Equal Subset Problem

Problems and General Algos/EqualSubset.cpp

@@ -0,0 +1,50 @@
+/*
+Problem: To check if an array can be divided into two subarrays of equal sum
+*/
+
+#include<bits/stdc++.h>
+using namespace std;
+bool canPartition(vector<int>& nums) {
+        int sum = 0;
+        for(int i=0;i<nums.size();i++)
+            sum+=nums[i];
+        if(sum%2==1)
+            return false;
+        sum/=2;
+        //Find subset sum 
+        bool arr[201][20001]={0};//Assumed a max size
+        int i=0,j=0;
+        for(i=0;i<=nums.size();i++)
+        {
+            arr[i][0]=1;
+        }
+        for(i=1;i<=nums.size();i++)
+        {
+            for(j=1;j<=sum;j++)
+            {
+                if(nums[i-1]<=j)
+                {
+                    arr[i][j]=((arr[i-1][j-nums[i-1]]) ||(arr[i-1][j]));
+                }
+                else
+                    arr[i][j] = arr[i-1][j];
+            }
+        }
+
+        return bool(arr[nums.size()][sum]);
+    }
+int main()
+{
+    int n;
+    cin>>n;
+    vector<int>vec(n);
+    for(int i=0;i<n;i++)
+        cin>>vec[i];
+    if(canPartition(nums))
+        cout<<"This array can be divided into 2 subarrays of equal sum"<<endl;
+    else
+    {
+        cout<<"Partition not possible"<<endl;
+    }
+    return 0;
+}