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Commitedd9dcc

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‎README.md

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| # | Title | Solutions | Time | Space | Video | Difficulty | Tag
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|-----|----------------|---------------|---------------|---------------|--------|-------------|-------------
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|844|[Backspace String Compare](https://leetcode.com/problems/backspace-string-compare/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_844.java)| O(n)| O(1)||Easy|
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|832|[Flipping an Image](https://leetcode.com/problems/flipping-an-image/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_832.java)| O(n)| O(1)||Easy|
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|830|[Positions of Large Groups](https://leetcode.com/problems/positions-of-large-groups/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_830.java)| O(n)| O(n)||Easy|
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|824|[Goat Latin](https://leetcode.com/problems/goat-latin/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_824.java)| O(n)| O(1)||Easy|
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packagecom.fishercoder.solutions;
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/**
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* 844. Backspace String Compare
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*
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* Given two strings S and T, return if they are equal when both are typed into empty text editors. # means a backspace character.
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*
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* Example 1:
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* Input: S = "ab#c", T = "ad#c"
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* Output: true
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* Explanation: Both S and T become "ac".
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*
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* Example 2:
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* Input: S = "ab##", T = "c#d#"
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* Output: true
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* Explanation: Both S and T become "".
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*
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* Example 3:
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* Input: S = "a##c", T = "#a#c"
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* Output: true
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* Explanation: Both S and T become "c".
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*
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* Example 4:
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* Input: S = "a#c", T = "b"
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* Output: false
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* Explanation: S becomes "c" while T becomes "b".
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* Note:
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*
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* 1 <= S.length <= 200
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* 1 <= T.length <= 200
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* S and T only contain lowercase letters and '#' characters.
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* Follow up:
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*
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* Can you solve it in O(N) time and O(1) space?
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*/
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publicclass_844 {
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publicstaticclassSolution1 {
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publicbooleanbackspaceCompare(StringS,StringT) {
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StringprocessedS =process(S);
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StringprocessedT =process(T);
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returnprocessedS.equals(processedT);
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}
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privateStringprocess(Stringstr) {
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StringBuildersb =newStringBuilder();
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for (inti =0;i <str.length();i++) {
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if (str.charAt(i) =='#') {
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if (sb.length() >0) {
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sb.deleteCharAt(sb.length() -1);
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}
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}else {
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sb.append(str.charAt(i));
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}
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}
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returnsb.reverse().toString();
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}
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}
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}
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packagecom.fishercoder;
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importcom.fishercoder.solutions._844;
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importorg.junit.BeforeClass;
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importorg.junit.Test;
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importstaticorg.junit.Assert.assertEquals;
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publicclass_844Test {
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privatestatic_844.Solution1solution1;
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@BeforeClass
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publicstaticvoidsetup() {
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solution1 =new_844.Solution1();
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}
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@Test
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publicvoidtest1() {
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assertEquals(true,solution1.backspaceCompare("ab#c","ad#c"));
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}
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@Test
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publicvoidtest2() {
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assertEquals(true,solution1.backspaceCompare("ab##","c#d#"));
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}
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@Test
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publicvoidtest3() {
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assertEquals(true,solution1.backspaceCompare("a##c","#a#c"));
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}
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@Test
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publicvoidtest4() {
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assertEquals(false,solution1.backspaceCompare("a#c","b"));
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}
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}

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