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String6.java
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76 lines (74 loc) · 2.1 KB
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package string;
import java.util.List;
/**
* @ProjectName: leetcode
* @Package: string
* @ClassName: String6
* @Author: markey
* @Description:6. Z 字形变换
* 将一个给定字符串根据给定的行数,以从上往下、从左到右进行 Z 字形排列。
*
* 比如输入字符串为 "LEETCODEISHIRING" 行数为 3 时,排列如下:
*
* L C I R
* E T O E S I I G
* E D H N
* 之后,你的输出需要从左往右逐行读取,产生出一个新的字符串,比如:"LCIRETOESIIGEDHN"。
*
* 请你实现这个将字符串进行指定行数变换的函数:
*
* string convert(string s, int numRows);
* 示例 1:
*
* 输入: s = "LEETCODEISHIRING", numRows = 3
* 输出: "LCIRETOESIIGEDHN"
* 示例 2:
*
* 输入: s = "LEETCODEISHIRING", numRows = 4
* 输出: "LDREOEIIECIHNTSG"
* 解释:
*
* L D R
* E O E I I
* E C I H N
* T S G
*
* 来源:力扣(LeetCode)
* 链接:https://leetcode-cn.com/problems/zigzag-conversion
* 著作权归领扣网络所有。商业转载请联系官方授权,非商业转载请注明出处。
* @Date: 2020/4/27 22:29
* @Version: 1.0
*/
public class String6 {
public String convert(String s, int numRows) {
if (numRows == 1) {
return s;
}
boolean direction = true; // ture表示向下读取
int row = 0; // 表示当前行数
StringBuilder[] sbs = new StringBuilder[numRows];
for (int i = 0; i < sbs.length; i++) {
sbs[i] = new StringBuilder();
}
// 需要读取n个字符
for (int i = 0; i < s.length(); i++) {
sbs[row].append(s.charAt(i));
if (row == 0) {
direction = true;
}
if (row == numRows-1) {
direction = false;
}
if (direction) {
row++;
} else {
row--;
}
}
StringBuilder res = new StringBuilder();
for (int i = 0; i < sbs.length; i++) {
res.append(sbs[i]);
}
return res.toString();
}
}