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| class Solution {
public String convert(String s, int numRows) {
if (numRows < 2) {
return s;
}
StringBuilder[] lines = new StringBuilder[numRows];
for (int i = 0; i < numRows; i++) {
lines[i] = new StringBuilder();
}
int rowIndex = 0, direction = -1;
for (int i = 0; i < s.length(); i++) {
lines[rowIndex].append(s.charAt(i));
if (rowIndex == 0 || rowIndex == numRows - 1) {
direction = -direction;
}
rowIndex += direction;
}
StringBuilder sb = new StringBuilder();
for (StringBuilder line : lines) {
sb.append(line);
}
return sb.toString();
}
}
|