LeetCode刷題Medium篇Zigzag Conversion
阿新 • • 發佈:2018-12-20
題目
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 N A P L S I I G Y 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 s, int numRows);
Example 1:
Input: s = "PAYPALISHIRING", numRows = 3 Output: "PAHNAPLSIIGYIR"
Example 2:
Input: s = "PAYPALISHIRING", numRows = 4 Output: "PINALSIGYAHRPI" Explanation: P I N A L S I G Y A H R P I
十分鐘嘗試
沒有思路,直接學習
class Solution { public String convert(String s, int numRows) { char[] c=s.toCharArray(); StringBuffer[] sb=new StringBuffer[numRows]; for(int i=0;i<sb.length;i++) sb[i]=new StringBuffer(); int i=0; int len=s.length(); while(i<len){ for(int idx=0;idx<numRows&&i<len;idx++){ sb[idx].append(c[i++]); } for(int idx=numRows-2;idx>=1&&i<len;idx--){ sb[idx].append(c[i++]); } } for(int j=1;j<sb.length;j++){ sb[0].append(sb[j]); } return sb[0].toString(); } }