diff --git a/code_study/Baekjoon/c/2805.c b/code_study/Baekjoon/c/2805.c
new file mode 100644
index 0000000..c82b01f
--- /dev/null
+++ b/code_study/Baekjoon/c/2805.c
@@ -0,0 +1,41 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+long long cutTree(const int* tree, int treeNum, int cuttingHeight);
+
+int main(){
+    int N, M;
+    scanf("%d %d",&N, &M);
+    int* tree = (int*)malloc(sizeof(int)*N);
+    int maxHeight = 0;
+    for(int i=0; i<N; i++){
+        scanf("%d",&tree[i]);
+        if(maxHeight<tree[i]) maxHeight = tree[i];
+    }
+
+    int start = 0, end = maxHeight;
+    int optimalHeight = 0;
+    while(start <= end){
+        int midHeight = start + (end - start) / 2; // (start + end) / 2 의 오버플로우 방지 형태
+        long long cutAmount = cutTree(tree,N,midHeight);
+        if(cutAmount<M) end = midHeight - 1;
+        else {
+            optimalHeight = midHeight;
+            start = midHeight + 1;
+        }
+    }
+    
+    printf("%d\n",optimalHeight);
+    free(tree);
+    return 0;
+}
+
+long long cutTree(const int* tree, int treeNum, int cuttingHeight) {
+    long long totalCut = 0;
+    for(int i = 0; i < treeNum; i++){
+        if (tree[i] > cuttingHeight) {
+            totalCut += tree[i] - cuttingHeight;
+        }
+    }
+    return totalCut;
+}
diff --git a/code_study/Baekjoon/java/_11279.java b/code_study/Baekjoon/java/_11279.java
new file mode 100644
index 0000000..6597cd4
--- /dev/null
+++ b/code_study/Baekjoon/java/_11279.java
@@ -0,0 +1,20 @@
+import java.util.*;
+
+public class _11279{
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        int N = sc.nextInt();
+        PriorityQueue<Integer> maxHeap = new PriorityQueue<>(Comparator.reverseOrder());
+        for(int i=0; i<N; i++){
+            int input = sc.nextInt();
+            if(input==0){
+                if(maxHeap.isEmpty()) System.out.println(0);
+                else System.out.println(maxHeap.poll());
+            }
+            else {
+                maxHeap.offer(input);
+            }
+        }
+        sc.close();
+    }
+}
\ No newline at end of file
diff --git a/code_study/Baekjoon/python/2630.py b/code_study/Baekjoon/python/2630.py
new file mode 100644
index 0000000..8acd23a
--- /dev/null
+++ b/code_study/Baekjoon/python/2630.py
@@ -0,0 +1,32 @@
+def DaC(paper) :
+    n = len(paper)
+    firstColor = paper[0][0]
+    isMixed = False
+    for i in range(n):
+        for j in range(n):
+            if paper[i][j] != firstColor :
+                isMixed = True
+                break
+        if isMixed :
+            break
+    
+    if not isMixed :
+        if firstColor == 0 :
+            return (1,0)
+        else :
+            return (0,1)
+    
+    half = n//2
+    area1 = [row[0:half] for row in paper[0:half]]
+    area2 = [row[half:n] for row in paper[0:half]]
+    area3 = [row[0:half] for row in paper[half:n]]
+    area4 = [row[half:n] for row in paper[half:n]]
+    w1, b1 = DaC(area1)
+    w2, b2 = DaC(area2)
+    w3, b3 = DaC(area3)
+    w4, b4 = DaC(area4)
+    
+    return (w1+w2+w3+w4, b1+b2+b3+b4)
+
+paper = [list(map(int, input().split())) for _ in range(int(input()))]
+print('\n'.join(map(str,DaC(paper))))