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Optional Chaining as an Alternative to Forced Unwrapping
?与!的区别 You specify optional chaining by placing a question mark (?) after the optional value on which you wish to call a property, method or subscript ...
分类:移动开发   时间:2018-04-04 20:55:57    阅读次数:288
UVA-10859 Placing Lampposts
题目大意: 有一个无向无环图, 现在要选出一些点, 会覆盖和选出的点相连的边. 先要求选出的点最少的情况下, 被覆盖两次的边最多, 输出选出的点数, 被覆盖两次的边数和被覆盖一次的边数. 这个题, 怎么说呢, 很好.... 其实题目说的无向无环图就是森林, 而求最小灯数的情况下最大化被覆盖两次的边, ...
分类:其他好文   时间:2017-10-16 16:47:01    阅读次数:138
UVA - 10859 Placing Lampposts
Placing Lampposts 传送门:https://vjudge.net/problem/UVA-10859 题目大意:给你一片森林,要求你在一些节点上放上灯,一个点放灯能照亮与之相连的所有的边。问你最小化防止的灯数,在灯数相同的条件下,最大化两个点都有灯的边数。题解: 首先有一个套路,也是 ...
分类:其他好文   时间:2017-10-13 23:53:59    阅读次数:425
UVA 10859 Placing Lampposts
题目大意:给一个森林,让你选择尽可能少的点,使每条边至少有一个端点被选择,同时最大化两端都被选择的边。 ...
分类:其他好文   时间:2017-10-13 16:12:27    阅读次数:180
POJ-2528-Mayor's posters
The citizens of Bytetown, AB, could not stand that the candidates in the mayoral election campaign have been placing their electoral posters at all pl ...
分类:其他好文   时间:2017-09-25 17:34:28    阅读次数:189
UVA10859 Placing Lampposts
题意:给一个无向无环图(n<1000),在尽量少的节点上放灯,使得所有边都被照亮,灯可以照亮相邻的边,在灯数最小的前提下,使得被两盏灯照亮的边最多,输出灯数以及被两盏灯照亮的边数,及剩下的边数 ...
分类:其他好文   时间:2017-09-03 15:33:57    阅读次数:151
UVA - 10859 Placing Lampposts
As a part of the mission ‘Beautification of Dhaka City’, the government has decided to replace all the old lampposts with new expensive ones. Since th ...
分类:其他好文   时间:2017-08-30 23:41:37    阅读次数:247
leetcode--51. N-Queens
1、问题描述: The n-queens puzzle is the problem of placing n queens on an n×n chessboard such that no two queens attack each other. Given an integer n, ret ...
分类:其他好文   时间:2017-08-27 15:24:25    阅读次数:158
Mayor's posters POJ - 2528
The citizens of Bytetown, AB, could not stand that the candidates in the mayoral election campaign have been placing their electoral posters at all pl ...
分类:其他好文   时间:2017-08-25 12:32:37    阅读次数:189
51. N-Queens
The n-queens puzzle is the problem of placing n queens on an n×n chessboard such that no two queens attack each other. Given an integer n, return all ... ...
分类:其他好文   时间:2017-07-24 19:04:18    阅读次数:180
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