UVa 213 Message Decoding

输入部分包含两部分，编码头和一串code，注意序列与编码头的对应关系中，序列有着很强的分段规律性，所以选择二维数组code储存，最后解码时直接输出对应code元素即可。

源码如下

#include<iostream>
#include<cstring>
const int maxn = 80;
char code[8][1 << 8];
void readchar();
int readint(int c);
int main()
{
	using namespace std;
	//int r = readint(3);
	//cout << r;
	readchar();
	//for (int a = 0; a < 1; a++)
	//cout << code[2][a];
	int m;
	while ((m=readint(3)) != 0)
	{
		int j;//necessary?yes
		while ((j = readint(m)) != ((1 << m )- 1))
		{
			cout << code[m-1][j];
		}
	}
	
}
void readchar()
{
	for (int i = 0; i < 8; i++)
		code[i][1 << 8] = {};
	using namespace std;
	char head[maxn];
	cin.getline(head, maxn);
	int len = strlen(head);
	int j = 0, k = 0;
	for (int i = 0; i < len; i++)
	{
		code[j][k] = head[i];
		if ((k + 1) >= (1 << (j + 1)) - 1) { j++; k = 0; }
		else k++;
	}
}
int readint(int c)
{
	using namespace std;
	char ch;
	int ans=0;
	for (int i = 0; i < c; i++)
	{
		while ((ch = cin.get()) == '\n')continue;
		ans += (ch - '0') << (c - i - 1);
	}
	return ans;
}