数字,一般用 dp[len][digit][...] 来表示状态“len位长的数字,最高位数字为digit所具有的xx特性”,利用记忆化搜索保存中间结果,从而加快求解速度.     通过求 f(n) 从0到n中满足条件Q的数字的个数,则所求的结果为 f(R) - f(L-1). 题目大意     给定数字n,找出从0到n中满足条件“数字k中有49(4和9连…

Bomb Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 131072/65536 K (Java/Others)Total Submission(s): 16362    Accepted Submission(s): 5979 Problem Description The counter-terrorists found a time bomb in the dust. But this time the terrorists…

Given a 2D grid, each cell is either a wall 'W', an enemy 'E' or empty '0' (the number zero), return the maximum enemies you can kill using one bomb. The bomb kills all the enemies in the same row and column from the planted point until it hits the w…

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Bomb Game Time Limit: 10000/3000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 2951    Accepted Submission(s): 984 Problem Description Robbie is playing an interesting computer game. The game field is an unbounded…

Description The counter-terrorists found a time bomb in the dust. But this time the terrorists improve on the time bomb. The number sequence of the time bomb counts from 1 to N. If the current number sequence includes the sub-sequence "49", the…

题目链接: 传送门 One Bomb time limit per test:1 second     memory limit per test:256 megabytes Description You are given a description of a depot. It is a rectangular checkered field of n × m size. Each cell in a field can be empty (".") or it can be o…

http://acm.hdu.edu.cn/showproblem.php?pid=3555 Bomb Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 131072/65536 K (Java/Others) Total Submission(s): 7316    Accepted Submission(s): 2551 Problem Description The counter-terrorists found a time…

[HDU3555]Bomb 试题描述 The counter-terrorists found a time bomb in the dust. But this time the terrorists improve on the time bomb. The number sequence of the time bomb counts from 1 to N. If the current number sequence includes the sub-sequence "49"…

Bomb Problem Description There are N bombs needing exploding.Each bomb has three attributes: exploding radius ri, position (xi,yi) and lighting-cost ci which means you need to pay ci cost making it explode.If a un-lighting bomb is in or on the border…