leetcode

0 class Solution {

1 public:

2 string convert(string s, int numRows) {

3 if (numRows == 1) return s;

4 vector<string> mat(numRows);

5

6 int mode = 1, x = 0;

7 for (char c : s) {

8 mat[x].push_back(c);

9 x += mode;

10 if (x == numRows - 1 || x == 0) mode *= -1;

11 }

12

13 string res = "";

14 for (const auto &r : mat)

15 res += r;

16 return res;

17 }

18 };