Create second-largest-digit-in-a-string.cpp

Author: kamyu104

C++/second-largest-digit-in-a-string.cpp

@@ -0,0 +1,22 @@
+// Time:  O(n)
+// Space: O(1)
+
+class Solution {
+public:
+    int secondHighest(string s) {
+        int first = -1, second = -1;
+        for (const auto& c : s) {
+            if (!isdigit(c)) {
+                continue;
+            }
+            int d = c - '0';
+            if (d > first) {
+                second = first;
+                first = d;
+            } else if (first > d && d > second) {
+                second = d;
+            }
+        }
+        return second;
+    }
+};