LeetCode 6. ZigZag Conversion

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".

 1 class Solution {
 2 public:
 3     string convert(string s, int numRows) {
 4         if(numRows <= 1) return s;
 5         string res;
 6         int size = 2 * numRows - 2;
 7         for(int i = 0; i < numRows; ++ i)
 8         {
 9             for(int j = i; j < s.size(); j += size)
10             {
11                 res += s[j];
12                 int tmp = j + size - 2 * i;
13                 if(i != 0 && i != numRows - 1 && tmp < s.size())
14                     res += s[tmp];
15             }
16         }
17         return res;
18     }
19 };

参考：http://www.cnblogs.com/springfor/p/3889414.html

posted @ 2017-10-25 15:58  cp_cnblogs  阅读(113)  评论(0)  编辑  收藏  举报