[LeetCode] Text Justification

leo524891010

于 2013-01-23 13:36:56 发布

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分类专栏： Leetcode

本文链接：https://blog.youkuaiyun.com/algorithmengine/article/details/8533771

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本文介绍了一种文本段落美化算法的实现方法，该算法能够将输入的一系列单词按照指定的行宽进行合理布局，使得段落内的文字既美观又符合阅读习惯。通过计算每个单词之间的空格数来达到均匀分布的目的，特别处理了最后一行左对齐的特殊情况。

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class Solution {
public:
    vector<string> fullJustify(vector<string> &words, int l) {
        // Start typing your C/C++ solution below
        // DO NOT write int main() function
        vector<string> res;
        if (words.size() == 0 || l < 0) return res;
        
        int begin = 0;
        while (begin < words.size())
        {
            int idx = begin;
            int curSize = 0;
            while (idx < words.size())
            {
                int tempSize = curSize == 0 ? words[idx].size() : curSize + words[idx].size() + 1;
                if (tempSize <= l)
                    curSize = tempSize;
                else 
                    break;
                ++idx;
            }
            
            int end = idx - 1;
            
            int eachGapSpace = 0;
            int remainSpace = l - curSize;
            string line = "";
            if (end - begin != 0 && end != words.size() - 1)
            {
                eachGapSpace = remainSpace / (end - begin);
                remainSpace %= (end - begin);
            }
            else
            {
                eachGapSpace = 0;
            }
            
            for (int i = begin; i <= end; ++i)
            {
                if (i == begin)
                    line = words[i];
                else
                {
                    line += " ";
                    
                    for (int j = 0; j < eachGapSpace; ++j)
                        line += " ";
                        
                    if (remainSpace > 0 && end != words.size() - 1)
                    {
                        line += " ";
                        --remainSpace;
                    }                    
                    line += words[i];
                }
            }
            
            while (remainSpace > 0)
            {
                line += " ";
                --remainSpace;
            }

            
            res.push_back(line);
            
            begin = end + 1;

        }
        return res;
    }
};