A few problems

longest-valid-parentheses/sol.rs

@@ -0,0 +1,19 @@
+// Incomplete
+impl Solution {
+    pub fn longest_valid_parentheses(s: String) -> i32 {
+        if s.len() == 0 { 0 }
+        let mut s = 0;
+        let mut open = 0;
+        let mut acc = 0;
+        for c in s.chars().into_iter() {
+            if c == '(' {
+                open += 1;
+            } else {
+                open -= 1;
+            }
+            if open == 0 {
+
+            }
+        }
+    }
+}