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leetcode--ZigZag Conversion
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".
public class Solution { public String convert(String s, int nRows) { int length = s.length(); if(nRows == 0) return null; if(length <= nRows || nRows == 1) return s; String[] zigzag = new String[nRows]; for(int i = 0; i < nRows; ++i) zigzag[i] = ""; int startIndex = 0; while(startIndex < length){ for(int j = 0 ; j < Math.min(length - startIndex, 2*nRows - 2); ++j){ if(j < nRows) zigzag[j] += s.substring(startIndex + j, startIndex + j + 1); else zigzag[2*nRows - 2 - j] += s.substring(startIndex + j, startIndex + j + 1); } startIndex += 2*nRows - 2; } //concatenate components String converted =""; for(int i = 0; i < nRows; ++i) converted += zigzag[i]; return converted; }}
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