I'm posting my code for a LeetCode problem. If you'd like to review, please do so. Thank you for your time!
Problem
Two strings X and Y are similar if we can swap two letters (in different positions) of X, so that it equals Y. Also two strings X and Y are similar if they are equal.
For example, "tars" and "rats" are similar (swapping at positions 0 and 2), and "rats" and "arts" are similar, but "star" is not similar to "tars", "rats", or "arts".
Together, these form two connected groups by similarity: {"tars", "rats", "arts"} and {"star"}. Notice that "tars" and "arts" are in the same group even though they are not similar. Formally, each group is such that a word is in the group if and only if it is similar to at least one other word in the group.
We are given a list A of strings. Every string in A is an anagram of every other string in A. How many groups are there?
Example 1:
- Input:
A = ["tars","rats","arts","star"]- Output: 2
Constraints:
- \$1 <= A.\text{length} <= 2000\$
- \$1 <= A[i].\text{length} <= 1000\$
- \$A.\text{length} * A[i].\text{length} <= 20000\$
- All words in A consist of lowercase letters only.
- All words in A have the same length and are anagrams of each other.
- The judging time limit has been increased for this question.
Inputs
["tars","rats","arts","star"]
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Outputs
2
7
Code
public final class Solution {
public final int numSimilarGroups(final String[] A) {
if (A.length < 2) {
return A.length;
}
int groups = 0;
for (int i = 0; i < A.length; i++) {
if (A[i] == null) {
continue;
}
String s = A[i];
A[i] = null;
groups++;
depthFirstSearch(A, s);
}
return groups;
}
private static final void depthFirstSearch(final String[] A, final String s) {
for (int i = 0; i < A.length; i++) {
if (A[i] == null) {
continue;
}
if (areSimilar(s, A[i])) {
final String temp = A[i];
A[i] = null;
depthFirstSearch(A, temp);
}
}
}
private static final boolean areSimilar(final String a, final String b) {
int n = 0;
int i = 0;
while (n <= 2 && i < a.length()) {
if (a.charAt(i) != b.charAt(i)) {
n++;
}
i++;
}
return n == 2 || n == 0;
}
}
