-
Notifications
You must be signed in to change notification settings - Fork 0
/
Zigzag.cpp
42 lines (41 loc) · 1.02 KB
/
Zigzag.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
class Zigzag {
public:
string convert(string s, int numRows) {
if (numRows == 1) {
return s;
}
int n = s.size();
int cycle = numRows * 2 - 2;
string res;
for (int i = 0; i < numRows; i++) {
for (int j = 0; j + i < n; j += cycle) {
res += s[i + j];
if (i != 0 && i != numRows - 1 && j + cycle - i < n) {
res += s[j + cycle - i];
}
}
}
return res;
}
// for a half of cycle, we add all the same place in the rest of the cycles
string convert1(string s, int numRows) {
if (numRows == 1) {
return s;
}
int size = s.size();
int cycle = numRows * 2 - 2;
string res;
for (int i = 0; i <= cycle / 2; i++) {
int front = i, back = cycle - i;
while (front < size) {
res += s[front];
if (back < s.size() && back != front && back != front + cycle) {
res += s[back];
}
front += cycle;
back += cycle;
}
}
return res;
}
};