diff --git a/01背包.cpp b/01背包.cpp
new file mode 100644
index 0000000..4fefcc4
--- /dev/null
+++ b/01背包.cpp
@@ -0,0 +1,40 @@
+#include <iostream>
+#include <vector>
+#include <algorithm>
+
+using namespace std;
+
+class Solution {
+public:
+    int knapsack(int V, vector<vector<int>>& vw) {
+        sort(vw.begin(),vw.end(),[](vector<int> a,vector<int> b){
+        	return a[0] < b[0];			
+		});
+		
+		vector<vector<int>> dp(vw.size() + 1,vector<int>(V + 1,0));
+		
+		for(int i = 1 ;i <= vw.size();i++){
+			for(int j = 1;j < vw[i-1][0];j++){
+				dp[i][j] = dp[i-1][j];
+				//cout << dp[i][j] << " ";
+			}
+			//cout << "change";
+			for(int j = vw[i-1][0];j <= V;j++){
+				dp[i][j] = max(dp[i-1][j],vw[i-1][1] + dp[i-1][j - vw[i-1][0]]);
+				cout << dp[i][j] << ":" << j << " ";
+			}
+			//cout << endl;
+		}
+		
+        return dp[vw.size()][V];
+        
+    }
+};
+
+int main(){
+	Solution mysolution;
+	vector<vector<int>> array = {{1,3},{10,4}};
+	
+	cout << mysolution.knapsack(10,array);
+	return 0; 
+}
diff --git a/PrintMinNumber.cpp b/PrintMinNumber.cpp
new file mode 100644
index 0000000..f0b1344
--- /dev/null
+++ b/PrintMinNumber.cpp
@@ -0,0 +1,28 @@
+#include <iostream>
+#include <vector>
+#include <list>
+#include <string> 
+#include <algorithm>
+
+using namespace std;
+
+class Solution {
+public:
+    string PrintMinNumber(vector<int>& numbers) {
+		sort(numbers.begin(),numbers.end(),[](int a,int b){
+			return stoi(to_string(a) + to_string(b)) < stoi(to_string(b) + to_string(a));
+		});
+		string result = "";
+		for(auto &i:numbers){
+			result += to_string(i);
+		}
+		return result;
+	}
+};
+
+int main(){
+    vector<int> nums = {3,33,3334,33332};
+    Solution solution;
+    cout << solution.PrintMinNumber(nums) << endl;
+    return 0;
+}