diff --git "a/\353\217\204\354\234\244/week5/[Lv 1] MemoryScore.js" "b/\353\217\204\354\234\244/week5/[Lv 1] MemoryScore.js"
new file mode 100644
index 0000000..0d2a3ad
--- /dev/null
+++ "b/\353\217\204\354\234\244/week5/[Lv 1] MemoryScore.js"	
@@ -0,0 +1,15 @@
+// Lv 1. 추억 점수 - 연습문제
+function solution(name, yearning, photo) {
+  let missingScore = [];
+  let tmpScr = 0;
+  for (let i = 0; i < photo.length; i++) {
+    tmpScr = 0;
+    for (let j = 0; j < photo[i].length; j++) {
+      if (name.includes(photo[i][j])) {
+        tmpScr += yearning[name.indexOf(photo[i][j])];
+      }
+    }
+    missingScore.push(tmpScr);
+  }
+  return missingScore;
+}
diff --git "a/\353\217\204\354\234\244/week5/[Lv 1] SecretCode.js" "b/\353\217\204\354\234\244/week5/[Lv 1] SecretCode.js"
new file mode 100644
index 0000000..518e86d
--- /dev/null
+++ "b/\353\217\204\354\234\244/week5/[Lv 1] SecretCode.js"	
@@ -0,0 +1,13 @@
+// Lv 1. 둘만의 암호 - 연습문제
+function solution(s, skip, index) {
+  let answer = "";
+  const alphArr = Array(26)
+    .fill()
+    .map((v, i) => String.fromCharCode(i + 97))
+    .filter((elm) => !skip.includes(elm));
+  s.split("").forEach((elm, idx) => {
+    let newIdx = (alphArr.indexOf(elm) + index) % alphArr.length;
+    answer += alphArr[newIdx];
+  });
+  return answer;
+}
diff --git "a/\353\217\204\354\234\244/week5/[Lv 1] Test.js" "b/\353\217\204\354\234\244/week5/[Lv 1] Test.js"
new file mode 100644
index 0000000..d6b0747
--- /dev/null
+++ "b/\353\217\204\354\234\244/week5/[Lv 1] Test.js"	
@@ -0,0 +1,23 @@
+// Lv 1. 모의고사 - 완전탐색
+function solution(answers) {
+  const sol1 = [1, 2, 3, 4, 5],
+    sol2 = [2, 1, 2, 3, 2, 4, 2, 5],
+    sol3 = [3, 3, 1, 1, 2, 2, 4, 4, 5, 5];
+  let cnt1 = 0,
+    cnt2 = 0,
+    cnt3 = 0;
+  const answer = [];
+
+  answers.forEach((elm, idx) => {
+    if (sol1[idx % sol1.length] === elm) cnt1++;
+    if (sol2[idx % sol2.length] === elm) cnt2++;
+    if (sol3[idx % sol3.length] === elm) cnt3++;
+  });
+
+  const max = Math.max(cnt1, cnt2, cnt3);
+  if (cnt1 === max) answer.push(1);
+  if (cnt2 === max) answer.push(2);
+  if (cnt3 === max) answer.push(3);
+
+  return answer;
+}
diff --git "a/\353\217\204\354\234\244/week5/[Lv 2] Fibonacci.js" "b/\353\217\204\354\234\244/week5/[Lv 2] Fibonacci.js"
new file mode 100644
index 0000000..b86ff59
--- /dev/null
+++ "b/\353\217\204\354\234\244/week5/[Lv 2] Fibonacci.js"	
@@ -0,0 +1,13 @@
+// Lv 2. 피보나치 수 - 연습문제
+function solution(n) {
+  let add1 = 0,
+    add2 = 1,
+    sum = 0,
+    mod = 0;
+  for (let i = 2; i <= n; i++) {
+    sum = (add1 + add2) % 1234567;
+    add1 = add2;
+    add2 = sum;
+  }
+  return sum;
+}
diff --git "a/\353\217\204\354\234\244/week5/[Lv 2] NextBigNumber.js" "b/\353\217\204\354\234\244/week5/[Lv 2] NextBigNumber.js"
new file mode 100644
index 0000000..fb322cd
--- /dev/null
+++ "b/\353\217\204\354\234\244/week5/[Lv 2] NextBigNumber.js"	
@@ -0,0 +1,22 @@
+// Lv 2. 다음 큰 숫자 - 연습문제
+function solution(n) {
+  const findCnt = (num) => {
+    return num
+      .toString(2)
+      .split("")
+      .filter((elm) => elm === "1").length;
+  };
+
+  let start = n + 1;
+  let oneCnt = 0;
+
+  while (true) {
+    oneCnt = findCnt(start);
+    if (oneCnt === findCnt(n)) {
+      break;
+    }
+    start++;
+  }
+
+  return start;
+}
diff --git "a/\353\217\204\354\234\244/week6/[Lv 1] FoodFight.js" "b/\353\217\204\354\234\244/week6/[Lv 1] FoodFight.js"
new file mode 100644
index 0000000..55d2004
--- /dev/null
+++ "b/\353\217\204\354\234\244/week6/[Lv 1] FoodFight.js"	
@@ -0,0 +1,8 @@
+// Lv 1. 푸드 파이트 대회 - 연습문제
+function solution(food) {
+  let perFood = [];
+  for (let i = 1; i < food.length; i++) {
+    perFood.push(i.toString().repeat(Math.floor(food[i] / 2)));
+  }
+  return perFood.join("") + "0" + perFood.reverse().join("");
+}
diff --git "a/\353\217\204\354\234\244/week6/[Lv 1] Noncompletion.js" "b/\353\217\204\354\234\244/week6/[Lv 1] Noncompletion.js"
new file mode 100644
index 0000000..494f94b
--- /dev/null
+++ "b/\353\217\204\354\234\244/week6/[Lv 1] Noncompletion.js"	
@@ -0,0 +1,30 @@
+// Lv 1. 완주하지 못한 선수 - 해시
+function solution(participant, completion) {
+  let answer = "";
+
+  participant.sort();
+  completion.sort();
+
+  for (let i = 0; i < participant.length; i++) {
+    if (participant[i] !== completion[i]) {
+      answer = participant[i];
+      break;
+    }
+  }
+  return answer;
+}
+
+// 첫번째 풀이 - 효율성 검사 통과 X
+// function solution(participant, completion){
+//   let idx = -1;
+//   let answer = "";
+//   participant.forEach((elm)=> {
+//       if(completion.includes(elm)){
+//           idx = completion.indexOf(elm);
+//           completion.splice(idx, 1);
+//       }else{
+//           answer = elm;
+//       }
+//   })
+//   return answer;
+// }
diff --git "a/\353\217\204\354\234\244/week6/[Lv 1] Paint.js" "b/\353\217\204\354\234\244/week6/[Lv 1] Paint.js"
new file mode 100644
index 0000000..6b550d8
--- /dev/null
+++ "b/\353\217\204\354\234\244/week6/[Lv 1] Paint.js"	
@@ -0,0 +1,12 @@
+// Lv 1. 덧칠하기 - 연습문제
+function solution(n, m, section) {
+  let paint = 0,
+    answer = 0;
+  section.forEach((elm) => {
+    if (elm > paint) {
+      paint = elm + (m - 1);
+      answer++;
+    }
+  });
+  return answer;
+}
diff --git "a/\353\217\204\354\234\244/week6/[Lv 1] Ranking .js" "b/\353\217\204\354\234\244/week6/[Lv 1] Ranking .js"
new file mode 100644
index 0000000..1313ad2
--- /dev/null
+++ "b/\353\217\204\354\234\244/week6/[Lv 1] Ranking .js"	
@@ -0,0 +1,12 @@
+// Lv 1. 명예의 전당 (1) - 연습문제
+function solution(k, score) {
+  let rank = [],
+    answer = [];
+
+  for (let i = 0; i < score.length; i++) {
+    rank.push(score[i]);
+    rank = rank.sort((a, b) => b - a).slice(0, k);
+    answer.push(Math.min(...rank));
+  }
+  return answer;
+}
diff --git "a/\353\217\204\354\234\244/week6/[Lv 2] Bracket.js" "b/\353\217\204\354\234\244/week6/[Lv 2] Bracket.js"
new file mode 100644
index 0000000..5c5f379
--- /dev/null
+++ "b/\353\217\204\354\234\244/week6/[Lv 2] Bracket.js"	
@@ -0,0 +1,25 @@
+// Lv 2. 올바른 괄호 - 스택/큐
+function solution(s) {
+  const stack = [];
+
+  for (let i = 0; i < s.length; i++) {
+    stack[stack.length - 1] === "(" && s[i] === ")"
+      ? stack.pop()
+      : stack.push(s[i]);
+  }
+
+  return stack.length === 0 ? true : false;
+}
+
+/*
+효율성 검사 통과 풀이
+function solution(s){
+    const stack = [];
+    
+    for(let i = 0; i < s.length; i++){
+        (stack[stack.length-1] === "(" && s[i] === ")") ? stack.pop() : stack.push(s[i]);
+
+    }
+    
+    return !stack.length;
+} */
diff --git "a/\353\217\204\354\234\244/week6/[Lv 2] PairEliminate.js" "b/\353\217\204\354\234\244/week6/[Lv 2] PairEliminate.js"
new file mode 100644
index 0000000..401608e
--- /dev/null
+++ "b/\353\217\204\354\234\244/week6/[Lv 2] PairEliminate.js"	
@@ -0,0 +1,13 @@
+// Lv 2. 짝지어 제거하기 - 2017 탑스타운
+function solution(s) {
+  //stack 사용
+  const stack = [];
+  for (let i = 0; i < s.length; i++) {
+    if (stack[stack.length - 1] !== s[i]) {
+      stack.push(s[i]);
+    } else {
+      stack.pop();
+    }
+  }
+  return stack.length === 0 ? 1 : 0;
+}
diff --git "a/\353\217\204\354\234\244/week7/[Lv 1] BunchOfCared.js" "b/\353\217\204\354\234\244/week7/[Lv 1] BunchOfCared.js"
new file mode 100644
index 0000000..d527974
--- /dev/null
+++ "b/\353\217\204\354\234\244/week7/[Lv 1] BunchOfCared.js"	
@@ -0,0 +1,16 @@
+// Lv 1. 카드 뭉치 - 연습문제
+function solution(cards1, cards2, goal) {
+  let answer = "";
+  for (let i = 0; i < goal.length; i++) {
+    if (cards1[0] === goal[i]) {
+      cards1.shift();
+    } else if (cards2[0] === goal[i]) {
+      cards2.shift();
+    } else {
+      answer = "No";
+      break;
+    }
+    answer = "Yes";
+  }
+  return answer;
+}
diff --git "a/\353\217\204\354\234\244/week7/[Lv 1] Clothes.js" "b/\353\217\204\354\234\244/week7/[Lv 1] Clothes.js"
new file mode 100644
index 0000000..2612d38
--- /dev/null
+++ "b/\353\217\204\354\234\244/week7/[Lv 1] Clothes.js"	
@@ -0,0 +1,29 @@
+// Lv 1. 체육복 - 탐욕법(Greedy)
+function solution(n, lost, reserve) {
+  //가져왔는데 도난당한 경우 (reserve와 lost에서 모두 제거)
+  let newReserve = reserve
+    .filter((elm) => {
+      return !lost.includes(elm);
+    })
+    .sort((a, b) => a - b);
+
+  let newLost = lost
+    .filter((elm) => {
+      return !reserve.includes(elm);
+    })
+    .sort((a, b) => a - b);
+
+  //answer의 초기값: 총 n명 중 가져오지 않은 사람(가져왔는데 도난당한 사람 제외)
+  let answer = n - newLost.length;
+
+  newLost.forEach((elm) => {
+    if (newReserve && newReserve.includes(elm - 1)) {
+      answer++;
+      newReserve = newReserve.filter((res) => res !== elm - 1);
+    } else if (newReserve && newReserve.includes(elm + 1)) {
+      answer++;
+      newReserve = newReserve.filter((res) => res !== elm + 1);
+    }
+  });
+  return answer;
+}
diff --git "a/\353\217\204\354\234\244/week8/[Lv 1] Babbling(2).js" "b/\353\217\204\354\234\244/week8/[Lv 1] Babbling(2).js"
new file mode 100644
index 0000000..1046db0
--- /dev/null
+++ "b/\353\217\204\354\234\244/week8/[Lv 1] Babbling(2).js"	
@@ -0,0 +1,18 @@
+// Lv 1. 옹알이(2) - 연습문제
+function solution(babbling) {
+  const babblingList = ["aya", "ye", "woo", "ma"];
+  let count = 0;
+
+  for (bab of babbling) {
+    for (word of babblingList) {
+      if (bab.includes(word.repeat(2))) {
+        break;
+      }
+      bab = bab.split(word).join(" ");
+    }
+    if (bab.split(" ").join("").length === 0) {
+      count++;
+    }
+  }
+  return count;
+}
diff --git "a/\353\217\204\354\234\244/week8/[Lv 1] NumberPair.js" "b/\353\217\204\354\234\244/week8/[Lv 1] NumberPair.js"
new file mode 100644
index 0000000..8db9e4a
--- /dev/null
+++ "b/\353\217\204\354\234\244/week8/[Lv 1] NumberPair.js"	
@@ -0,0 +1,27 @@
+// Lv 1. 숫자 짝꿍 - 연습문제 -> 11 ~ 15 시간초과
+function solution(X, Y) {
+  const XArr = X.toString().split("");
+  const YArr = Y.toString().split("");
+  const maxLen = Math.max(XArr.length, YArr.length);
+  const answer = [];
+
+  for (let i = 0; i < maxLen; i++) {
+    const tmp = XArr[i];
+    if (YArr.includes(tmp)) {
+      answer.push(tmp);
+      YArr.splice(YArr.indexOf(tmp), 1);
+    }
+  }
+
+  const answerSet = new Set(answer);
+
+  if (answer.length === 0) {
+    return "-1";
+  }
+  if (answerSet.size === 1 && answerSet.has("0")) {
+    console.log("here");
+    return "0";
+  }
+
+  return answer.sort((a, b) => b - a).join("");
+}
diff --git "a/\353\217\204\354\234\244/week8/[Lv 1] Pokemon.js" "b/\353\217\204\354\234\244/week8/[Lv 1] Pokemon.js"
new file mode 100644
index 0000000..9bc7746
--- /dev/null
+++ "b/\353\217\204\354\234\244/week8/[Lv 1] Pokemon.js"	
@@ -0,0 +1,7 @@
+// Lv 1. 포켓몬 - 해시
+function solution(nums) {
+  const numSets = new Set(nums);
+  const maxCount = Math.floor(nums.length / 2);
+
+  return numSets.size > maxCount ? maxCount : numSets.size;
+}
diff --git "a/\353\217\204\354\234\244/week8/[Lv 1] SelectAndAdd.js" "b/\353\217\204\354\234\244/week8/[Lv 1] SelectAndAdd.js"
new file mode 100644
index 0000000..73211ce
--- /dev/null
+++ "b/\353\217\204\354\234\244/week8/[Lv 1] SelectAndAdd.js"	
@@ -0,0 +1,14 @@
+// Lv 1. 두 개 뽑아서 더하기
+function solution(numbers) {
+  const answer = [];
+  for (let i = 0; i < numbers.length; i++) {
+    for (let j = i + 1; j < numbers.length; j++) {
+      if (!answer.includes(numbers[i] + numbers[j])) {
+        answer.push(numbers[i] + numbers[j]);
+      } else {
+        continue;
+      }
+    }
+  }
+  return answer.sort((a, b) => a - b);
+}
diff --git "a/\353\217\204\354\234\244/week8/[Lv 2] Jump&Teleportation.js" "b/\353\217\204\354\234\244/week8/[Lv 2] Jump&Teleportation.js"
new file mode 100644
index 0000000..dd3182a
--- /dev/null
+++ "b/\353\217\204\354\234\244/week8/[Lv 2] Jump&Teleportation.js"	
@@ -0,0 +1,14 @@
+// Lv 2. 점프와 순간이동 - Summer/Winter Coding(~2018)
+function solution(n) {
+  let use = 0;
+
+  while (n !== 0) {
+    if (n % 2 === 0) {
+      n = n / 2;
+    } else {
+      n--;
+      use++;
+    }
+  }
+  return use;
+}
diff --git "a/\353\217\204\354\234\244/week8/[Lv 2] RescueBoat.js" "b/\353\217\204\354\234\244/week8/[Lv 2] RescueBoat.js"
new file mode 100644
index 0000000..e00c84d
--- /dev/null
+++ "b/\353\217\204\354\234\244/week8/[Lv 2] RescueBoat.js"	
@@ -0,0 +1,12 @@
+// Lv 2. 구명보트 - 탐욕법(Greedy)
+function solution(people, limit) {
+  let count = 0;
+  let j = people.length - 1;
+  people.sort((a, b) => b - a);
+
+  for (let i = 0; i <= j; i++) {
+    people[i] + people[j] <= limit && j--;
+    count++;
+  }
+  return count;
+}
diff --git "a/\353\217\204\354\234\244/week9/[Lv 1] LottoRanking.js" "b/\353\217\204\354\234\244/week9/[Lv 1] LottoRanking.js"
new file mode 100644
index 0000000..40a1ba4
--- /dev/null
+++ "b/\353\217\204\354\234\244/week9/[Lv 1] LottoRanking.js"	
@@ -0,0 +1,40 @@
+// Lv 1. 로또의 최고 순위와 최저 순위 - 2021 Dev-Matching: 웹 백엔드 개발자(상반기)
+const calculateRank = (count) => {
+  switch (count) {
+    case 2:
+      return 5;
+    case 3:
+      return 4;
+    case 4:
+      return 3;
+    case 5:
+      return 2;
+    case 6:
+      return 1;
+    default:
+      return 6;
+  }
+};
+
+function solution(lottos, win_nums) {
+  const new_lottos = lottos.filter((elm) => elm !== 0);
+  const zero_nums = lottos.length - new_lottos.length;
+  let count = 0;
+
+  new_lottos.forEach((num) => {
+    if (win_nums.includes(num)) {
+      win_nums.splice(win_nums.indexOf(num), 1);
+      count++;
+    }
+  });
+
+  let min = 0,
+    max = 0;
+  if (count === 6) {
+    return [1, 1];
+  } else {
+    min = count;
+    max = count + zero_nums;
+    return [calculateRank(max), calculateRank(min)];
+  }
+}
diff --git "a/\353\217\204\354\234\244/week9/[Lv 1] Running.js" "b/\353\217\204\354\234\244/week9/[Lv 1] Running.js"
new file mode 100644
index 0000000..6eb760a
--- /dev/null
+++ "b/\353\217\204\354\234\244/week9/[Lv 1] Running.js"	
@@ -0,0 +1,20 @@
+// Lv 1. 달리기 경주 - 연습문제
+function solution(players, callings) {
+  const original_players = {};
+
+  players.forEach((elm, idx) => {
+    original_players[elm] = idx;
+  });
+
+  for (let i = 0; i < callings.length; i++) {
+    const pre_ranking = original_players[callings[i]]; // 추월하기 전 몇등인지
+    const temp = players[pre_ranking - 1]; // 추월당한 선수의 이름
+
+    players[pre_ranking - 1] = callings[i];
+    original_players[callings[i]] = pre_ranking - 1;
+
+    players[pre_ranking] = temp;
+    original_players[temp] = pre_ranking;
+  }
+  return players;
+}
diff --git "a/\353\217\204\354\234\244/week9/[Lv 1]. DartGame.js" "b/\353\217\204\354\234\244/week9/[Lv 1]. DartGame.js"
new file mode 100644
index 0000000..77836e0
--- /dev/null
+++ "b/\353\217\204\354\234\244/week9/[Lv 1]. DartGame.js"	
@@ -0,0 +1,43 @@
+// Lv 1. [1차]다트게임 - 2018 KAKAO BLIND RECRUITMENT
+function solution(dartResult) {
+  let tmp = 0,
+    answer = [];
+
+  for (let i = 0; i < dartResult.length; i++) {
+    //dartResult[i]가 숫자라면
+    if (!isNaN(dartResult[i])) {
+      if (Number(dartResult[i]) === 1 && Number(dartResult[i + 1]) === 0) {
+        tmp = 10;
+        i++;
+      } else {
+        tmp = dartResult[i];
+      }
+    } else {
+      switch (dartResult[i]) {
+        case "S":
+          answer.push(Math.pow(tmp, 1));
+          continue;
+        case "D":
+          answer.push(Math.pow(tmp, 2));
+          continue;
+        case "T":
+          answer.push(Math.pow(tmp, 3));
+          continue;
+        case "*":
+          answer[answer.length - 1] *= 2;
+          answer[answer.length - 2] *= 2;
+          continue;
+        case "#":
+          answer[answer.length - 1] *= -1;
+          continue;
+      }
+    }
+  }
+
+  let score = 0;
+  answer.forEach((elm) => {
+    score += Number(elm);
+  });
+
+  return score;
+}
diff --git "a/\353\217\204\354\234\244/week9/[Lv 2] Carpet.js" "b/\353\217\204\354\234\244/week9/[Lv 2] Carpet.js"
new file mode 100644
index 0000000..c187da1
--- /dev/null
+++ "b/\353\217\204\354\234\244/week9/[Lv 2] Carpet.js"	
@@ -0,0 +1,20 @@
+// Lv 2. 카펫 - 완전탐색
+function solution(brown, yellow) {
+  let answer = [];
+  const TOTAL_SIZE = brown + yellow;
+  let width, height;
+
+  //yellow 최소 1개 -> 감싸기위해 필요한 brown 3,3
+  for (let i = 3; i < TOTAL_SIZE; i++) {
+    //카펫의 임시 가로, 세로 구하기
+    width = TOTAL_SIZE / i;
+    height = i;
+
+    if (width < height) continue;
+
+    if ((width - 2) * (height - 2) === yellow) {
+      answer.push(width, height);
+    }
+  }
+  return answer;
+}
diff --git "a/\353\217\204\354\234\244/week9/[Lv 2] LastLetterGame.js" "b/\353\217\204\354\234\244/week9/[Lv 2] LastLetterGame.js"
new file mode 100644
index 0000000..701e986
--- /dev/null
+++ "b/\353\217\204\354\234\244/week9/[Lv 2] LastLetterGame.js"	
@@ -0,0 +1,29 @@
+// Lv 2. 영어 끝말잇기 - Summer/Winter Coding(~2018)
+function solution(n, words) {
+  const password = [words[0]];
+  let len = words[0].length;
+  let last_letter = words[0][len - 1];
+  let turn = 1;
+
+  for (let i = 1; i < words.length; i++) {
+    len = words[i].length;
+
+    // 끝말잇기 규칙에 맞는 단어인지 체크
+    if (last_letter !== words[i][0]) {
+      return [(i % n) + 1, turn];
+    }
+
+    // 이미 나온 단어인지 체크
+    if (password.includes(words[i])) {
+      return [(i % n) + 1, turn];
+    }
+
+    password.push(words[i]);
+    last_letter = words[i][len - 1];
+
+    if ((i % n) + 1 === n) {
+      turn++;
+    }
+  }
+  return [0, 0];
+}
diff --git "a/\353\217\204\354\234\244/week9/[Lv 2] Tournament.js" "b/\353\217\204\354\234\244/week9/[Lv 2] Tournament.js"
new file mode 100644
index 0000000..328f380
--- /dev/null
+++ "b/\353\217\204\354\234\244/week9/[Lv 2] Tournament.js"	
@@ -0,0 +1,17 @@
+// Lv 2. 예상 대진표 - 2017 팁스다운
+function solution(n, a, b) {
+  let round = 0;
+
+  let newA = Math.min(a, b);
+  let newB = Math.max(a, b);
+
+  //Math.round를 했을 때 최종으로 나오는 값은 1이기 때문
+  while (newA !== newB) {
+    newA = Math.round(newA / 2);
+    newB = Math.round(newB / 2);
+    round++;
+  }
+
+  return round;
+}
+ㅍ;