finish 'Longest Substring Without Repeating Characters'

tags/string/longestSubstringWithoutRepeatingCharacters/main.go

@@ -54,7 +54,7 @@ func lengthOfLongestSubstring(s string) int {
 		if i-cursor > maxCount {
 			maxCount = i - cursor
 		}
-		cursor++
+		cursor = record[s[i]] + 1
 		record[s[i]] = i
 
 	}