6. Zigzag Conversion | Leetcode | Medium | Java | String | Google

"Zigzag Conversion" an intermediate-level problem on LeetCode serves as a foundational exercise for developing intuition in problem-solving, particularly for challenges that demand a keen understanding of patterns and logical reasoning. The crux of this question lies in recognizing the strategic necessity of utilizing multiple strings to construct the final string, which represents a sequence of rows. The intricacy of the zigzag pattern introduces the need for a methodical approach, wherein two distinct directions of traversal across the rows play a crucial role.

This problem not only tests one's ability to discern intricate patterns but also demands a strategic mindset to navigate through multiple rows in a zigzag fashion, ultimately leading to a comprehensive and efficient solution.

Other problems for practice:

[rishikesh]

Good video quality but please make it in English so you can reach wider range of audience.

[yashgupta]

Sach me yrrr itna easily samjha diya
Maine sochne me 1 Ghnta khrab kiya 2 minute ne doubt clr ho gya
Awesome sister ❤

[Ayush]

Awesome explanation!!!

How to think like that?
I was solving this question using a matrix and storing every character in it 😢

[pranawkaushal]

public String convert(String s, int numRows) {
if (numRows == 1) return s; // Edge case for a single row

StringBuilder[] rows = new StringBuilder[numRows];
for (int i = 0; i < numRows; i++) {
rows[i] = new StringBuilder();
}
int i = 0;
while (i < s.length()) {
for (int index = 0; index < numRows && i < s.length(); index++) {

}
for (int index = numRows - 2; index > 0 && i < s.length(); index--) {

}
}
StringBuilder sb = new StringBuilder();
for (StringBuilder str : rows) {
sb.append(str.toString());
}
return sb.toString();

}

We can use StringBuilder instead of String for memory optimization

[yutubegaming]

is this explanation lol BRUTE FORCE