首页 > 代码库 > LeetCode 6 - ZigZag Conversion

LeetCode 6 - ZigZag Conversion

原题如下:

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".

实现思路比较简单直白,直接上代码吧:

 1     public String convert(String s, int nRows) { 2         int len = s.length(); 3         if(nRows >= len || nRows == 1){ 4             return s; 5         } 6         StringBuilder sb = new StringBuilder(); 7         for(int i =0; i< nRows; i++){ 8             int n = i; 9             while(n<len){10                 sb.append(s.charAt(n));11                 if(i!=0 && i!= nRows-1){12                     n+=(nRows-i-1)<<1;13                     if(n<len){14                         sb.append(s.charAt(n));15                         n+=i<<1;16                     }17                 }else{18                     n+=(nRows-1)<<1;19                 }20             }21         }22         return sb.toString();23     }

参考源码:https://github.com/pkufork/Martians/blob/master/src/main/java/com/pkufork/martians/leetcode/L6_ZigZagConversion.java

LeetCode 6 - ZigZag Conversion