delete pics to save space

7.1011.cpp

@@ -0,0 +1,48 @@
+#include<cstdio>
+#include<cstring>
+#include<algorithm>
+using namespace std;
+int n,cnt[100],tot;
+bool dfs(int lst,int s,int goal,int maxlen)
+{
+//	printf("(%d,%d,%d,%d)\n",lst,s,goal,maxlen);
+	if(lst==0) return true;
+	if(s==goal) return dfs(lst-1,0,goal,50);
+	for(int i=maxlen;i>=1;i--) if(cnt[i]&&i+s<=goal)
+	{
+		cnt[i]--;
+		if(dfs(lst,s+i,goal,i)) { cnt[i]++; return true; }
+		cnt[i]++;
+		if(s==0||s+i==goal) return false;
+	}
+	return false;
+}
+inline bool check(int len)
+{
+	return dfs(tot/len,0,len,50);
+}
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	while(scanf("%d",&n),n)
+	{
+		tot=0; memset(cnt,0,sizeof(cnt));
+		for(int i=0;i<n;i++)
+		{
+			int x; scanf("%d",&x);
+			++cnt[x]; tot+=x;
+		}
+		int res=tot;
+		for(int i=1;i*i<=tot;i++) if(tot%i==0)
+		{
+			if(check(i))
+			{ printf("%d\n",i); goto nxt; }
+			if(check(tot/i)) res=tot/i;
+		}
+		printf("%d\n",res);
+		nxt:;
+	}
+	return 0;
+}