Method convert

src/com/blankj/medium/_0006/Solution.java:35–56

(String s, int numRows)

//    }

    public String convert(String s, int numRows) {
        if (numRows <= 1) return s;
        int len = s.length();
        char[] chars = s.toCharArray();
        StringBuilder[] sbs = new StringBuilder[numRows];
        for (int i = 0; i < numRows; i++) {
            sbs[i] = new StringBuilder();
        }
        int i = 0;
        while (i < len) {
            for (int j = 0; j < numRows && i < len; ++j) {
                sbs[j].append(chars[i++]);
            }
            for (int j = numRows - 2; j >= 1 && i < len; --j) {
                sbs[j].append(chars[i++]);
            }
        }
        for (i = 1; i < numRows; i++) {
            sbs[0].append(sbs[i]);
        }
        return sbs[0].toString();
    }

    public static void main(String[] args) {
        Solution solution = new Solution();