LeetCode (Z)

ZigZag Conversion

 

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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   NA P L S I I GY   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 text, int nRows);

convert("PAYPALISHIRING", 3) should return "PAHNAPLSIIGYIR".

class Solution {public:string convert(string s, int nRows) {    if (nRows == 1) return s;vector<string> vec(nRows);for (int i = 0, j = 0, k = 1; s[i]; ++i, j += k) {vec[j] += s[i];if (j == nRows - 1)k = -1;else if (j == 0)k = 1;}string ans;for (int i = 0; i < nRows; ++i)ans += vec[i];return ans;}};