A few problems

maximum-subarray/sol.rs

@@ -0,0 +1,10 @@
+impl Solution {
+    pub fn max_sub_array(nums: Vec<i32>) -> i32 {
+        nums.iter()
+            .fold((nums[0], 0), |(max, sum), n| {
+                let new_sum = sum + n;
+                (max.max(new_sum), 0.max(new_sum))
+            })
+            .0
+    }
+}