LeetCode 6 ZigZag Conversion 模拟 难度:0

https://leetcode.com/problems/zigzag-conversion/

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".

class Solution {
public:
string convert(string s, int numRows) {
if(numRows == 1)return s;
string* a = new string[numRows];
string ans;
int n = 2 * numRows - 2;
for(int i = 0;i < s.size();i++)
{
int r = i % n;
int l = r % numRows;
if(l == r)a[l] += s[i];
else a[numRows - l - 2] += s[i];
}
for(int i = 0;i < numRows;i++){
ans += a[i];
}
return ans;
}
};

  

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