diff --git a/kangrae-jo/.DS_Store b/kangrae-jo/.DS_Store
index cffb731..c024126 100644
Binary files a/kangrae-jo/.DS_Store and b/kangrae-jo/.DS_Store differ
diff --git a/kangrae-jo/.gitignore b/kangrae-jo/.gitignore
new file mode 100644
index 0000000..e43b0f9
--- /dev/null
+++ b/kangrae-jo/.gitignore
@@ -0,0 +1 @@
+.DS_Store
diff --git a/kangrae-jo/BFS/4-kangrae-jo.cpp b/kangrae-jo/BFS/4-kangrae-jo.cpp
new file mode 100644
index 0000000..391173e
--- /dev/null
+++ b/kangrae-jo/BFS/4-kangrae-jo.cpp
@@ -0,0 +1,76 @@
+#include <queue>
+#include <string>
+#include <vector>
+
+using namespace std;
+
+#define EMPTY 0
+#define PATH 1
+#define WALL 2
+#define VISITED 3
+
+int offset[4][2] = {{1, 0}, {0, 1}, {-1, 0}, {0, -1}};
+int board[102][102] = {EMPTY,};
+
+queue<pair<int, int>> q;
+
+bool check(int cX, int cY, int itemX, int itemY) {
+    if (cX == itemX && cY == itemY) return true;
+    else return false;
+}
+bool isMoveable(int cX_, int cY_) {
+    if (cX_ < 0 || cX_ > 100 || cY_ < 0 || cY_ > 100) return false;
+    if (board[cY_][cX_] == PATH) return true;
+    else return false;
+}
+int move(int cX, int cY, int dir) {
+    int cY_ = cY + offset[dir][0];
+    int cX_ = cX + offset[dir][1];
+
+    if (isMoveable(cX_, cY_)) q.push(make_pair(cY_, cX_));
+
+    return 0;
+}
+
+int solution(vector<vector<int>> rectangle, int characterX, int characterY, int itemX, int itemY) {
+    int answer = 0;
+
+    // init
+    for (auto& i : rectangle) {
+        int x1 = i[0]*2, x2 = i[2]*2;
+        int y1 = i[1]*2, y2 = i[3]*2;
+        for (int y = y1; y <= y2; y++) {
+            for (int x = x1; x <= x2; x++) {
+                if (board[y][x] == WALL) continue;
+                else if (y == y1 || y == y2 || x == x1 || x == x2) board[y][x] = PATH;
+                else board[y][x] = WALL;
+            }
+        }
+    }
+    characterX *= 2;
+    characterY *= 2;
+    itemX *= 2;
+    itemY *= 2;
+    
+    // BFS
+    q.push(make_pair(characterY, characterX));
+
+    while (!q.empty()) {
+        int size = q.size();
+
+        while (size--){
+            int cY = q.front().first;
+            int cX = q.front().second;
+    
+            board[cY][cX] = VISITED;
+            q.pop();
+    
+            if (check(cX, cY, itemX, itemY)) return answer / 2;
+    
+            for (int dir = 0; dir < 4; dir++) move(cX, cY, dir);
+        }
+        answer++;
+    }
+
+    return answer / 2;
+}
\ No newline at end of file
diff --git a/kangrae-jo/DP/5-kangrae-jo.cpp b/kangrae-jo/DP/5-kangrae-jo.cpp
new file mode 100644
index 0000000..95fda12
--- /dev/null
+++ b/kangrae-jo/DP/5-kangrae-jo.cpp
@@ -0,0 +1,51 @@
+#include <iostream>
+#include <algorithm>
+
+using namespace std;
+
+int field[1001][1001];
+int maxX=0, maxY=0;
+int minX=1001, minY=1001;
+
+int main() {
+	ios::sync_with_stdio(0);
+	cin.tie(0);
+	cout.tie(0);
+	
+	int N, K;
+	cin >> N >> K;
+	
+	int x1,y1,x2,y2;
+
+	for (int i=0; i<N; i++){
+		cin >> x1 >> y1 >> x2 >> y2;
+
+		
+		minX=min(minX,x1);
+		minY=min(minY,y1);
+		maxX=max(maxX,x2);
+		maxY=max(maxY,y2);
+		
+		field[y1][x1] += 1;
+		field[y1][x2] -= 1;
+		field[y2][x1] -= 1;
+		field[y2][x2] += 1;
+	}
+	
+	for(int y=minY; y<=maxY; y++)
+		for (int x=minX; x<=maxX; x++)
+			field[y][x+1] += field[y][x];
+
+	for (int x=minX; x<=maxX; x++)
+		for(int y=minY; y<=maxY; y++)
+			field[y+1][x] += field[y][x];
+	
+	int result = 0;
+	for(int y=minY; y<=maxY; y++)
+		for (int x=minX; x<=maxX; x++)
+			if (field[y][x] == K) result++;
+	
+	cout << result;
+
+	return 0;
+}
\ No newline at end of file
diff --git a/kangrae-jo/README.md b/kangrae-jo/README.md
index 16c0ace..f77ffdf 100644
--- a/kangrae-jo/README.md
+++ b/kangrae-jo/README.md
@@ -3,4 +3,7 @@
 | 차시 |    날짜    | 문제유형 | 링크 | 풀이 |
 |:----:|:---------:|:----:|:-----:|:----:|
 | 1차시 | 2024.09.28 |  DP  | [연속합](https://www.acmicpc.net/problem/1912)|[#2]https://github.com/AlgoLeadMe/AlgoLeadMe-12/pull/2|
+| 4차시 | 2024.10.05 |  BFS  | [아이템 줍기](https://school.programmers.co.kr/learn/courses/30/lessons/87694)|[#12]https://github.com/AlgoLeadMe/AlgoLeadMe-12/pull/12|
+| 5차시 | 2024.11.02 |  DP  | [경쟁 배타의 원리](https://level.goorm.io/exam/162070/%EA%B2%BD%EC%9F%81-%EB%B0%B0%ED%83%80%EC%9D%98-%EC%9B%90%EB%A6%AC/quiz/1)|[#18]https://github.com/AlgoLeadMe/AlgoLeadMe-12/pull/18|
+
 ---