diff --git a/problems/running-sum-of-1d-array.rs b/problems/running-sum-of-1d-array.rs
new file mode 100644
index 0000000..06ea638
--- /dev/null
+++ b/problems/running-sum-of-1d-array.rs
@@ -0,0 +1,8 @@
+impl Solution {
+    pub fn running_sum(nums: Vec<i32>) -> Vec<i32> {
+        nums.iter().scan(0, |s, &x| {
+            *s = *s + x;
+            Some(*s)
+        }).collect()
+    }
+}