我不得不吐槽：
整理下进来的ccf准备经历：
首先说下java做题的局限：花费时间多，空间多，代码偏长。
在ccf做题时发现我提交的代码不能有中文注释，有中文注释就编译错误，也是无语了。
今天碰到一个问题更是奇葩，我写的程序看起来没问题，提交一直是90分，找不到原因，最后看到网上有个人写的c++代码和我的基本一样，他的提交是100分。我就在研究两个代码的区别，发现测试点就是当矩阵大小为100*100时的递归栈大小。用我的java程序测试，当矩阵达到95*95时，已经栈溢出了。。而同一个程序，c++需要矩阵达到106*106时才溢出。而恰巧题目的量级就是100*100。因此，我的程序是90分，而相同的c++程序却是100分。没办法。暂时碰到这两个头疼的问题。
另一个问题是程序的问题，就是某些题目会明确注明测试点中有30%的数据范围是0-100,50%的数据是0-10000，而100%的数据是100000.这时候，就需要复杂度为O（1）的算法。好好思考一下啊~
另附上我的程序：
import java.util.Scanner;
public class Main{
static int m, n;
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
m = scanner.nextInt();
n = scanner.nextInt();
int q = scanner.nextInt();
scanner.nextLine();
char[][] init = new char[n][m];
for (int i = 0; i < n; i++) {
for (int j = 0; j < m; j++) {
init[i][j] = '.';
}
}
String action = null;
for (int i = 0; i < q; i++) {
action = scanner.nextLine();
String[] actionArray = action.split(" ");
if (actionArray.length == 4) {
int x = Integer.parseInt(actionArray[1]);
int y = Integer.parseInt(actionArray[2]);
char filling = actionArray[3].charAt(0);
fill(init, x, y, filling);
} else {
int x1 = Integer.parseInt(actionArray[1]), y1 = Integer.parseInt(actionArray[2]),
x2 = Integer.parseInt(actionArray[3]), y2 = Integer.parseInt(actionArray[4]);
if (x1 != x2) {
if (x1 > x2) {
int tmp = x1;
x1 = x2;
x2 = tmp;
}
for (int j = x1; j <= x2; j++) {
if (init[y1][j] == '|' || init[y1][j] == '+')
init[y1][j] = '+';
else
init[y1][j] = '-';
}
} else {
if (y1 > y2) {
int tmp = y1;
y1 = y2;
y2 = tmp;
}
for (int j = y1; j <= y2; j++) {
if (init[j][x1] == '-' || init[j][x1] == '+')
init[j][x1] = '+';
else
init[j][x1] = '|';
}
}
}
}
for (int i = n - 1; i >= 0; i--) {
for (int j = 0; j < m; j++) {
System.out.print(init[i][j]);
}
System.out.println();
}
}
static void fill(char[][] currentGraph, int x, int y, char filling) {
currentGraph[y][x] = filling;
if (notLine(x, y + 1, currentGraph, filling)){
fill(currentGraph, x, y + 1, filling);
}
if (notLine(x + 1, y, currentGraph, filling))
fill(currentGraph, x + 1, y, filling);
if (notLine(x, y - 1, currentGraph, filling))
fill(currentGraph, x, y - 1, filling);
if (notLine(x - 1, y, currentGraph, filling))
fill(currentGraph, x - 1, y, filling);
}
static boolean notLine(int x, int y, char[][] currentGraph, char filling) {
return x >= 0 && x <= (m - 1) && y >= 0 && y <= (n - 1) && currentGraph[y][x] != '-'
&& currentGraph[y][x] != '|' && currentGraph[y][x] != '+' && currentGraph[y][x] != filling;
}
}
附上他的c++程序：
问题描述
用 ASCII 字符来画图是一件有趣的事情，并形成了一门被称为 ASCII Art 的艺术。例如，下图是用 ASCII 字符画出来的 CSPRO 字样。
.._._.._.._…_..
././.||...|..../._..
|.|…___.|.|).|.|).|.|.|.|
|.|.).|.._/|...<|.|_|.|
.____|_/||…||._\/.
本题要求编程实现一个用 ASCII 字符来画图的程序，支持以下两种操作：
Ÿ 画线：给出两个端点的坐标，画一条连接这两个端点的线段。简便起见题目保证要画的每条线段都是水平或者竖直的。水平线段用字符 - 来画，竖直线段用字符 | 来画。如果一条水平线段和一条竖直线段在某个位置相交，则相交位置用字符 + 代替。
Ÿ 填充：给出填充的起始位置坐标和需要填充的字符，从起始位置开始，用该字符填充相邻位置，直到遇到画布边缘或已经画好的线段。注意这里的相邻位置只需要考虑上下左右 4 个方向，如下图所示，字符 @ 只和 4 个字符 * 相邻。
.*.
@
.*.
输入格式
第1行有三个整数m, n和q。m和n分别表示画布的宽度和高度，以字符为单位。q表示画图操作的个数。
第2行至第q + 1行，每行是以下两种形式之一：
Ÿ 0 x1 y1 x2 y2：表示画线段的操作，(x1, y1)和(x2, y2)分别是线段的两端，满足要么x1 = x2 且y1 ≠ y2，要么 y1 = y2 且 x1 ≠ x2。
Ÿ 1 x y c：表示填充操作，(x, y)是起始位置，保证不会落在任何已有的线段上；c 为填充字符，是大小写字母。
画布的左下角是坐标为 (0, 0) 的位置，向右为x坐标增大的方向，向上为y坐标增大的方向。这q个操作按照数据给出的顺序依次执行。画布最初时所有位置都是字符 .（小数点）。
输出格式
输出有n行，每行m个字符，表示依次执行这q个操作后得到的画图结果。
样例输入
4 2 3
1 0 0 B
0 1 0 2 0
1 0 0 A
样例输出
AAAA
A–A
样例输入
16 13 9
0 3 1 12 1
0 12 1 12 3
0 12 3 6 3
0 6 3 6 9
0 6 9 12 9
0 12 9 12 11
0 12 11 3 11
0 3 11 3 1
1 4 2 C
样例输出
…………….
…+——–+…
…|CCCCCCCC|…
…|CC+—–+…
…|CC|………
…|CC|………
…|CC|………
…|CC|………
…|CC|………
…|CC+—–+…
…|CCCCCCCC|…
…+——–+…
…………….
评测用例规模与约定
所有的评测用例满足：2 ≤ m, n ≤ 100，0 ≤ q ≤ 100，0 ≤ x < m（x表示输入数据中所有位置的x坐标），0 ≤ y < n（y表示输入数据中所有位置的y坐标）。
题解
仍然是模拟。
需要注意的是，题中的坐标体系和用二维数组表示的坐标体系是不同的，这需要一个映射过程。
<code class="language-c++ hljs cpp has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#include <iostream></span>
<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#include <cstdio></span>
<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#include <string></span>
<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#include <fstream></span>
<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#include <cstring></span>
<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#include <algorithm></span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">using</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">namespace</span> <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">std</span>;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">const</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> maxn = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">105</span>;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">char</span> pic[maxn][maxn];
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> dir[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">4</span>][<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>] = { {-<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>}, {<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>, -<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>}, {<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>}, {<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>} };
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> n, m, q;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> print()
{
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span>(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> i = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>; i < n; ++i){
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span>(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> j = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>; j < m; ++j)
<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">cout</span> << pic[i][j];
<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">cout</span> << endl;
}
}
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> Map(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span>& x, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span>& y)
{
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> t = x;
x = n - <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span> - y;
y = t;
}
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> dfs(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> r, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> c, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">char</span> ch)
{
pic[r][c] = ch;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span>(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> i = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>; i < <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">4</span>; ++i)
{
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> nr = r + dir[i][<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>], nc = c + dir[i][<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>];
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span>(nr < <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span> || nr >= n || nc < <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span> || nc >= m || pic[nr][nc] == <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'-'</span>
|| pic[nr][nc] == ch || pic[nr][nc] == <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'|'</span> || pic[nr][nc] == <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'+'</span>) <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">continue</span>;
dfs(nr, nc, ch);
}
}
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> main()
{
<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#ifdef LOCAL</span>
fstream <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">cin</span>(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"data.in"</span>);
<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#endif <span class="hljs-comment" style="box-sizing: border-box;">// LOCAL</span></span>
<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">cin</span> >> m >> n >> q;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span>(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> i = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>; i < n; ++i){
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span>(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> j = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>; j < m; ++j)
pic[i][j] = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'.'</span>;
}
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">while</span>(q--){
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> op, x1, y1, x2, y2;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">char</span> ch;
<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">cin</span> >> op;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span>(op == <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>)
{
<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">cin</span> >> x1 >> y1 >> x2 >> y2;
Map(x1, y1);
Map(x2, y2);
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span>(x1 == x2){
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span>(y1 > y2) swap(y1, y2);
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span>(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> i = y1; i <= y2; ++i){
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span>(pic[x1][i] == <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'|'</span>) pic[x1][i] = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'+'</span>;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span>(pic[x1][i] != <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'+'</span>) pic[x1][i] = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'-'</span>; <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//'+'不要被覆盖</span>
}
}
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span>{
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span>(x1 > x2) swap(x1, x2);
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span>(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> i = x1; i <= x2; ++i){
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span>(pic[i][y1] == <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'-'</span>) pic[i][y1] = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'+'</span>;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span>(pic[i][y1] != <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'+'</span>) pic[i][y1] = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'|'</span>;
}
}
}
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span>
{
<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">cin</span> >> x1 >> y1 >> ch;
Map(x1, y1);
dfs(x1, y1, ch);
}
}
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span>(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> i = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>; i < n; ++i){
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span>(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> j = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>; j < m; ++j)
<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">cout</span> << pic[i][j];
<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">cout</span> << endl;
}
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>;
}</code>
