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
var convert = function(s, numRows) {
let res = [];
let count = 0;
let up = true;
for(let i =0; i<s.length;i++){
if(!res[count]) res[count] = []
res[count].push(s[i])
count = up ? count+1 : count-1
if(count+1 == numRows) up = false;
else if(count == 0) up = true;
}
let result = ''
for(let i of res){
result += i.join('')
}
return result;
};
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