diff --git "a/solutions/yesul/0128/[\353\254\270\354\240\23418]\353\221\220\352\260\234\354\235\230\354\210\230\353\241\234\355\212\271\354\240\225\352\260\222\353\247\214\353\223\244\352\270\260.js" "b/solutions/yesul/0128/[\353\254\270\354\240\23418]\353\221\220\352\260\234\354\235\230\354\210\230\353\241\234\355\212\271\354\240\225\352\260\222\353\247\214\353\223\244\352\270\260.js"
new file mode 100644
index 0000000..f5bca35
--- /dev/null
+++ "b/solutions/yesul/0128/[\353\254\270\354\240\23418]\353\221\220\352\260\234\354\235\230\354\210\230\353\241\234\355\212\271\354\240\225\352\260\222\353\247\214\353\223\244\352\270\260.js"
@@ -0,0 +1,14 @@
+function solution(arr, target) {
+    for (let i = 0; i < arr.length; i++) {
+        for (let j = i + 1; j < arr.length; j++) {
+            if (arr[i] + arr[j] === target) {
+                return true; ll
+            }
+        }
+    }
+
+    return false;
+}
+
+console.log(solution([1, 2, 3, 4, 8], 6)); // true
+console.log(solution([2, 3, 5, 9], 10)); // false
\ No newline at end of file
diff --git "a/solutions/yesul/0128/[\353\254\270\354\240\23419]\353\254\270\354\236\220\354\227\264\355\225\264\354\213\261\354\235\204\354\235\264\354\232\251\355\225\234\352\262\200\354\203\211\355\225\250\354\210\230\353\247\214\353\223\244.js" "b/solutions/yesul/0128/[\353\254\270\354\240\23419]\353\254\270\354\236\220\354\227\264\355\225\264\354\213\261\354\235\204\354\235\264\354\232\251\355\225\234\352\262\200\354\203\211\355\225\250\354\210\230\353\247\214\353\223\244.js"
new file mode 100644
index 0000000..9c8de3a
--- /dev/null
+++ "b/solutions/yesul/0128/[\353\254\270\354\240\23419]\353\254\270\354\236\220\354\227\264\355\225\264\354\213\261\354\235\204\354\235\264\354\232\251\355\225\234\352\262\200\354\203\211\355\225\250\354\210\230\353\247\214\353\223\244.js"
@@ -0,0 +1,8 @@
+// function solution(stringList, queryList) {
+//     return queryList.map((query) => stringList.includes(query));
+// }
+
+function solution(stringList, queryList) {
+}
+
+console.log(solution(["apple", "banana", "charry"], ["banana", "kiwi", "melon", "apple"])); // [true, false, false, true]
\ No newline at end of file
diff --git "a/solutions/yesul/0128/[\353\254\270\354\240\23420]\354\231\204\354\243\274\355\225\230\354\247\200\353\252\273\355\225\234\354\204\240\354\210\230.js" "b/solutions/yesul/0128/[\353\254\270\354\240\23420]\354\231\204\354\243\274\355\225\230\354\247\200\353\252\273\355\225\234\354\204\240\354\210\230.js"
new file mode 100644
index 0000000..97a0230
--- /dev/null
+++ "b/solutions/yesul/0128/[\353\254\270\354\240\23420]\354\231\204\354\243\274\355\225\230\354\247\200\353\252\273\355\225\234\354\204\240\354\210\230.js"
@@ -0,0 +1,17 @@
+function solution(participant, completion) {
+    // 1. reduce로 참가자 명단 만들기
+    const userHash = participant.reduce((obj, cur) => {
+        obj[cur] = (obj[cur] || 0) + 1;
+        return obj; // 다음 루프로 객체를 넘겨줌
+    }, {});
+
+    // 2. 완주자 처리
+    for (const name of completion) {
+        userHash[name]--;
+    }
+
+    // 3. 결과 반환
+    return Object.keys(userHash).find(key => userHash[key] > 0);
+}
+
+console.log(solution(["leo", "kiki", "eden"], ["eden", "kiki"])); // "leo"
\ No newline at end of file
diff --git "a/solutions/yesul/0128/[\353\254\270\354\240\23421]\354\230\201\354\226\264\353\201\235\353\247\220\354\236\207\352\270\260.js" "b/solutions/yesul/0128/[\353\254\270\354\240\23421]\354\230\201\354\226\264\353\201\235\353\247\220\354\236\207\352\270\260.js"
new file mode 100644
index 0000000..a3152d5
--- /dev/null
+++ "b/solutions/yesul/0128/[\353\254\270\354\240\23421]\354\230\201\354\226\264\353\201\235\353\247\220\354\236\207\352\270\260.js"
@@ -0,0 +1,35 @@
+function solution(n, words) {
+    const answer = ''
+
+    const usedWords = new Set();
+
+    const findIndex = words.findIndex((word, index) => {
+        if (index === 0) {
+            usedWords.add(word);
+            return false;
+        }
+
+        const isWrong = words[index - 1].at(-1) !== word.at(0)
+        const isDuplicated = usedWords.has(word);
+
+        if (isWrong || isDuplicated) {
+            return true;
+        }
+
+        usedWords.add(word);
+        return false;
+    });
+
+    if (findIndex === -1) return [0, 0]
+
+
+    const userNum = (findIndex % n) + 1;
+    const wrongCountNum = Math.ceil((findIndex + 1) / n);
+
+
+    return [userNum, wrongCountNum];
+}
+
+console.log(solution(3, ["tank", "kick", "know", "wheel", "land", "dream", "mother", "robot", "tank"])); // [3,3]
+console.log(solution(5, ["hello", "observe", "effect", "take", "either", "recognize", "encourage", "ensure", "establish", "hang", "gather", "refer", "reference", "estimate", "executive"])); // [0,0]
+console.log(solution(2, ["hello", "one", "even", "never", "now", "world", "draw"])); // [1,3]
\ No newline at end of file
diff --git "a/solutions/yesul/0128/[\353\254\270\354\240\23422]\354\240\204\355\231\224\353\262\210\355\230\270\353\252\251\353\241\235.js" "b/solutions/yesul/0128/[\353\254\270\354\240\23422]\354\240\204\355\231\224\353\262\210\355\230\270\353\252\251\353\241\235.js"
new file mode 100644
index 0000000..59bc6a9
--- /dev/null
+++ "b/solutions/yesul/0128/[\353\254\270\354\240\23422]\354\240\204\355\231\224\353\262\210\355\230\270\353\252\251\353\241\235.js"
@@ -0,0 +1,13 @@
+function solution(phone_book) {
+    phone_book.sort();
+    for (let i = 0; i < phone_book.length - 1; i++) {
+        if (phone_book[i + 1].startsWith(phone_book[i])) {
+            return false;
+        }
+    }
+    return true;
+}
+
+console.log(solution(["119", "97674223", "1195524421"])); // false
+console.log(solution(["123", "456", "789"])); // true
+console.log(solution(["12", "123", "1235", "567", "88"])); // false
\ No newline at end of file
diff --git "a/solutions/yesul/0128/[\353\254\270\354\240\23423]\355\225\240\354\235\270\355\226\211\354\202\254.js" "b/solutions/yesul/0128/[\353\254\270\354\240\23423]\355\225\240\354\235\270\355\226\211\354\202\254.js"
new file mode 100644
index 0000000..8d88946
--- /dev/null
+++ "b/solutions/yesul/0128/[\353\254\270\354\240\23423]\355\225\240\354\235\270\355\226\211\354\202\254.js"
@@ -0,0 +1,54 @@
+function solution(want, number, discount) {
+    let answer = 0;
+
+    const wantMap = want.reduce((acc, cur, index) => {
+        acc[cur] = number[index];
+        return acc;
+    }, {});
+
+    // 0일째 ~ 9일째
+    // 마트 할인 기간이 끝나기 10일 전까지만 가입할 있기 때문에
+    // discount.length - 10으로 제한
+    for (let i = 0; i <= discount.length - 10; i++) {
+        // N일차의 할일 목록을 담을 객체
+        const discountMap = {};
+
+        // 가입한 날 부터 10일동안 어떤 물품이 몇 개 있는지
+        for (let j = i; j < i + 10; j++) {
+            const item = discount[j];
+            discountMap[item] = (discountMap[item] || 0) + 1;
+        }
+
+        // 사고 싶던 것과 개수가 일치하는지 확인
+        if (isMatch(wantMap, discountMap)) {
+            answer++; // 성공횟수 추가
+        }
+    }
+
+
+    function isMatch(wantMap, discountMap) {
+        for (const key in wantMap) {
+            if (discountMap[key] !== wantMap[key]) return false;
+        }
+        return true;
+    }
+
+    return answer;
+}
+
+
+
+console.log(
+    solution(
+        ["banana", "apple", "rice", "pork", "pot"],
+        [3, 2, 2, 2, 1],
+        ["chicken", "apple", "apple", "banana", "rice", "apple", "pork", "banana", "pork", "rice", "pot", "banana", "apple", "banana"]
+    )
+) // 3
+
+console.log(
+    solution(["apple"],
+        [10],
+        ["banana", "banana", "banana", "banana", "banana", "banana", "banana", "banana", "banana", "banana"],
+    )
+) // 0
\ No newline at end of file
diff --git "a/solutions/yesul/0130/[\353\254\270\354\240\23428]\355\212\270\353\246\254\354\210\234\355\232\214.js" "b/solutions/yesul/0130/[\353\254\270\354\240\23428]\355\212\270\353\246\254\354\210\234\355\232\214.js"
new file mode 100644
index 0000000..8d9debc
--- /dev/null
+++ "b/solutions/yesul/0130/[\353\254\270\354\240\23428]\355\212\270\353\246\254\354\210\234\355\232\214.js"
@@ -0,0 +1,55 @@
+function solution(input) {
+    const [n, ...trees] = input.split('\n')
+    const tree = {};
+
+    for (let i = 1; i <= n; i++) {
+        const [node, left, right] = trees[i - 1].split(' ');
+        tree[node] = [left, right];
+    }
+
+    let result = '';
+
+    // 전위 순회
+    function preOrder(node) {
+        if (node === '.') return;
+        const [left, right] = tree[node];
+        result += node;
+        preOrder(left);
+        preOrder(right);
+    }
+
+    // 중위 순회
+    function inOrder(node) {
+        if (node === '.') return;
+        const [left, right] = tree[node];
+        inOrder(left);
+        result += node;
+        inOrder(right);
+    }
+
+    // 후위 순회
+    function postOrder(node) {
+        if (node === '.') return;
+        const [left, right] = tree[node];
+        postOrder(left);
+        postOrder(right);
+        result += node;
+    }
+
+    preOrder("A");
+    result += "\n";
+    inOrder("A");
+    result += "\n";
+    postOrder("A");
+
+    return result;
+}
+
+console.log(solution(`7
+A B C
+B D .
+C E F
+E . .
+F . G
+D . .
+G . .`)) 
\ No newline at end of file
diff --git "a/solutions/yesul/0130/[\353\254\270\354\240\23429]\354\235\264\354\247\204\355\203\220\354\203\211\355\212\270\353\246\254\352\265\254\355\230\204.js" "b/solutions/yesul/0130/[\353\254\270\354\240\23429]\354\235\264\354\247\204\355\203\220\354\203\211\355\212\270\353\246\254\352\265\254\355\230\204.js"
new file mode 100644
index 0000000..525ec3f
--- /dev/null
+++ "b/solutions/yesul/0130/[\353\254\270\354\240\23429]\354\235\264\354\247\204\355\203\220\354\203\211\355\212\270\353\246\254\352\265\254\355\230\204.js"
@@ -0,0 +1,67 @@
+class Node {
+    constructor(value) {
+        this.value = value;
+        this.left = null;
+        this.right = null;
+    }
+}
+
+class BinarysearchTree {
+    constructor() {
+        this.root = null;
+    }
+
+    insert(value) {
+        const newNode = new Node(value);
+        if (this.root === null) {
+            this.root = newNode;
+        } else {
+            this.insertNode(this.root, newNode);
+        }
+    }
+
+    insertNode(node, newNode) {
+        if (node.value > newNode.value) {
+            if (node.left === null) {
+                node.left = newNode;
+            } else {
+                this.insertNode(node.left, newNode);
+            }
+        } else {
+            if (node.right === null) {
+                node.right = newNode;
+            } else {
+                this.insertNode(node.right, newNode)
+            }
+        }
+    }
+
+    search(value) {
+        let current = this.root;
+
+        while (current) {
+            if (current.value === value) {
+                return true;
+            } else if (current.value > value) {
+                current = current.left;
+            } else {
+                current = current.right;
+            }
+        }
+
+        return false;
+    }
+}
+
+function solution(list, searchList) {
+    const tree = new BinarysearchTree();
+    list.forEach(node => tree.insert(node));
+
+    return searchList.map(node => tree.search(node));
+}
+
+console.log(solution([5, 3, 8, 4, 2, 1, 7, 10], [1, 2, 5, 6]))
+// [true, true, true, false]
+
+console.log(solution([1, 3, 5, 7, 9], [2, 4, 6, 8, 10]))
+// [false, false, false, false, false]
\ No newline at end of file
diff --git "a/solutions/yesul/0130/[\353\254\270\354\240\23430]\354\230\210\354\203\201\353\214\200\354\247\204\355\221\234.js" "b/solutions/yesul/0130/[\353\254\270\354\240\23430]\354\230\210\354\203\201\353\214\200\354\247\204\355\221\234.js"
new file mode 100644
index 0000000..466e578
--- /dev/null
+++ "b/solutions/yesul/0130/[\353\254\270\354\240\23430]\354\230\210\354\203\201\353\214\200\354\247\204\355\221\234.js"
@@ -0,0 +1,11 @@
+function solution(n, a, b) {
+    let round = 0;
+    while (a !== b) {
+        a = Math.ceil(a / 2);
+        b = Math.ceil(b / 2);
+
+        round++;
+    }
+
+    return round;
+}
\ No newline at end of file