[sukyoungshin] WEEK 06

container-with-most-water/sukyoungshin.ts

@@ -0,0 +1,42 @@
+// 1번째 풀이
+function maxArea1(height: number[]): number {
+let left = 0;
+let right = height.length - 1;
+const area: number[] = [];
+
+  while (left < right) {
+    const x = right - left;
+    const y = Math.min(height[left], height[right]);
+    area.push(x * y);
+
+    if (height[left] < height[right]) {
+      left++;
+    } else {
+      right--;
+    }
+  }
+
+  return Math.max(...area);
+};
+
+// 2번째 풀이
+function maxArea2(height: number[]): number {
+  let left = 0;
+  let right = height.length - 1;
+  let max = 0;
+
+  while (left < right) {
+    const x = right - left;
+    const y = Math.min(height[left], height[right]);
+    const current = x * y;
+    max = Math.max(max, current);
+
+    if (height[left] < height[right]) {
+      left++;
+    } else {
+      right--;
+    }
+  }
+
+  return max;
+};

design-add-and-search-words-data-structure/sukyoungshin.ts

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+// 1번풀이 O(n × m)
+class WordDictionary1 {
+  private words: string[];
+  constructor() {
+    this.words = [];
+  }
+
+  addWord(word: string): void {
+    this.words.push(word);
+  }
+  search(word: string): boolean {
+    return this.words
+      .filter((savedWord) => savedWord.length === word.length)
+      .some((savedWord) => {
+        for (let i = 0; i < word.length; i++) {
+          if (word[i] === ".") continue;
+          if (word[i] !== savedWord[i]) return false;
+        }
+        return true;
+      });
+  }
+};
+
+// 2번풀이 : Trie(트라이) 자료구조
+type TrieNode = {
+  children: { [key: string]: TrieNode };
+  isEnd: boolean;
+};
+
+class WordDictionary {
+  private root: TrieNode;
+  constructor() {
+    this.root = {
+      children: {},
+      isEnd: false,
+    };
+  }
+  addWord(word: string): void {
+    let node = this.root;
+
+    for (let i = 0; i < word.length; i++) {
+      const char = word[i];
+
+      if (!node.children[char]) {
+        node.children[char] = {
+          children: {},
+          isEnd: false,
+        };
+      }
+
+      node = node.children[char];
+    }
+
+    node.isEnd = true;
+  }
+  search(word: string): boolean {
+    const dfs = (node: TrieNode, index: number): boolean => {
+      if (index === word.length) return node.isEnd;
+
+      const char = word[index];
+
+      if (char === ".") {
+        for (const nextChar in node.children) {
+          if (dfs(node.children[nextChar], index + 1)) {
+            return true;
+          }
+        }
+        return false;
+      }
+
+      if (!node.children[char]) return false;
+      return dfs(node.children[char], index + 1);
+    };
+
+    return dfs(this.root, 0);
+  }
+};

valid-parentheses/sukyoungshin.ts

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+const pairs = {
+  ")": "(",
+  "}": "{",
+  "]": "[",
+};
+
+function isValid(s: string): boolean {
+  const stack: string[] = [];
+  for (let i = 0; i < s.length; i++) {
+    const str = s[i];
+
+    if (str in pairs) {
+      if (pairs[str] !== stack[stack.length - 1]) {
+        return false;
+      } else {
+        stack.pop();
+      }
+    } else {
+      stack.push(str);
+    }
+  }
+
+  return stack.length === 0;
+};