ZigZag|ZigZag Conversion题目及解法
问题描述:
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)
PAHN A P L S I I G YIR
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"
. 【ZigZag|ZigZag Conversion题目及解法】大致思路,用空间换时间,看每一个字母放第几行,用step控制行数,当遍历完s时,把每一行的字符串连接起来即可得到答案。
代码如下:
if (numRows <= 1)
return s;
const int len = (int)s.length();
string *str = new string[numRows];
int row = 0, step = 1;
for (int i = 0;
i < len;
++i)
{
str[row].push_back(s[i]);
if (row == 0)
step = 1;
else if (row == numRows - 1)
step = -1;
row += step;
}
s.clear();
for (int j = 0;
j < numRows;
++j)
{
s.append(str[j]);
}
delete[] str;
return s;
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