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zig-zag-conversion.ts
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zig-zag-conversion.ts
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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
Example 3:
Input: s = "A", numRows = 1
Output: "A"
Constraints:
1 <= s.length <= 1000
s consists of English letters (lower-case and upper-case), ',' and '.'.
1 <= numRows <= 1000
//my approach :
function convert(s: string, numRows: number): string {
let result = Array(numRows).fill('')
let resultIndex = 0
let step = 1
if (numRows === 1) {
return s
}
s.split('').forEach((char) => {
result[resultIndex] += char
if (resultIndex === numRows - 1) {
step = -1
}
if (resultIndex === 0) {
step = 1
}
resultIndex += step
})
return result.join('')
};