Create 2309.-Greatest-English-Letter-in-Upper-and-Lower-Case.java

Contest 298 problem 1

Author: SharmaTushar1

java/2309.-Greatest-English-Letter-in-Upper-and-Lower-Case.java

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+//Contest 298 brute-force feel free to share any improvements
+class Solution {
+    public String greatestLetter(String s) {
+        HashSet<Integer> set = new HashSet<>();
+        int ans = -1;
+        for (int i = 0; i<s.length(); i++) {
+            if (set.contains((s.charAt(i)-32)) || set.contains((s.charAt(i)+32))) 
+                ans = Math.max(ans, (int)Character.toUpperCase(s.charAt(i)));
+            set.add(0+s.charAt(i));
+        }
+        return ans==-1?"":(char)ans+"";
+    }
+}