delete pics to save space

2.1374.cpp

@@ -0,0 +1,35 @@
+#include<cstdio>
+#include<algorithm>
+using namespace std;
+int n;
+int a[1005];
+bool dfs(int d,int maxd)
+{
+	if(d>maxd) return false;
+	if(a[d]==n) return true;
+	int maxn=0;
+	for(int i=0;i<d+1;i++) maxn=max(maxn,a[i]);
+	if((maxn<<(maxd-d))<n) return false;
+	for(int i=d;i>=0;i--)
+	{
+		a[d+1]=a[d]+a[i];
+		if(dfs(d+1,maxd)) return true;
+		a[d+1]=a[d]-a[i];
+		if(dfs(d+1,maxd)) return true;
+	}
+	return false;
+}
+int solve()
+{
+	a[0]=1;
+	for(int i=0;i<=1005;i++)
+		if(dfs(0,i)) return i;
+}
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	while(scanf("%d",&n)==1&&n) printf("%d\n",solve());
+	return 0;
+}