Add example inputs

examples/subset_sum/subset_sum.mc

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+bool is_subset_sum(int[20] arr, int sum, int arr_size)
+{
+    if (sum == 0) {
+        return true;
+    }
+    if (arr_size == 0) {
+        return false;
+    }
+    if (arr[arr_size-1] > sum) {
+        return is_subset_sum(arr, sum, arr_size-1);
+    }
+    return is_subset_sum(arr, sum, arr_size-1) ||
+            is_subset_sum(arr, sum-arr[arr_size-1], arr_size-1);
+}
+
+int main()
+{
+    int n;
+    int[20] arr;
+    int sum;
+    n = 0;
+    while (n < 20) {
+        arr[n] = n;
+        n = n + 1;
+    }
+    print("Problem: Given the array [1, 2, ..., 20] and a natural number n");
+    print_nl();
+    print("is there a subset of the array which sum is equals to n?");
+    print_nl();
+    print("Input: n = ");
+    sum = read_int();
+    print_nl();
+    if (is_subset_sum(arr, sum, n+1)) {
+        print("Subset found with given sum!");
+    }
+    else {
+        print("No subset found with given sum!");
+    }
+    print_nl();
+
+    return 0;
+}

examples/subset_sum/subset_sum.stdin.txt

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+22

examples/subset_sum/subset_sum.stdout.txt

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+Problem: Given the array [1, 2, ..., 20] and a natural number n
+is there a subset of the array which sum is equals to n?
+Input: n = 
+Subset found with given sum!