From 77824baa7c7ba26c38444962f098d13054bf8c19 Mon Sep 17 00:00:00 2001
From: Vasily Guzov <vasily.guzov@gmail.com>
Date: Sun, 8 Dec 2024 23:53:36 +0300
Subject: [PATCH] [HAI] week3 backspace max solution

https://leetcode.com/problems/backspace-string-compare/submissions/1473739645/
---
 lib/backspaceCompare/backspaceCompare.test.ts | 26 +++++++++++++++
 lib/backspaceCompare/backspaceCompare.ts      | 31 +++++++++++++++++
 lib/backspaceCompare/index.ts                 |  3 ++
 lib/backspaceCompare/readme.md                | 33 +++++++++++++++++++
 4 files changed, 93 insertions(+)
 create mode 100644 lib/backspaceCompare/backspaceCompare.test.ts
 create mode 100644 lib/backspaceCompare/backspaceCompare.ts
 create mode 100644 lib/backspaceCompare/index.ts
 create mode 100644 lib/backspaceCompare/readme.md

diff --git a/lib/backspaceCompare/backspaceCompare.test.ts b/lib/backspaceCompare/backspaceCompare.test.ts
new file mode 100644
index 0000000..930a395
--- /dev/null
+++ b/lib/backspaceCompare/backspaceCompare.test.ts
@@ -0,0 +1,26 @@
+import { describe, it, expect } from "vitest";
+import { backspaceCompare } from "./backspaceCompare.ts";
+
+describe("backspaceCompare", () => {
+
+  it("ab#c, ad#c => true", () => {
+    expect(backspaceCompare("ab#c", "ad#c")).toBeTruthy();
+  });
+
+  it("ab##, c#d# => true", () => {
+    expect(backspaceCompare("ab##", "c#d#")).toBeTruthy();
+  });
+
+  it("a#c, b => false", () => {
+    expect(backspaceCompare("a#c", "b")).toBeFalsy();
+  });
+
+  it("bxj##tw, bxj###tw => false", () => {
+    expect(backspaceCompare("bxj##tw", "bxj###tw")).toBeFalsy();
+  });
+
+  it("nzp#o#g, b#nzp#o#g => true", () => {
+    expect(backspaceCompare("nzp#o#g", "b#nzp#o#g")).toBeTruthy();
+  });
+});
+
diff --git a/lib/backspaceCompare/backspaceCompare.ts b/lib/backspaceCompare/backspaceCompare.ts
new file mode 100644
index 0000000..659113c
--- /dev/null
+++ b/lib/backspaceCompare/backspaceCompare.ts
@@ -0,0 +1,31 @@
+function findNotSkipedIndex(s: string, i: number) {
+  let skipCount = 0;
+  while (i >= 0 && (skipCount > 0 || s[i] === '#')) {
+    if (s[i] === '#') {
+      skipCount += 1;
+      i -= 1;
+      continue;
+    }
+    skipCount -= 1;
+    i -= 1;
+  }
+  return i;
+};
+
+export function backspaceCompare(s: string, t: string): boolean {
+  let sI = s.length;
+  let tI = t.length;
+
+  while (sI > 0 && tI > 0) {
+    sI = findNotSkipedIndex(s, sI - 1);
+    tI = findNotSkipedIndex(t, tI - 1);
+
+
+    if (sI >= 0 && tI >= 0 && s[sI] !== t[tI]) {
+      return false;
+    }
+
+  }
+
+  return findNotSkipedIndex(s, sI - 1) === findNotSkipedIndex(t, tI - 1);
+};
diff --git a/lib/backspaceCompare/index.ts b/lib/backspaceCompare/index.ts
new file mode 100644
index 0000000..ffc0000
--- /dev/null
+++ b/lib/backspaceCompare/index.ts
@@ -0,0 +1,3 @@
+import { backspaceCompare } from "./backspaceCompare";
+
+export default backspaceCompare;
diff --git a/lib/backspaceCompare/readme.md b/lib/backspaceCompare/readme.md
new file mode 100644
index 0000000..946cefc
--- /dev/null
+++ b/lib/backspaceCompare/readme.md
@@ -0,0 +1,33 @@
+# backspaceCompare
+
+## описание задачи
+
+## тест кейсы
+
+## текстовое описание решения
+
+## ассимптотическая оценка
+
+| Description | Estimation |
+| ----------- | ---------- |
+| time:       | O(n)     |
+| mem:        | O(n)     |
+
+## time
+
+| Description                                 | Time  |
+| ------------------------------------------- | ----- |
+| анализ и сбор информации                    | 00:00 |
+| обдумываение решения и формулировка решения | 00:00 |
+| имплементация                               | 00:00 |
+| исправление ошибок                          | 00:00 |
+| полное время затраченое на решение          | 00:00 |
+
+## журнал ошибок
+
+## code
+
+### typescript
+
+ts
+