Merge pull request #2892 from benmak11/0168-excel-sheet-column-title

Create 0168-excel-sheet-column-title

Author: a93a

java/0168-excel-sheet-column-title.java

@@ -0,0 +1,21 @@
+class Solution {
+    public String convertToTitle(int columnNumber) {
+        Map<Integer, Character> map = new HashMap<>();
+        char c = 'A';
+
+        for (int i = 1; i <= 26; i++) {
+            map.put(i, c);
+            c++;
+        }
+
+        StringBuilder res = new StringBuilder();
+
+        while (columnNumber > 0) {
+            int r = (columnNumber - 1) % 26;
+            res.insert(0, map.get(r + 1));
+            columnNumber = (columnNumber - 1) / 26;
+        }
+
+        return res.toString();
+    }
+}