Data update

Task/Burrows-Wheeler-transform/Sidef/burrows-wheeler-transform-2.sidef

@@ -16,28 +16,9 @@ func bwt_sort (String s) {    # O(n * LOOKAHEAD_LEN) space (fast)
 
 func bwt_encode(String s) {
 
-    var bwt    = bwt_sort(s)
-    var ret    = bwt.map {|i| s.slice(i-1, 1) }.join
-    var prefix = s.slice(0, LOOKAHEAD_LEN)
-    var len    = prefix.len
-
-    var idx = 0;
-    for i in (bwt) {
-
-        var lookahead = s.slice(i, len)
-
-        if (lookahead.len < len) {
-            lookahead += s.slice(0, len - lookahead.len)
-        }
-
-        if (lookahead == prefix) {
-            var row = s.rotate(i)
-            if (row == s) {
-                break
-            }
-        }
-        ++idx
-    }
+    var bwt = bwt_sort(s)
+    var ret = bwt.map {|i| s.slice(i-1, 1) }.join
+    var idx = bwt.first_index_by { .is_zero }
 
     return (ret, idx)
 }