首页 > ACM题库 > HDU-杭电 > hdu 2355 The Sidewinder Sleeps Tonite待解决[解题报告]C++
2014
01-05

hdu 2355 The Sidewinder Sleeps Tonite待解决[解题报告]C++

The Sidewinder Sleeps Tonite

问题描述 :

Slitherlink is a type of logic puzzle made popular by Nikoli, the same Japanese puzzle company that has made Sudoku popular the world over. Like
most good logic puzzles, it has a set of very basic rules that can nonetheless result in devilishly difficult (and delightful!) puzzling experiences.

The rules of Slitherlink are as follows:

A Slitherlink board is made up of a lattice of dots; in this problem, it will be a regular rectangular lattice.
Some of the boxes (or cells) defined by the lattice have numbers within them; with a regular rectangular lattice, the numbers will be between 0
and 3 inclusive.
The goal of a Slitherlink puzzle is to connect adjacent dots (horizontally or vertically, like the sides of boxes) so that there is a single loop that
never crosses itself, with no line segments that are not part of the loop (no "dangling" segments or other, separate loops) such that every cell
that has a number has exactly that many sides as segments of the loop.

Given a supposedly solved Slitherlink puzzle, your task will be to determine whether or not it is indeed legitimately solved.

输入:

Input to this problem will begin with a line containing a single integer N (1 ≤ N ≤ 100) indicating the number of data sets. Each data set consists of
the following components:

A line containing two integers H, W (1 ≤ H,W ≤ 20) representing the height and width of the Slitherlink puzzle by the number of cells (not
dots!) per edge;
A series of 2H + 1 lines representing the Slitherlink puzzle, using the following non-whitespace characters:
0, 1, 2, 3, ?: The numbers written inside a given cell. A ? represents an empty cell, as in the example graphic above.
#: A dot in the lattice.
-, |: A horizontal or vertical line segment.
.: An empty adjacency between two dots in the lattice.

Note that all Slitherlink puzzles will be fully represented; that is, there is no internal whitespace on a given line to represent empty cells or
adjacencies.

输出:

Input to this problem will begin with a line containing a single integer N (1 ≤ N ≤ 100) indicating the number of data sets. Each data set consists of
the following components:

A line containing two integers H, W (1 ≤ H,W ≤ 20) representing the height and width of the Slitherlink puzzle by the number of cells (not
dots!) per edge;
A series of 2H + 1 lines representing the Slitherlink puzzle, using the following non-whitespace characters:
0, 1, 2, 3, ?: The numbers written inside a given cell. A ? represents an empty cell, as in the example graphic above.
#: A dot in the lattice.
-, |: A horizontal or vertical line segment.
.: An empty adjacency between two dots in the lattice.

Note that all Slitherlink puzzles will be fully represented; that is, there is no internal whitespace on a given line to represent empty cells or
adjacencies.

样例输入:

2
5 5
#-#-#-#-#-#
|?.?.?.1.3|
#.#-#-#.#-#
|?|?.?|?|?.
#-#.#.#.#-#
.2.0.2|?.?|
#-#.#-#.#-#
|?|3|?.?|2.
#.#-#.#-#.#
|?.?.2|?.0.
#-#-#-#.#.#
5 5
#-#-#-#-#-#
|?|?.?.1.3|
#.#-#-#.#-#
|?|?.?|?|?.
#-#.#.#.#-#
.2.0.2|?.?|
#-#.#-#.#-#
|?|3|?.?|2.
#.#-#.#-#.#
|?.?.2|?.0.
#-#-#-#-#.#

样例输出:

VALID
INVALID


  1. 代码不对,仔细对比一下输入输出, 怎么会有‘‘printf("The winning moves are:");’’这种输出呢?

  2. 在方法1里面:

    //遍历所有的边,计算入度
    for(int i=0; i<V; i++)
    {
    degree = 0;
    for (j = adj .begin(); j != adj .end(); ++j)
    {
    degree[*j]++;
    }
    }

    为什么每遍历一条链表,要首先将每个链表头的顶点的入度置为0呢?
    比如顶点5,若在顶点1、2、3、4的链表中出现过顶点5,那么要增加顶点5的入度,但是在遍历顶点5的链表时,又将顶点5的入度置为0了,那之前的从顶点1234到顶点5的边不是都没了吗?