UVa 213 Message Decoding

#include<cstdio>
#include<cstring>
using namespace std;
int readchar() {//读入字符，并且过滤开头回车或换行
	for (;;) {
		int ch = getchar();
		if (ch != ‘\n‘ && ch != ‘\r‘) 
			return ch;
	}
}
int readint(int c) {//计算二进制大小
	int v = 0;
	while (c--) {
		v = v * 2 + readchar() - ‘0‘;
	}
	return v;
}
int code[8][1 << 8];//1 << 8相当于1*2^8, [x][y]表示长度为y(长度为x)的字符
bool readcodes() {//读入数据，并且判断是否读入成功
	memset(code, 0, sizeof(code));
	code[1][0] = readchar();
	for (int len = 2; len <= 7; ++len) {
		for (int i = 0; i < (1 << len) - 1; ++i) {
			int ch = getchar();
			if (ch == EOF) return false;//读到文件结束，说明读入失败
			if (ch == ‘\n‘ || ch == ‘\r‘) return true;//读到换行或回车说明读入成功
			code[len][i] = ch;
		}
	}
	return true;
}
int main() {
	while (readcodes()) {
		for (;;) {
			int len = readint(3);
			if (len == 0) break;
			for (;;) {
				int v = readint(len);
				if (v == (1 << len) - 1) break;//全1时退出
				putchar(code[len][v]);
			}
		}
		putchar(‘\n‘);
	}
	return 0;
}