6. ZigZag Conversion
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 text, int nRows);
convert("PAYPALISHIRING", 3) should return "PAHNAPLSIIGYIR".
解析
// 6. ZigZag Conversion
class Solution_6 {
public:
string convert(string s, int numRows) {
if (numRows<=1)
{
return s;
}
//vector<string> vec; //numRows行 //
//string vec[numRows]; bug
string* vec = new string[numRows];
int step = 0, row = 0;
for (int i = 0; i < s.size();++i)
{
vec[row].push_back(s[i]);
if (row == 0)
{
step = 1;
}
if (row == numRows-1)
{
step = -1;
}
row = row + step;
}
string str="";
for (int i = 0; i < numRows; i++)
{
str += vec[i];
}
delete[] vec;
return str;
}
};
题目来源
