delete pics to save space

history_source/挑战程序设计竞赛/2.1.4.1.cpp

@@ -0,0 +1,27 @@
+#include<cstdio>
+int a[22],n,k;
+bool dfs(int i,int sum)
+{
+	if(i==n) return sum==k;
+	if(dfs(i+1,sum)) return 1;
+	if(dfs(i+1,sum+a[i])) return 1;
+	return 0;
+}
+void init()
+{
+	int i;
+	scanf("%d",&n);
+	for(i=0;i<n;i++) scanf("%d",a+i);
+	scanf("%d",&k);
+}
+void solve()
+{
+	if(dfs(0,0)) printf("Yes\n");
+	else printf("No\n");
+}
+int main()
+{
+	init();
+	solve();
+	return 0;
+}