题目链接:http://codeforces.com/contest/610/problem/C

解题思路:

将后一个矩阵拆分为四个前一状态矩阵,其中三个与前一状态相同,剩下一个直接取反就行。还有很多种取法,这种比较方便就是。

实现代码:

#include<iostream>
#include<string>
#include<cmath>
using namespace std;
int a[][],b[][];
int main()
{
int n;
cin>>n;
int k = ,t1=,t0=,i,j;
while(k<=n){
k++; t1=<<(k); t0=<<(k-);
b[][] = ;
for(i=;i<=t0;i++)
for(j=;j<=t0;j++)
b[i][j] = b[t0+i][j]=b[i][j+t0]=a[i][j];
for(i=;i<=t0;i++)
for(j=;j<=t0;j++)
b[i+t0][j+t0]= - a[i][j];
for(i=;i<=t1;i++)
for(j=;j<=t1;j++)
a[i][j] = b[i][j]; }
for(i=;i<=(<<n);i++){
for(j=;j<=(<<n);j++){
if(a[i][j]==)
cout<<"+";
else cout<<"*";
}
cout<<endl;
}
return ;
}

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