diff --git "a/9\354\233\224 15\354\235\274 - \354\212\244\355\203\235, \355\201\220, \353\215\261/10866.cpp" "b/9\354\233\224 15\354\235\274 - \354\212\244\355\203\235, \355\201\220, \353\215\261/10866.cpp"
new file mode 100644
index 0000000..31fe4ee
--- /dev/null
+++ "b/9\354\233\224 15\354\235\274 - \354\212\244\355\203\235, \355\201\220, \353\215\261/10866.cpp"	
@@ -0,0 +1,113 @@
+#include <iostream>
+#include <queue>
+
+using namespace std;
+const int SIZE = 10001;
+
+int front_pointer = 0, rear_pointer = 0;
+vector<int> deque_vec(SIZE);
+
+bool empty(){
+    return front_pointer == rear_pointer;
+}
+
+void push_front(int k){
+    front_pointer = (front_pointer+1) % SIZE;
+    deque_vec[front_pointer] = k;
+}
+
+void push_back(int k){
+    rear_pointer = (rear_pointer+1) % SIZE;
+    deque_vec[rear_pointer] = k;
+}
+
+int pop_front(){
+    front_pointer = (front_pointer + 1) % SIZE;
+    return deque_vec[front_pointer];
+}
+
+int pop_back(){
+    rear_pointer = (rear_pointer + 1) % SIZE;
+    return deque_vec[rear_pointer];
+}
+
+int size(){
+    int tmp = (rear_pointer - front_pointer);
+    if(tmp < 0){
+        tmp += SIZE;
+    }
+    return tmp;
+}
+
+int front() {
+    int tmp = (front_pointer + 1) % SIZE;
+    return deque_vec[tmp];
+}
+
+int back() {
+    return deque_vec[rear_pointer];
+}
+
+int main(){
+    int n, k;
+    string cmd;
+    deque<int> dq;
+
+    cin >> n ;
+    while(n--){
+        cin >> cmd;
+        if(cmd == "push_front"){
+            cin >> k;
+            dq.push_front(k);
+            continue;
+        }
+        if(cmd == "push_back"){
+            cin >> k;
+            dq.push_back(k);
+            continue;
+        }
+        if(cmd == "pop_back"){
+            if(dq.empty())
+                cout << -1 << '\n';
+            else{
+                cout << dq.back() << '\n';
+                dq.pop_back();
+            }
+            continue;
+        }
+        if(cmd == "pop_front"){
+            if(dq.empty())
+                cout << -1 << '\n';
+            else{
+                cout << dq.front() << '\n';
+                dq.pop_front();
+            }
+            continue;
+        }
+        if(cmd == "size"){
+            cout << dq.size() << '\n';
+            continue;
+        }
+        if(cmd == "empty"){
+            cout << dq.empty() << '\n';
+            continue;
+        }
+        if(cmd == "front"){
+            if(dq.empty())
+                cout << -1 << '\n';
+            else{
+                cout << dq.front() << '\n';
+            }
+            continue;
+        }
+        if(cmd == "back"){
+            if(dq.empty())
+                cout << -1 << '\n';
+            else{
+                cout << dq.back() << '\n';
+            }
+            continue;
+        }
+    }
+
+}
\ No newline at end of file
diff --git "a/9\354\233\224 15\354\235\274 - \354\212\244\355\203\235, \355\201\220, \353\215\261/1935.cpp" "b/9\354\233\224 15\354\235\274 - \354\212\244\355\203\235, \355\201\220, \353\215\261/1935.cpp"
new file mode 100644
index 0000000..8cfbee7
--- /dev/null
+++ "b/9\354\233\224 15\354\235\274 - \354\212\244\355\203\235, \355\201\220, \353\215\261/1935.cpp"	
@@ -0,0 +1,66 @@
+
+#include <iostream>
+#include <vector>
+#include <map>
+#include <stack>
+
+using namespace std;
+
+int main() {
+    int n;
+    cin >> n;
+
+    string s;
+    cin >> s;
+
+    //피연산자의 값 입력
+    double t;
+    map<char, double> value;
+    for (int i = 0; i < n; i++) {
+        cin >> t;
+        value['A' + i] = t;
+    }
+
+    stack<double> st;
+
+    for(int i=0; i<s.length(); i++){
+        double a, b;
+        char c = s[i];
+        if(c >= 'A' && c <='Z'){
+            st.push(value[c]);
+        }
+        else if(c == '*'){
+            a = st.top();
+            st.pop();
+            b = st.top();
+            st.pop();
+            st.push(a*b);
+        }
+        else if(c == '+'){
+            a = st.top();
+            st.pop();
+            b = st.top();
+            st.pop();
+            st.push(a+b);
+        }
+        else if(c == '/'){
+            a = st.top();
+            st.pop();
+            b = st.top();
+            st.pop();
+            st.push(b/a);
+        }
+        else if(c == '-'){
+            a = st.top();
+            st.pop();
+            b = st.top();
+            st.pop();
+            st.push(b-a);
+        }
+    }
+
+    cout << fixed;
+    cout.precision(2);
+    cout << st.top();
+
+}
\ No newline at end of file
diff --git "a/9\354\233\224 15\354\235\274 - \354\212\244\355\203\235, \355\201\220, \353\215\261/20920.cpp" "b/9\354\233\224 15\354\235\274 - \354\212\244\355\203\235, \355\201\220, \353\215\261/20920.cpp"
new file mode 100644
index 0000000..914c82b
--- /dev/null
+++ "b/9\354\233\224 15\354\235\274 - \354\212\244\355\203\235, \355\201\220, \353\215\261/20920.cpp"	
@@ -0,0 +1,40 @@
+
+#include <iostream>
+#include <vector>
+#include <map>
+#include <algorithm>
+
+using namespace std;
+
+bool cmp(const pair<string, int> &i1, const pair<string, int> &i2){
+    if(i1.second != i2.second)
+        return i1.second > i2.second;
+    if(i1.first.size() != i2.first.size())
+        return i1.first.size() > i2.first.size();
+    return i1.first < i2.first;
+}
+int main(){
+
+    int n, len;
+    cin >> n >> len;
+
+    //맵에 단어와 횟수를 입력
+    map<string, int> word;
+    for(int i=0; i<n; i++){
+        string s;
+        cin >> s;
+        if(s.length() >= len)
+            word[s]++;
+    }
+
+    //벡터에 맵 입력
+    vector<pair<string, int>> answer(word.begin(), word.end());
+    //정렬
+    sort(answer.begin(), answer.end(), cmp);
+
+    //출력
+    for(int i=0; i<answer.size(); i++){
+        cout << answer[i].first << '\n';
+    }
+
+}
diff --git "a/9\354\233\224 15\354\235\274 - \354\212\244\355\203\235, \355\201\220, \353\215\261/crane.cpp" "b/9\354\233\224 15\354\235\274 - \354\212\244\355\203\235, \355\201\220, \353\215\261/crane.cpp"
new file mode 100644
index 0000000..e9ca071
--- /dev/null
+++ "b/9\354\233\224 15\354\235\274 - \354\212\244\355\203\235, \355\201\220, \353\215\261/crane.cpp"	
@@ -0,0 +1,57 @@
+
+#include <iostream>
+#include <vector>
+#include <stack>
+
+using namespace std;
+
+int solution(vector<vector<int>> board, vector<int> moves) {
+    int answer = 0;
+    int n = board.size();
+    vector<stack<int>> doll(n);
+
+    //스택에 인형 종류 입력
+    for(int i=n-1; i>=0; i--){
+        for(int j=0; j<n; j++){
+            if(board[i][j] != 0)
+                doll[j].push(board[i][j]);
+        }
+    }
+
+    stack<int> moved;
+    int prev = 0;
+    //인형 옮기기
+    for(int move : moves){
+        if(doll[move-1].empty())
+            continue;
+        int k = doll[move-1].top();
+        doll[move-1].pop();
+        if(k==prev){ //연속해서 쌓였다면
+            moved.pop();
+            //바구니가 비지 않았다면 마지막 값 입력, 비었다면 0 입력
+            if(!moved.empty()){
+                prev = moved.top();
+            }
+            else{
+                prev = 0;
+            }
+            answer += 2;
+        }
+        else{
+            moved.push(k);
+            prev = k;
+        }
+    }
+
+    return answer;
+}
+
+int main() {
+    vector<vector<int>> board = {{0, 0, 0, 0, 0},
+                                 {0, 0, 1, 0, 3},
+                                 {0, 2, 5, 0, 1},
+                                 {4, 2, 4, 4, 2},
+                                 {3, 5, 1, 3, 1}};
+    vector<int> moves = {1, 5, 3, 5, 1, 2, 1, 4};
+    cout << solution(board, moves);
+}
\ No newline at end of file