diff --git a/src/week2/BOJ2852/BOJ2852_V1.cpp b/src/week2/BOJ2852/BOJ2852_V1.cpp
new file mode 100644
index 0000000..64f9a40
--- /dev/null
+++ b/src/week2/BOJ2852/BOJ2852_V1.cpp
@@ -0,0 +1,106 @@
+#include <bits/stdc++.h>
+using namespace std;
+int N;
+int score[2];
+string getWinningTime(string st_time, string ed_time){
+    int st_time_minutes = atoi(st_time.substr(0,2).c_str());
+    int ed_time_minutes = atoi(ed_time.substr(0,2).c_str());
+    int st_time_seconds = atoi(st_time.substr(3,2).c_str());
+    int ed_time_seconds = atoi(ed_time.substr(3,2).c_str());
+
+    int ret_minutes = ed_time_minutes - st_time_minutes;
+    int ret_seconds;
+    if (st_time_seconds > ed_time_seconds) {
+        ret_minutes -= 1;
+        ret_seconds = ed_time_seconds + 60 - st_time_seconds;
+    } else {
+        ret_seconds = ed_time_seconds - st_time_seconds;
+    }
+
+    string ret_minutes_str = to_string(ret_minutes);
+    string ret_seconds_str = to_string(ret_seconds);
+
+    if (ret_minutes >= 0 && ret_minutes <= 9)
+        ret_minutes_str = "0" + to_string(ret_minutes);
+    if (ret_seconds >= 0 && ret_seconds <= 9)
+        ret_seconds_str = "0" + to_string(ret_seconds);
+
+    return ret_minutes_str + ":" + ret_seconds_str;
+}
+void addWinningTime(string &target_winning_time, string time){
+    int target_time_minutes = atoi(target_winning_time.substr(0,2).c_str());
+    int plus_time_minutes = atoi(time.substr(0,2).c_str());
+    int target_time_seconds = atoi(target_winning_time.substr(3,2).c_str());
+    int plus_time_seconds = atoi(time.substr(3,2).c_str());
+
+    int ret_minutes = target_time_minutes + plus_time_minutes;
+    int ret_seconds = target_time_seconds + plus_time_seconds;
+    if (ret_seconds > 60) {
+        ret_minutes += 1;
+        ret_seconds -= 60;
+    }
+
+    string ret_minutes_str = to_string(ret_minutes);
+    string ret_seconds_str = to_string(ret_seconds);
+
+    if (ret_minutes >= 0 && ret_minutes <= 9)
+        ret_minutes_str = "0" + to_string(ret_minutes);
+    if (ret_seconds >= 0 && ret_seconds <= 9)
+        ret_seconds_str = "0" + to_string(ret_seconds);
+
+    target_winning_time = ret_minutes_str + ":" + ret_seconds_str;
+}
+string team1_winning_time = "00:00";
+string team2_winning_time = "00:00";
+int main() {
+    ios_base::sync_with_stdio(false);
+    cin.tie(NULL);
+    cout.tie(NULL);
+
+    cin >> N;
+    int before_winning_team = -1;
+    string before_winning_start_time;
+    string current_time;
+    string current_winning_time;
+    for (int i = 0; i < N; i++) {
+        int team;
+
+        cin >> team >> current_time;
+
+        score[team - 1]++;
+
+        if (score[0] == score[1]) {
+            if (before_winning_team == 1) {
+                current_winning_time = getWinningTime(before_winning_start_time, current_time);
+                addWinningTime(team1_winning_time, current_winning_time);
+                before_winning_team = -1;
+            } else if (before_winning_team == 2) {
+                current_winning_time = getWinningTime(before_winning_start_time, current_time);
+                addWinningTime(team2_winning_time, current_winning_time);
+                before_winning_team = -1;
+            }
+        } else {
+            if (score[0] > score[1] && before_winning_team != 1) {
+                before_winning_team = 1;
+                before_winning_start_time = current_time;
+            } else if (score[0] < score[1] && before_winning_team != 2) {
+                before_winning_team = 2;
+                before_winning_start_time = current_time;
+            }
+        }
+    }
+
+    if (before_winning_team == 1) {
+        current_winning_time = getWinningTime(before_winning_start_time, "48:00");
+        addWinningTime(team1_winning_time, current_winning_time);
+    } else if (before_winning_team == 2) {
+        current_winning_time = getWinningTime(before_winning_start_time, "48:00");
+        addWinningTime(team2_winning_time, current_winning_time);
+    }
+
+    cout << team1_winning_time << "\n" <<  team2_winning_time;
+
+
+
+    return 0;
+}
\ No newline at end of file
diff --git a/src/week2/BOJ2852/BOJ2852_V2.cpp b/src/week2/BOJ2852/BOJ2852_V2.cpp
new file mode 100644
index 0000000..0eb7e6f
--- /dev/null
+++ b/src/week2/BOJ2852/BOJ2852_V2.cpp
@@ -0,0 +1,63 @@
+#include <bits/stdc++.h>
+using namespace std;
+int N;
+int team_1_winning_time;
+int team_2_winning_time;
+void calculate_winning_time(string st, string ed, int &winning_team) {
+    int st_time_minutes = atoi(st.substr(0,2).c_str());
+    int ed_time_minutes = atoi(ed.substr(0,2).c_str());
+    int st_time_seconds = atoi(st.substr(3,2).c_str());
+    int ed_time_seconds = atoi(ed.substr(3,2).c_str());
+
+    st_time_seconds += 60 * st_time_minutes;
+    ed_time_seconds += 60 * ed_time_minutes;
+
+    winning_team += (ed_time_seconds - st_time_seconds);
+}
+string make_time(int seconds){
+    int minutes = seconds / 60;
+    seconds = seconds % 60;
+    string minutes_str = "";
+    string seconds_str = "";
+    minutes_str = to_string(minutes);
+    seconds_str = to_string(seconds);
+
+    if (minutes >= 0 && minutes <= 9) {
+        minutes_str = "0" +  to_string(minutes);
+    }
+    if (seconds >= 0 && seconds <= 9) {
+        seconds_str = "0" + to_string(seconds);
+    }
+
+    return minutes_str + ":" + seconds_str;
+}
+int main() {
+
+    cin >> N;
+    int score[2] = {0, 0};
+    string prev_time;
+    for (int i = 0; i < N; i++) {
+        int team;
+        string time;
+        cin >> team >> time;
+        if (score[1] > score[0]) {
+            calculate_winning_time(prev_time,time, team_2_winning_time);
+        }
+        if (score[0] > score[1]) {
+            calculate_winning_time(prev_time,time, team_1_winning_time);
+        }
+        score[team-1]++;
+        prev_time = time;
+    }
+
+    if (score[1] > score[0]) {
+        calculate_winning_time(prev_time,"48:00", team_2_winning_time);
+    }
+    if (score[0] > score[1]) {
+        calculate_winning_time(prev_time,"48:00", team_1_winning_time);
+    }
+
+    cout << make_time(team_1_winning_time) << "\n" << make_time(team_2_winning_time);
+
+    return 0;
+}
\ No newline at end of file