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40 lines (36 loc) · 1 KB
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package leetcode.medium;
public class P_161 {
public boolean isOneEditDistance(String s, String t) {
if (s.length() == t.length()) {
return checkReplace(s, t);
}
if (s.length() - 1 == t.length()) {
return checkDelete(t, s);
}
if (s.length() + 1 == t.length()) {
return checkDelete(s, t);
}
return false;
}
private static boolean checkReplace(String s, String t) {
int diff = 0;
for (int i = 0; i < s.length(); i++) {
if (t.charAt(i) != s.charAt(i)) {
diff++;
}
}
return diff == 1;
}
private static boolean checkDelete(String s1, String s2) {
for (int i = 0, j = 0; i < s1.length() && j < s2.length(); j++) {
if (s1.charAt(i) != s2.charAt(j)) {
if (i != j) {
return false;
}
} else {
i++;
}
}
return true;
}
}