Count of Subset Sum.cpp

Author: KrishnaRA03

Count of Subset Sum.cpp

@@ -0,0 +1,40 @@
+#include <bits/stdc++.h>
+using namespace std;
+#define int long long int
+#define fast                    \
+    cin.sync_with_stdio(false); \
+    cin.tie(NULL);              \
+    cout.tie(NULL);
+
+int dp[1001][10001];
+int CountOfSubsetSum(int n, int arr[], int sum)
+{
+    for (int i = 0; i <= n; i++)
+        dp[i][0] = 1;
+    for (int i = 1; i <= sum; i++)
+        dp[0][i] = 0;
+    for (int i = 1; i <= n; i++)
+    {
+        for (int j = 1; j <= sum; j++)
+        {
+            if (arr[i - 1] <= j)
+                dp[i][j] = dp[i - 1][j - arr[i - 1]] + dp[i - 1][j];
+            else
+                dp[i][j] = dp[i - 1][j];
+        }
+    }
+    return dp[n][sum];
+}
+signed main()
+{
+    fast;
+    int n = 4;
+    int arr[4] = {1, 2, 3, 3};
+    int sum = 6;
+    //memonization
+    memset(dp, -1, sizeof(dp));
+
+    cout << CountOfSubsetSum(n, arr, sum);
+
+    return 0;
+}