Adding 678-Valid-Parenthesis-String.c

Gyanachand1 · Aug 24, 2022 · 662dca4 · 662dca4
1 parent 1972d20
commit 662dca4
Showing 1 changed file with 35 additions and 0 deletions.
diff --git a/c/678-Valid-Parenthesis-String.c b/c/678-Valid-Parenthesis-String.c
@@ -0,0 +1,35 @@
+/*
+ Time: O(n)
+ Space: O(1)
+*/
+
+bool checkValidString(char * s) {
+ int n = strlen(s);
+
+ int balanced = 0;
+ for (int i=0; i<n; i++) {
+ if (s[i] == '(' || s[i] == '*') 
+ balanced++;
+ else 
+ balanced--;
+
+ if (balanced < 0) 
+ return false;
+ }
+
+ if (balanced == 0) 
+ return true;
+
+ balanced = 0;
+ for (int i=n-1; i>=0; i--) {
+ if (s[i] == ')' || s[i] == '*') 
+ balanced++;
+ else 
+ balanced--;
+
+ if (balanced < 0) 
+ return false;
+ }
+
+ return true;
+}