LeetCode Day 6
- 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" ,指定行数为 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"。
- 示例 1:
- 输入: s = "LEETCODEISHIRING", numRows = 3
- 输出: "LCIRETOESIIGEDHN"
/**
* @param {string} s
* @param {number} numRows
* @return {string}
*/
var convert = function (s, numRows) {
if (numRows === 1) return s;
let dataRow = new Array(numRows).fill('');
let rowNum = 1;
let moveDown = true;
for (let i = 0, lens = s.length; i < lens; i++) {
dataRow[rowNum - 1] += s[i];
if (moveDown) {
if (rowNum === numRows) {
moveDown = false;
}
} else {
if (rowNum === 1) {
moveDown = true;
}
}
if (moveDown) rowNum++;
else rowNum--;
}
let result = '';
for (row of dataRow) {
//console.log(row);
result += row;
}
return result;
};
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