UVa 489 Hangman Judge

#include<iostream>
#include<cstdio>
#include<cstring>
using namespace std;
int main () {
	int times;
	while (scanf("%d", &times) == 1 && times != -1) {
		char s[100];
		int a[26] = {0}, b[26] = {0};
		scanf("%s", s);
		int len = strlen(s);
		for (int i = 0; i != len; ++i) 
			a[s[i] - ‘a‘] = 1;
		scanf("%s", s);
		len = strlen(s);
		int cnt = 0;
		bool flag = false;
		for (int i = 0; i != len; ++i) {
			if (!a[s[i] - ‘a‘]) {
				if (++cnt >= 7) {
					printf("Round %d\nYou lose.\n", times);
					flag = true;
					break;
				}
			}
			else {
				a[s[i] - ‘a‘] = -1;
				bool ok = true;
				for (int j = 0; j != 26; ++j) {
					if (a[j] == 1) {
						ok = false;
						break;
					}
				}
				if (ok) {
					printf("Round %d\nYou win.\n", times);
					flag = true;
					break;
				}
			}				
		}
		if (!flag) 
		printf("Round %d\nYou chickened out.\n", times);
	}
	return 0;
}