https://leetcode.com/problems/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 s, int numRows);
Example 1:
Input: s = "PAYPALISHIRING", numRows = 3 Output: "PAHNAPLSIIGYIR"
Example 2:
Input: s = "PAYPALISHIRING", numRows = 4 Output: "PINALSIGYAHRPI" Explanation: P I N A L S I G Y A H R P I
代码：
class Solution {
public:
string convert(string s, int nRows) {
if (nRows <= 1) return s;
string res = "";
int size = 2 * nRows - 2;
for (int i = 0; i < nRows; ++i) {
for (int j = i; j < s.size(); j += size) {
res += s[j];
int tmp = j + size - 2 * i;
if (i != 0 && i != nRows - 1 && tmp < s.size()) res += s[tmp];
}
}
return res;
}
};
找规律找到每个字符在新的字符串中的位置