6. 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 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"
.
把一串字符反N方向n行排列:
class Solution {
public:
string convert(string s, int numRows) {
if (numRows <= 1)return s;
string result;
int i, j, k,len=s.length();
int inter = numRows*2-2,step=0;
for (i = 0; i < numRows; i++)
{
if (i!=0&&i !=numRows - 1)
{
step = inter - 2 * i;
j = i;
while (j < len)
{
result += s.at(j);
j = j + step;
step = inter - step;
}
}
else{
step = inter;
j = i;
while (j < len)
{
result += s.at(j);
j += step;
}
}
}
return result;
}
};