POJ-2083 Fractal-X星阵图
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Fractal
Time Limit: 1000MS Memory Limit: 30000KTotal Submissions: 8060 Accepted: 3862
Description
A fractal is an object or quantity that displays self-similarity, in a somewhat technical sense, on all scales. The object need not exhibit exactly the same structure at all scales, but the same "type" of structures must appear on all scales.
A box fractal is defined as below :
Your task is to draw a box fractal of degree n.
A box fractal is defined as below :
- A box fractal of degree 1 is simply
X - A box fractal of degree 2 is
X X
X
X X - If using B(n - 1) to represent the box fractal of degree n - 1, then a box fractal of degree n is defined recursively as following
B(n - 1) B(n - 1) B(n - 1)B(n - 1) B(n - 1)
Your task is to draw a box fractal of degree n.
Input
The input consists of several test cases. Each line of the input contains a positive integer n which is no greater than 7. The last line of input is a negative integer −1 indicating the end of input.
Output
For each test case, output the box fractal using the 'X' notation. Please notice that 'X' is an uppercase letter. Print a line with only a single dash after each test case.
Sample Input
1234-1
Sample Output
X-X X XX X-X X X X X XX X X X X X X X XX X X X X XX X X X-X X X X X X X X X X X XX X X X X X X X X X X X X X X X X XX X X X X X X X X X X XX X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X XX X X X X X X X X X X XX X X X X X X X X X X X X X X X X XX X X X X X X X X X X XX X X X X X X X-
Source
Shanghai 2004 Preliminary
#include<iostream>#include<stdio.h>#include<cstring>#include<string>using namespace std;char maps[1000][1000];int n;void dfs(int n,int x,int y){ if(n==1) maps[x][y]='X'; else { if(n-1) { int size=1; for(int i=2; i<n; i++) size*=3; dfs(n-1,x,y);//左上方n-1度 dfs(n-1,x+size*2,y);//右上方n-1度 dfs(n-1,x,y+size*2);//中间n-1度 dfs(n-1,x+size,y+size);//左下方n-1度 dfs(n-1,x+size*2,y+size*2);//右下方n-1度 } }}int main(){ while(~scanf("%d",&n) && n!=-1) { int size=1,i,j; for(i=1; i<n; i++) size*=3; for(i=0; i<size; i++) { for(j=0; j<size; j++) maps[i][j]=' '; maps[i][size]='\0'; } dfs(n,0,0); for(i=0; i<size; i++) printf("%s\n",maps[i]); printf("-\n"); } return 0;}
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