【LeetCode】LeetCode——第6题：ZigZag Conversion

6. ZigZag Conversion

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Total Accepted: 84774 Total
Submissions: 354945 Difficulty: Easy

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"

.

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题目的大概意思是：给定一个字符串，按照之字形的扫描方式重新排列成新的字符串。

这道题难度等级：简单

要解这道题，我们需要做的就是找规律，规律如下：



因此，就可以解决题目了，代码如下 ：

class Solution {
public:
string convert(string s, int numRows) {
if (numRows == 1){
return s;
}
string str;
int pos = 0;
for (int i = 0; i < numRows; ++i){						//hang
for (int j = 0; j < s.length() / (2 * numRows - 2) + 2; ++j){			//lie
pos = 2 * j * (numRows - 1) + i;
int pos2 = pos - 2 * i;
if (pos2 >= 0 && pos2 < s.length() && i != 0 && i != numRows - 1){
str.push_back(s[pos2]);
}
if (pos < s.length()){
str.push_back(s[pos]);
}
}
}
return str;
}
};

提交后顺利AC掉该题，Runtime: 20
ms。