add length analyzer

CMakeLists.txt

@@ -58,6 +58,7 @@ include_directories(password-analyzer PRIVATE ${CMAKE_BINARY_DIR}/external)
 set(COMMON_SOURCES
         defs.hpp
         utils.cpp
+        stat_length.cpp
 )
 set(COMMON_LIBRARIES
         magic_enum::magic_enum

defs.hpp

@@ -21,4 +21,5 @@ bool is_alpha(char c);
 
 std::generator<std::string> passwords(const DataSource &source);
 
+void stat_length(const DataSource &source);
 #endif // DEFS_HPP

stat_length.cpp

@@ -0,0 +1,16 @@
+#include <algorithm>
+#include <map>
+#include <vector>
+#include "defs.hpp"
+
+void stat_length(const DataSource &source) {
+    spdlog::info("stat_length({})", magic_enum::enum_name(source));
+
+    std::map<size_t, size_t> stat;
+    for (auto const &password : passwords(source)) ++stat[password.size()];
+
+    std::vector<std::pair<size_t, size_t>> vec(stat.begin(), stat.end());
+    std::sort(vec.begin(), vec.end(), [](auto const &lhs, auto const &rhs) { return lhs.second > rhs.second; });
+
+    for (auto const &[length, count] : vec | std::views::take(10)) spdlog::info("{}: {}", length, count);
+}