diff --git a/Jiho/Day27/Leetcode_40. Combination Sum II.js b/Jiho/Day27/Leetcode_40. Combination Sum II.js
new file mode 100644
index 0000000..fcddb0c
--- /dev/null
+++ b/Jiho/Day27/Leetcode_40. Combination Sum II.js	
@@ -0,0 +1,109 @@
+var combinationSum2 = function (candidates, target) {
+  const len = candidates.length;
+  const totalSum = getSum(candidates);
+  let answer = [];
+  const DFS = (index, arr, sum, leftOver) => {
+    if (sum === target) {
+      // 같은거 포함 여부 확인
+      const targetMap = getMap(arr);
+      let sameExist = false;
+      answer.forEach((ans) => {
+        if (isIdentical(getMap(ans), targetMap)) {
+          sameExist = true;
+        }
+      });
+      !sameExist ? answer.push(arr) : undefined;
+      return;
+    } else if (index >= len || sum > target || sum + leftOver < target) {
+      return;
+    }
+    // 포함X
+    DFS(index + 1, [...arr], sum, leftOver - candidates[index]);
+    // 포함O
+    arr.push(candidates[index]);
+    DFS(
+      index + 1,
+      [...arr],
+      sum + candidates[index],
+      leftOver - candidates[index]
+    );
+  };
+
+  DFS(0, [], 0, totalSum);
+  return answer;
+};
+
+function isIdentical(iMap, tMap) {
+  if (iMap.size !== tMap.size) {
+    return false;
+  }
+  for (let [key, value] of iMap) {
+    if (tMap.has(key)) {
+      if (value !== tMap.get(key)) {
+        return false;
+      }
+    } else {
+      return false;
+    }
+  }
+
+  return true;
+}
+
+function getMap(array) {
+  const map = new Map();
+  for (const elm of array) {
+    map.set(elm, (map.get(elm) | 0) + 1);
+  }
+  return map;
+}
+function getSum(array) {
+  let sum = 0;
+  for (let i = 0; i < array.length; i++) sum += array[i];
+  return sum;
+}
+
+var combinationSumAns = function (candidates, target) {
+  candidates.sort((a, b) => a - b);
+  const res = [];
+
+  function dfs(target, start, comb) {
+    if (target < 0) {
+      return;
+    }
+
+    if (target === 0) {
+      res.push(comb.slice());
+      return;
+    }
+
+    for (let i = start; i < candidates.length; i++) {
+      if (i > start && candidates[i] === candidates[i - 1]) {
+        continue;
+      }
+
+      if (candidates[i] > target) {
+        break;
+      }
+
+      dfs(target - candidates[i], i + 1, comb.concat(candidates[i]));
+    }
+  }
+
+  dfs(target, 0, []);
+  return res;
+};
+
+console.log(
+  combinationSumAns(
+    [
+      1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+      1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+      1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+      1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+    ],
+    30
+  )
+);
+// console.log(combinationSum2([10, 1, 2, 7, 6, 1, 5], 8));
+// console.log(combinationSum2([2, 5, 2, 1, 2], 5));
diff --git "a/Jiho/Day27/\353\260\261\354\244\200_1388_\353\260\224\353\213\245 \354\236\245\354\213\235.js" "b/Jiho/Day27/\353\260\261\354\244\200_1388_\353\260\224\353\213\245 \354\236\245\354\213\235.js"
new file mode 100644
index 0000000..1d7c0de
--- /dev/null
+++ "b/Jiho/Day27/\353\260\261\354\244\200_1388_\353\260\224\353\213\245 \354\236\245\354\213\235.js"	
@@ -0,0 +1,62 @@
+const fs = require("fs");
+const input = fs
+  .readFileSync(process.platform === "linux" ? "/dev/stdin" : "../input.txt")
+  .toString()
+  .trim()
+  .split("\n");
+
+// 입력 받기
+const [height, width] = input.shift()?.split(" ").map(Number);
+const arr = Array.from(Array(height), () => new Array(width));
+
+for (let row = 0; row < height; row++) {
+  const rowInput = input[row];
+  for (let col = 0; col < width; col++) {
+    arr[row][col] = rowInput[col];
+  }
+}
+
+const BFS = (startRow, startCol, visited) => {
+  const queue = [[startRow, startCol]];
+  while (queue.length) {
+    const [row, col] = queue.shift();
+
+    const val = arr[row][col];
+    //
+    if (val === "-") {
+      if (
+        col + 1 < width &&
+        arr[row][col + 1] === "-" &&
+        !visited[row][col + 1]
+      ) {
+        visited[row][col + 1] = true;
+        queue.push([row, col + 1]);
+      }
+    }
+    //
+    else if (val === "|") {
+      if (
+        row + 1 < height &&
+        arr[row + 1][col] === "|" &&
+        !visited[row + 1][col]
+      ) {
+        visited[row + 1][col] = true;
+        queue.push([row + 1, col]);
+      }
+    }
+  }
+};
+
+let answer = 0;
+let visited = Array.from(Array(height), () => new Array(width).fill(false));
+for (let i = 0; i < height; i++) {
+  for (let j = 0; j < width; j++) {
+    if (!visited[i][j]) {
+      answer++;
+      visited[i][j] = true;
+      BFS(i, j, visited);
+    }
+  }
+}
+
+console.log(answer);
diff --git a/Jiho/Day28/Leetcode_70. Climbing Stairs.js b/Jiho/Day28/Leetcode_70. Climbing Stairs.js
new file mode 100644
index 0000000..f72967c
--- /dev/null
+++ b/Jiho/Day28/Leetcode_70. Climbing Stairs.js	
@@ -0,0 +1,11 @@
+var climbStairs = function (n) {
+  let arr = new Array(n + 1);
+  arr[1] = 1;
+  arr[2] = 2;
+  for (let i = 3; i <= n; i++) {
+    arr[i] = arr[i - 1] + arr[i - 2];
+  }
+  return arr[n];
+};
+
+console.log(climbStairs(10));
diff --git a/Jiho/Day28/Leetcode_746. Min Cost Climbing Stairs.js b/Jiho/Day28/Leetcode_746. Min Cost Climbing Stairs.js
new file mode 100644
index 0000000..3492434
--- /dev/null
+++ b/Jiho/Day28/Leetcode_746. Min Cost Climbing Stairs.js	
@@ -0,0 +1,7 @@
+var minCostClimbingStairs = function (cost) {
+  for (let i = cost.length - 3; i >= 0; i--) {
+    cost[i] += Math.min(cost[i + 1], cost[i + 2]);
+  }
+
+  return Math.min(cost[0], cost[1]);
+};