题目
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
十分钟尝试
没有思路，直接学习
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();
}
}