leet-code/src/main/java/leetcode/editor/cn/ZigzagConversion.java
2021-06-07 10:16:24 +08:00

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//将一个给定字符串 s 根据给定的行数 numRows ,以从上往下、从左到右进行 Z 字形排列。
//
// 比如输入字符串为 "PAYPALISHIRING" 行数为 3 时,排列如下:
//
//
//P A H N
//A P L S I I G
//Y I R
//
// 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:"PAHNAPLSIIGYIR"。
//
// 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 = "PAYPALISHIRING", numRows = 3
//输出:"PAHNAPLSIIGYIR"
//
//示例 2
//
//
//输入s = "PAYPALISHIRING", numRows = 4
//输出:"PINALSIGYAHRPI"
//解释:
//P I N
//A L S I G
//Y A H R
//P I
//
//
// 示例 3
//
//
//输入s = "A", numRows = 1
//输出:"A"
//
//
//
//
// 提示:
//
//
// 1 <= s.length <= 1000
// s 由英文字母(小写和大写)、',' 和 '.' 组成
// 1 <= numRows <= 1000
//
// Related Topics 字符串
// 👍 1175 👎 0
package leetcode.editor.cn;
//6:Z 字形变换
public class ZigzagConversion {
public static void main(String[] args) {
//测试代码
Solution solution = new ZigzagConversion().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public String convert(String s, int numRows) {
if (numRows == 1 || s == null) {
return s;
}
String[] strs = new String[numRows];
for (int i = 0; i < strs.length; i++) {
strs[i] = "";
}
String str = "";
int forNum = 2 * numRows - 2;
for (int i = 0; i < s.length(); i++) {
int index = (i + 1) % forNum;
if (index > numRows) {
strs[forNum + 1 - index] += "" + s.charAt(i);
} else if (index == 0) {
strs[1] += "" + s.charAt(i);
} else {
strs[index - 1] += "" + s.charAt(i);
}
}
for (String temp : strs) {
str += temp;
}
return str;
}
}
//leetcode submit region end(Prohibit modification and deletion)
}