diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7543c5a..5577c6c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -37,4 +37,10 @@ set(CMAKE_CXX_STANDARD 17)
 #add_executable(timus_cpp task_1585.cpp)
 #add_executable(timus_cpp task_1263.cpp)
 #add_executable(timus_cpp task_1991.cpp)
-add_executable(timus_cpp task_1100.cpp)
+#add_executable(timus_cpp task_1100.cpp)
+
+# homework 08
+#add_executable(timus_cpp task_1545.cpp)
+#add_executable(timus_cpp task_1496.cpp)
+add_executable(timus_cpp task_1196.cpp)
+#add_executable(timus_cpp task_1837.cpp)
diff --git a/task_1196.cpp b/task_1196.cpp
new file mode 100644
index 0000000..e3c3856
--- /dev/null
+++ b/task_1196.cpp
@@ -0,0 +1,32 @@
+#include <iostream>
+#include <algorithm>
+#include <unordered_set>
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    // unordered_set: 0.265 with sync_with_stdio(false), TL without
+    // set: 0.343 with sync_with_stdio(false), TL without
+    size_t num_professor_dates;
+    std::cin >> num_professor_dates;
+
+    std::unordered_set<int> professor_dates;
+    professor_dates.reserve(num_professor_dates);
+    int current_date;
+    for (size_t i = 0; i < num_professor_dates; i++) {
+        std::cin >> current_date;
+        professor_dates.insert(current_date);
+    }
+
+    size_t num_student_dates;
+    size_t num_dates_in_all_lists = 0;
+    std::cin >> num_student_dates;
+    for (size_t i = 0; i < num_student_dates; i++) {
+        std::cin >> current_date;
+        if (professor_dates.count(current_date) > 0) {
+            num_dates_in_all_lists++;
+        }
+    }
+    std::cout << num_dates_in_all_lists;
+
+    return 0;
+}
diff --git a/task_1496.cpp b/task_1496.cpp
new file mode 100644
index 0000000..abef419
--- /dev/null
+++ b/task_1496.cpp
@@ -0,0 +1,25 @@
+#include <iostream>
+#include <map>
+#include <string>
+
+const int MIN_SUBMISSIONS_TO_BE_SPAMMER = 2;
+
+int main() {
+    size_t num_submissions;
+    std::cin >> num_submissions;
+
+    std::map<std::string, int> team_submissions_counter;
+    std::string current_team;
+    for(size_t i = 0; i < num_submissions; i++) {
+        std::cin >> current_team;
+        team_submissions_counter[current_team]++;
+    }
+
+    for(const auto&[team, team_submissions_count]: team_submissions_counter) {
+        if (team_submissions_count >= MIN_SUBMISSIONS_TO_BE_SPAMMER) {
+            std::cout << team << std::endl;
+        }
+    }
+
+    return 0;
+}
diff --git a/task_1545.cpp b/task_1545.cpp
new file mode 100644
index 0000000..c1e3dce
--- /dev/null
+++ b/task_1545.cpp
@@ -0,0 +1,27 @@
+#include <iostream>
+#include <map>
+#include <set>
+
+int main() {
+    size_t num_hieroglyphs;
+    std::cin >> num_hieroglyphs;
+    std::cin.ignore(1, '\n'); // go to next line to read chars
+
+    std::map<char, std::set<char>> suggestions;
+    char current_letter1, current_letter2;
+    for(size_t i = 0; i < num_hieroglyphs; i++) {
+        std::cin >> current_letter1 >> current_letter2;
+        std::cin.ignore(1, '\n'); // go to next line
+        suggestions[current_letter1].insert(current_letter2);
+    }
+
+    char given_letter;
+    std::cin >> given_letter;
+    if(suggestions.count(given_letter) > 0) {
+        for (const auto& suggested_letter:suggestions.at(given_letter)) {
+            std::cout << given_letter << suggested_letter << std::endl;
+        }
+    } // else print nothing
+
+    return 0;
+}
diff --git a/task_1837.cpp b/task_1837.cpp
new file mode 100644
index 0000000..7a7f697
--- /dev/null
+++ b/task_1837.cpp
@@ -0,0 +1,81 @@
+#include <iostream>
+#include <map>
+#include <set>
+#include <string>
+#include <algorithm>
+#include <queue>
+#include <array>
+
+static const std::string MAIN_MEMBER = "Isenbaev";
+
+using TeamType = std::array<std::string, 3>;
+using IsenbaevsNumbersType = std::map<std::string, int>;
+
+std::istream& operator>>(std::istream& stream, TeamType& team) {
+    stream >> team[0] >> team[1] >> team[2];
+    return stream;
+}
+
+std::ostream& operator<<(std::ostream& stream, const IsenbaevsNumbersType& isenbaevs_numbers) {
+    for (const auto&[member, number]: isenbaevs_numbers) {
+        stream << member << " ";
+        if (number < 0) {
+            stream << "undefined";
+        } else {
+            stream << number;
+        }
+        stream << std::endl;
+    }
+    return stream;
+}
+
+template<typename Key>
+std::map<Key, int> compute_distance(const std::map<Key, std::set<Key>>& graph, const Key& root) {
+    // Breadth-first search
+    std::map<Key, int> distances;
+    std::queue<Key> elements_to_update_neighbours;
+    for (const auto&[element, _]: graph) {
+        distances[element] = -1;
+    }
+    if (graph.count(root) > 0) { // if Isenbaev was in teams
+        distances[MAIN_MEMBER] = 0;
+        elements_to_update_neighbours.push(MAIN_MEMBER);
+    }
+    while (!elements_to_update_neighbours.empty()) {
+        std::string current_element = elements_to_update_neighbours.front();
+        elements_to_update_neighbours.pop();
+        if (graph.count(current_element) > 0) {
+            for (const auto& teammate: graph.at(current_element)) {
+                if (distances[teammate] < 0) {
+                    distances[teammate] = distances[current_element] + 1;
+                    elements_to_update_neighbours.push(teammate);
+                }
+            }
+        }
+    }
+    return distances;
+}
+
+int main() {
+    size_t num_teams;
+    std::cin >> num_teams;
+    std::string name1, name2, name3;
+
+    std::map<std::string, std::set<std::string>> teammates;
+    TeamType team;
+    for (size_t i = 0; i < num_teams; i++) {
+        std::cin >> team;
+        for (const auto& member: team) {
+            for (const auto& member2: team) {
+                if (member != member2) {
+                    teammates[member].insert(member2);
+                }
+            }
+        }
+    }
+
+    IsenbaevsNumbersType isenbaevs_numbers = compute_distance(teammates, MAIN_MEMBER);
+    std::cout << isenbaevs_numbers;
+
+    return 0;
+}