diff --git a/running-sum-of-1d-array/sol.rs b/running-sum-of-1d-array/sol.rs
new file mode 100644
index 0000000..0aa1436
--- /dev/null
+++ b/running-sum-of-1d-array/sol.rs
@@ -0,0 +1,10 @@
+impl Solution {
+    pub fn running_sum(nums: Vec<i32>) -> Vec<i32> {
+        nums.iter()
+            .scan(0, |acc, n| {
+                *acc += n;
+                Some(*acc)
+            })
+            .collect()
+    }
+}
\ No newline at end of file