diff --git a/subtitle.cpp b/subtitle.cpp
new file mode 100644
index 0000000..2d7b4a9
--- /dev/null
+++ b/subtitle.cpp
@@ -0,0 +1,50 @@
+int count_words(std::string string) {
+    // count the number of words in a given string
+    return std::regex_match(string, std::regex("\\w+")).size();
+}
+
+int count_chars(std::string string) {
+    // count the number of characters in a given string
+    return string.length();
+}
+
+int count_lines(std::string file) {
+    // count the number of lines in a given file
+    std::ifstream f(file);
+    std::string line;
+    int num_lines = 0;
+    while (std::getline(f, line)) {
+        num_lines++;
+    }
+    return num_lines;
+}
+
+int count_blank_lines(std::string file) {
+    // count the number of blank lines in a given file
+    std::ifstream f(file);
+    std::string line;
+    int num_blank_lines = 0;
+    while (std::getline(f, line)) {
+        if (line.length() == 0) {
+            num_blank_lines++;
+        }
+    }
+    return num_blank_lines;
+}
+
+std::map<std::string, int> subtitle_quality(std::string file) {
+    // calculate the subtitle quality metrics for a given file
+    int num_lines = count_lines(file);
+    int num_blank_lines = count_blank_lines(file);
+    int num_words = 0;
+    int num_chars = 0;
+    std::ifstream f(file);
+    std::string line;
+    while (std::getline(f, line)) {
+        if (line.length() != 0) {
+            num_words += count_words(line);
+            num_chars += count_chars(line);
+        }
+    }
+    float avg_chars_per_line = (float)num_chars / (num_lines - num_blank_lines);
+    float avg_words_