418 Sentence Screen Fitting

418. Sentence Screen Fitting​
1. Question
Given arows x colsscreen and a sentence represented by a list of non-empty words, find how many times the given sentence can be fitted on the screen.
Note:
1.A word cannot be split into two lines.
2.The order of words in the sentence must remain unchanged.
3.Two consecutive words in a line must be separated by a single space.
4.Total words in the sentence won't exceed 100.
5.Length of each word is greater than 0 and won't exceed 10.
6.1 ≤ rows, cols ≤ 20,000.
Example 1:
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Input: rows = 2, cols = 8, sentence = ["hello", "world"]
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​
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Output: 1
4
​
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Explanation:
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hello---
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world---
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​
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The character '-' signifies an empty space on the screen.
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Example 2:
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Input: rows = 3, cols = 6, sentence = ["a", "bcd", "e"]
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Output: 2
4
​
5
​
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Explanation:
7
a-bcd- 
8
e-a---
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bcd-e-
10
​
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The character '-' signifies an empty space on the screen.
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Example 3:
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Input: rows = 4, cols = 5, sentence = ["I", "had", "apple", "pie"]
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​
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Output: 1
4
​
5
​
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Explanation:
7
I-had
8
apple
9
pie-I
10
had--
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​
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The character '-' signifies an empty space on the screen.
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2. Implementation
思路: 这道题是给定一个每个单词以空格隔开的句子，要求用多少这个句子才能完全fit上 row * col的screen, 一个单词不能分布在不同的两行。所以我们先得到这个句子用空格隔开后的长度len，然后用start这个变量判断每行最后一个空格在哪，最后的结果就是start / len
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class Solution {
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    public int wordsTyping(String[] sentence, int rows, int cols) {
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        String s = "";
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​
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        for (String word : sentence) {
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            s += word + " ";
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        }
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​
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        int len = s.length();
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        int start = 0;
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​
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        for (int i = 0; i < rows; i++) {
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            start += cols;
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            if (s.charAt(start % len) == ' ') {
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                ++start;
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            }
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            else {
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                while (start > 0 && s.charAt((start - 1) % len) != ' ') {
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                    --start;
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                }
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            }
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        }
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        return start / len;
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    }
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}
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3. Time & Space Complexity
时间复杂度O(n), 空间复杂度O(n)

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Contents

418. Sentence Screen Fitting

1. Question

2. Implementation

3. Time & Space Complexity

418. Sentence Screen Fitting​

1. Question

2. Implementation

3. Time & Space Complexity

418. Sentence Screen Fitting