Given a rows x cols screen and a sentence represented as a list of strings, return the number of times the given sentence can be fitted on the screen.

The order of words in the sentence must remain unchanged, and a word cannot be split into two lines. A single space must separate two consecutive words in a line.

 

Example 1:

Input: sentence = ["hello","world"], rows = 2, cols = 8
Output: 1
Explanation:
hello---
world---
The character '-' signifies an empty space on the screen.

Example 2:

Input: sentence = ["a", "bcd", "e"], rows = 3, cols = 6
Output: 2
Explanation:
a-bcd- 
e-a---
bcd-e-
The character '-' signifies an empty space on the screen.

Example 3:

Input: sentence = ["i","had","apple","pie"], rows = 4, cols = 5
Output: 1
Explanation:
i-had
apple
pie-i
had--
The character '-' signifies an empty space on the screen.

 1 public class Solution {
 2     public int wordsTyping(String[] sentence, int rows, int cols) {
 3         String s = String.join("_", sentence) + "_";
 4         int len = s.length();
 5         int count = 0;
 6         int[] map = new int[len];
 7         for (int i = 1; i < len; ++i) {
 8             // if charAt(i) == '_', which means we saved an extra space
 9             map[i] = s.charAt(i) == '_' ? 1 : map[i-1] - 1;
10         }
11         for (int i = 0; i < rows; ++i) {
12             count += cols;
13             count += map[count % len];
14         }
15         return count / len;
16     }
17 }

 1     public int wordsTyping(String[] sentence, int rows, int cols) {
 2         String s = String.join(" ", sentence) + " ";
 3         int start = 0;
 4         int length = s.length();
 5         for (int i = 0; i < rows; i++) {
 6             start += cols;
 7             if (s.charAt(start % length) == ' ') {
 8                 start++;
 9             } else {
10                 while (start >= 0 && s.charAt(start % length) != ' ') {
11                     start--;
12                 }
13                 start++;
14             }
15         }
16         
17         return start / length;
18     }