ZigZag Conversion题目及解法

本文主要是介绍ZigZag Conversion题目及解法，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

问题描述：

The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fixed font for better legibility)

P   A   H   N
A P L S I I G
Y   I   R

And then read line by line:  "PAHNAPLSIIGYIR"

Write the code that will take a string and make this conversion given a number of rows:

string convert(string text, int nRows);

convert("PAYPALISHIRING", 3)  should return  "PAHNAPLSIIGYIR" .

大致思路，用空间换时间，看每一个字母放第几行，用step控制行数，当遍历完s时，把每一行的字符串连接起来即可得到答案。

代码如下：

if (numRows <= 1)return s;const int len = (int)s.length();string *str = new string[numRows];int row = 0, step = 1;for (int i = 0; i < len; ++i){str[row].push_back(s[i]);if (row == 0)step = 1;else if (row == numRows - 1)step = -1;row += step;}s.clear();for (int j = 0; j < numRows; ++j){s.append(str[j]);}delete[] str;return s;	

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