Added a new question combination sum iii

codes/cpp/combination_sum_iii.cpp

@@ -0,0 +1,41 @@
+#include <iostream>
+#include<vector>
+using namespace std;
+
+void findProperSubSet(int k,int n,vector<vector<int>>&ans,vector<int>&partAns,int l){
+        if(k==0&&n<0)
+            return;
+        if(k==0&&n==0){
+            ans.push_back(partAns);
+            return;
+        }
+        if(k==0&&n>0)
+            return;
+        for(int i=l;i<=9;i++){
+            partAns.push_back(i);
+            findProperSubSet(k-1,n-i,ans,partAns,i+1);
+            partAns.pop_back();
+        }
+
+    }
+vector<vector<int>> combinationSum3(int k, int n) {
+        vector<vector<int>>ans;
+        vector<int>partAns;
+        findProperSubSet(k,n,ans,partAns,1);
+        return ans;
+}
+int main()
+{
+    int k,n;
+    cin>>k;
+    cin>>n;
+    vector<vector<int>>ans=combinationSum3(k,n);
+    for(int i=0;i<ans.size();i++){
+        for(int j=0;j<k;j++){
+            cout<<ans[i][j];
+        }
+        cout<<""<<endl;
+    }
+
+    return 0;
+}