diff --git a/chaehyun/2025-12-20_baekjoon_10026.cpp b/chaehyun/2025-12-20_baekjoon_10026.cpp
new file mode 100644
index 0000000..49fdec3
--- /dev/null
+++ b/chaehyun/2025-12-20_baekjoon_10026.cpp
@@ -0,0 +1,108 @@
+//
+//  2025-12-20_baekjoon_10026.cpp
+//  algorithm
+//
+//  Created by 김채현 on 12/20/25.
+//
+
+#include <iostream>
+#include <queue>
+#include <vector>
+
+using namespace std;
+
+int n;
+vector<string> board;
+bool visited_normal[101][101];
+bool visited_colorblind[101][101];
+int dx[4] = {1, -1, 0, 0};
+int dy[4] = {0, 0, 1, -1};
+
+void bfs_normal(int x, int y) {
+    queue<pair<int, int>> q;
+    char color;
+    
+    q.push({x, y});
+    visited_normal[x][y] = true;
+    color = board[x][y];
+    
+    while(!q.empty()) {
+        auto cur = q.front();
+        q.pop();
+        
+        for(int i = 0; i < 4; i++) {
+            int nx = cur.first + dx[i];
+            int ny = cur.second + dy[i];
+            
+            if(nx < 0 || ny < 0 || nx > n || ny > n) continue;
+            if(visited_normal[nx][ny]) continue;
+            if(board[nx][ny] != color) continue;
+            
+            q.push({nx, ny});
+            visited_normal[nx][ny] = true;
+        }
+    }
+}
+
+void bfs_colorblind(int x, int y) {
+    queue<pair<int, int>> q;
+    char color;
+    bool flag = false;
+    
+    q.push({x, y});
+    visited_colorblind[x][y] = true;
+    color = board[x][y];
+    
+    if(color == 'R' || color == 'G') flag = true;
+    
+    while(!q.empty()) {
+        auto cur = q.front();
+        q.pop();
+        
+        for(int i = 0; i < 4; i++) {
+            int nx = cur.first + dx[i];
+            int ny = cur.second + dy[i];
+            
+            if(nx < 0 || ny < 0 || nx > n || ny > n) continue;
+            if(visited_colorblind[nx][ny]) continue;
+            if(flag == true && board[nx][ny] == 'B') continue;
+            if(flag == false && board[nx][ny] != color) continue;
+            
+            q.push({nx, ny});
+            visited_colorblind[nx][ny] = true;
+        }
+    }
+}
+
+int main(void) {
+    int normal = 0;
+    int colorblind = 0;
+    
+    cin >> n;
+    
+    board.resize(n);
+    
+    for(int i = 0; i < n; i++) cin >> board[i];
+    
+    for(int i = 0; i < n; i++) {
+        for(int j = 0; j < n; j++) {
+            if(!visited_normal[i][j]) {
+                bfs_normal(i, j);
+                normal++;
+            }
+        }
+    }
+    
+    for(int i = 0; i < n; i++) {
+        for(int j = 0; j < n; j++) {
+            if(!visited_colorblind[i][j]) {
+                bfs_colorblind(i, j);
+                colorblind++;
+            }
+        }
+    }
+    
+    cout << normal << " " << colorblind;
+    
+    return 0;
+}