PCK本戦1問目：後になって書いてみた編

pck2012_1.c

#include <stdio.h>

enum {A, X, Y, Z, W, B, ERROR};
int map[6][2] = {
	{X, Y},
	{ERROR, Z},
	{X, ERROR},
	{W, B},
	{B, Y},
	{Y, X}
};

int main(void)
{
	int sw;
	int now_pos;
	
	for (now_pos = A; (sw = getchar()) != '#';){
		if (sw == '\n'){
			puts(now_pos == B ? "Yes" : "No");
			now_pos = A;
			continue;
		}
		if (now_pos == ERROR) continue;
		now_pos = map[now_pos][sw == '1'];
	}
	return (0);
}