目录:
题目:
将一个给定字符串根据给定的行数,以从上往下、从左到右进行 Z 字形排列。
比如输入字符串为 "LEETCODEISHIRING" 行数为 3 时,排列如下:
L C I R
E T O E S I I G
E D H N
之后,你的输出需要从左往右逐行读取,产生出一个新的字符串,比如:"LCIRETOESIIGEDHN"。
请你实现这个将字符串进行指定行数变换的函数:
string convert(string s, int numRows);
示例 1:
输入: s = "LEETCODEISHIRING", numRows = 3
输出: "LCIRETOESIIGEDHN"
示例 2:
输入: s = "LEETCODEISHIRING", numRows = 4
输出: "LDREOEIIECIHNTSG"
解释:
L D R
E O E I I
E C I H N
T S G
脚本及注释:【耗时:56ms】
class Solution: def convert(self, s: str, numRows: int) -> str: str1 = "" len1 = len(s) kk = 0 if numRows == 1: return(s) n1 = (numRows - 1) * 2 if numRows == 2: for i in range(0,len1,2): str1 += s[i] for j in range(1,len1,2): str1 += s[j] return(str1) else: for i in range(numRows): j = i while j+1 <= len1: str1 += s[j] j += 2*(numRows - i -1) #if j+1 <= len1: # str1 += s[j] bb = n1 - 2*(numRows - i -1) if bb == 0: if j+1 <= len1: str1 += s[j] j += 2*(numRows - i -1) elif bb == n1: j += n1 else: #print(bb,j) if j+1 <= len1: str1 += s[j] j += bb return(str1)
脚本逻辑:
原文:https://www.cnblogs.com/mailong/p/12227357.html