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Codeforces Round #197 (Div. 2) / 339C Xenia and Weights (爆搜)


http://codeforces.com/contest/339/problem/C


爆搜水过,复杂度貌似是O(m)的?

/*62ms,4KBm*/

#include<cstdio>

int m, ans[1005]; ///ans从1开始
char s[15];
bool ok;

///O(m)复杂度?
int dfs(int deep, int diff) /// diff表示重量之差
{
	if (deep <= m)
		for (int &now = ans[deep] = diff + 1; now <= 10; now++) ///稍微运用下引用
			if (now != ans[deep - 1] && s[now - 1] == '1' && dfs(deep + 1, now - diff))
				return true;
	return ok = (deep > m);
}

int main()
{
	scanf("%s%diff", &s, &m);
	puts(dfs(1, 0) ? "YES" : "NO");
	if (ok) for (int i = 0; i < m; printf("%d ", ans[++i]));
	return 0;
}


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