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 RAnd 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 *res = new string[numRows]; // 运行时分配在堆上
int i = 0, j, gap = numRows - 2;
while(i<s.size()){
for (j = 0;i < s.size() && j < numRows;++j) res[j] += s[i++]; //行循环
for (j = gap; i < s.size() && j > 0; --j) res[j] += s[i++]; //斜边,去掉第一行,最后一行
}
string str = "";
for (i = 0;i < numRows;i++)
str += res[i]; //将每行字符串粘在一起
return str;
}
};
来源于以下链接:http://www.cnblogs.com/sanghai/p/3632528.html#undefined