diff --git a/DP/RangeSumQueryImmutable.swift b/DP/RangeSumQueryImmutable.swift
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+++ b/DP/RangeSumQueryImmutable.swift
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+/**
+ * Question Link: https://leetcode.com/problems/range-sum-query-immutable/
+ * Primary idea: Calculate the sum of the elements of nums between indices left and right
+ * Time Complexity: O(n), Space Complexity: O(1)
+ *
+ */
+
+class NumArray {
+	var sums: [Int] = []
+
+	init(_ nums: [Int]) {
+		var currentSum = 0
+
+		for num in nums {
+			currentSum += num
+			sums.append(currentSum)
+		}
+		print(sums)
+	}
+
+	func sumRange(_ left: Int, _ right: Int) -> Int {
+		if left == 0 {
+			return sums[right]
+		}
+		return sums[right] - sums[left-1]
+	}
+}