diff --git a/problems/my-calendar-i.cpp b/problems/my-calendar-i.cpp
new file mode 100644
index 0000000..b6a2f65
--- /dev/null
+++ b/problems/my-calendar-i.cpp
@@ -0,0 +1,151 @@
+#include <cassert>
+#include <iostream>
+#include <vector>
+
+namespace {
+
+struct range_t {
+    int start;
+    int end;
+
+    range_t(int start, int end)
+        : start(start)
+        , end(end)
+    {
+    }
+
+    bool has(int x) const { return x > start && x < end; }
+
+    bool operator>(const range_t& other) const { return start > other.start; }
+
+    bool operator==(const range_t& other) const
+    {
+        return start == other.start && end == other.end;
+    }
+};
+
+bool overlaps(const range_t& a, const range_t& b)
+{
+    return a == b || a.has(b.start) || a.has(b.end) || b.has(a.start) || b.has(a.end);
+}
+
+} // namespace
+
+class MyCalendar {
+    std::vector<range_t> entries;
+
+public:
+    MyCalendar() = default;
+
+    bool book(int start, int end)
+    {
+        entries.emplace_back(start, end);
+
+        auto it = entries.end();
+        it--;
+
+        for (int i = entries.size() - 1; i > 0 && entries[i - 1] > entries[i];
+             i--, it--) {
+            if (overlaps(entries[i], entries[i - 1])) {
+                entries.erase(it);
+                return false;
+            }
+
+            std::swap(entries[i], entries[i - 1]);
+        }
+
+        if (it > entries.begin() && overlaps(*it, *(it - 1))) {
+            entries.erase(it);
+            return false;
+        }
+
+        return true;
+    }
+};
+
+/**
+ * Your MyCalendar object will be instantiated and called as such:
+ * MyCalendar* obj = new MyCalendar();
+ * bool param_1 = obj->book(start,end);
+ */
+
+static void test_case_1()
+{
+    std::cout << "=== TEST CASE 1 ===\n";
+
+    std::vector<range_t> entries { { 47, 50 }, { 33, 41 }, { 39, 45 }, { 33, 42 },
+        { 25, 32 }, { 26, 35 }, { 19, 25 }, { 3, 8 },
+        { 8, 13 }, { 18, 27 } };
+    std::vector<bool> expected { true, true, false, false, true,
+        false, true, true, true, false };
+
+    MyCalendar c;
+    for (auto i = 0; i < entries.size(); i++) {
+        std::cout << "[TEST] Entry #" << i << "\n";
+
+        auto [start, end] = entries[i];
+        assert(c.book(start, end) == expected[i]);
+
+        std::cout << "[PASS]\n\n";
+    }
+}
+
+static void test_case_2()
+{
+    std::cout << "=== TEST CASE 2 ===\n";
+
+    std::vector<range_t> entries { { 37, 50 }, { 33, 50 }, { 4, 17 }, { 35, 48 }, { 8, 25 } };
+    std::vector<bool> expected { true, false, true, false, false };
+
+    MyCalendar c;
+    for (auto i = 0; i < entries.size(); i++) {
+        std::cout << "[TEST] Entry #" << i << "\n";
+
+        auto [start, end] = entries[i];
+        assert(c.book(start, end) == expected[i]);
+
+        std::cout << "[PASS]\n\n";
+    }
+}
+
+static void test_case_3()
+{
+    std::cout << "=== TEST CASE 3 ===\n";
+
+    std::vector<range_t> entries {
+        { 20, 29 }, { 13, 22 }, { 44, 50 }, { 1, 7 }, { 2, 10 }, { 14, 20 },
+        { 19, 25 }, { 36, 42 }, { 45, 50 }, { 47, 50 }, { 39, 45 }, { 44, 50 },
+        { 16, 25 }, { 45, 50 }, { 45, 50 }, { 12, 20 }, { 21, 29 }, { 11, 20 },
+        { 12, 17 }, { 34, 40 }, { 10, 18 }, { 38, 44 }, { 23, 32 }, { 38, 44 },
+        { 15, 20 }, { 27, 33 }, { 34, 42 }, { 44, 50 }, { 35, 40 }, { 24, 31 }
+    };
+    std::vector<bool> expected {
+        true, false, true, true, false, true, false, true, false, false,
+        false, false, false, false, false, false, false, false, false, false,
+        false, false, false, false, false, false, false, false, false, false
+    };
+
+    MyCalendar c;
+    for (auto i = 0; i < entries.size(); i++) {
+        std::cout << "[TEST] Entry #" << i << "\n";
+
+        auto [start, end] = entries[i];
+        assert(c.book(start, end) == expected[i]);
+
+        std::cout << "[PASS]\n\n";
+    }
+}
+
+int main()
+{
+    MyCalendar c;
+    assert(c.book(10, 20));
+    assert(!c.book(15, 25));
+    assert(c.book(20, 30));
+
+    test_case_1();
+    test_case_2();
+    test_case_3();
+
+    return 0;
+}