Merge pull request matthewsamuel95#77 from skydans/subset_sum

Added recursive solution for subset sum

Author: matthewsamuel95

Math/subset_sum/subset_sum.cc

@@ -0,0 +1,28 @@
+#include<bits/stdc++.h>
+using namespace std;
+vector<int> v;
+int n,i,j,k,sum;
+
+bool is_subset_sum(int m,int sum){
+	if(sum==0)return true;
+	if(m==0 && sum!=0)return false;
+	if(v[m-1]>sum)return is_subset_sum(m-1,sum);
+	return is_subset_sum(m-1,sum)||is_subset_sum(m-1,sum-v[m-1]);
+}
+
+int main(){
+	n=6;
+	v.push_back(3);
+	v.push_back(34);
+	v.push_back(4);
+	v.push_back(12);
+	v.push_back(5);
+	v.push_back(2);
+	sum=9;
+	if(is_subset_sum(n,sum)){
+		cout<<"found\n";
+	}else{
+		cout<<"not found\n";
+	}
+	return 0;
+}