xxx
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"
.题
思路,每行,按照交替的顺序递增,找规律
class Solution {
public:
string convert(string s, int nRows) {
string out;
const int len=s.size();
if(nRows==1)
return s;
for(int i=0;i<nRows;i++){
int j=i;
bool flag=true;
while(j<len){
out.push_back(s[j]);
if(i == 0 || i == nRows - 1) {
j += 2 * (nRows - 1);
}
else {
if(flag) {
j += 2 * (nRows - 1 - i);
flag = false;
}
else {
j += 2 * i;
flag = true;
}
}
}
}
return out;
}
};