Sentence Screen Fitting-蒲公英云

Sentence Screen Fitting

Given a rows x cols screen and a sentence represented by a list of words, find how many times the given sentence can be fitted on the screen.

Note:

A word cannot be split into two lines.
The order of words in the sentence must remain unchanged.
Two consecutive words in a line must be separated by a single space.
Total words in the sentence won’t exceed 100.
Length of each word won’t exceed 10.
1 ≤ rows, cols ≤ 20,000.

Example 1:

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

Example 2:

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

Example 3:

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

统计加空格的句子总长度，然后遍历每一行，初始化colsRemaining为cols，然后还需要一个变量idx，来记录当前单词的位置，如果colsRemaining大于0，就进行while循环，如果当前单词的长度小于等于colsRemaining，说明可以放下该单词，那么就减去该单词的长度就是剩余的空间，然后如果此时colsRemaining仍然大于0，则减去空格的长度1，然后idx自增1，如果idx此时超过单词个数的范围了，说明一整句可以放下，那么就有可能出现宽度远大于句子长度的情况，所以我们加上之前放好的一句之外，还要加上colsRemaining/len的个数，然后colsRemaining%len是剩余的位置，此时idx重置为0.

1 class Solution {
 2     int wordsTyping(String[] sentence, int rows, int cols) {
 3         String all = "";
 4         for (String word : sentence) {
 5             all += (word + " ");
 6         }
 7         int res = 0, idx = 0, n = sentence.length, len = all.length();
 8         for (int i = 0; i < rows; ++i) {
 9             int colsRemaining = cols;
10             while (colsRemaining > 0) {
11                 if (sentence[idx].length() <= colsRemaining) {
12                     colsRemaining -= sentence[idx].length();
13                     if (colsRemaining > 0) {
14                         colsRemaining -= 1;
15                     }
16                     if (++idx >= n) {
17                         res += (1 + colsRemaining / len);
18                         colsRemaining %= len;
19                         idx = 0;
20                     }
21                 } else {
22                     break;
23                 }
24             }
25         }
26         return res;
27     }
28 }