Hell build log

/home/eezotop/cpp_projects/cf-contest/src/return.cpp:27:5: warning: multiple declarations in a single statement reduces readability [readability-isolate-declaration]
    ll a, b, ab, ba;
    ^~~~~~~~~~~~~~~~
/home/eezotop/cpp_projects/cf-contest/src/return.cpp:27:8: warning: variable 'a' is not initialized [cppcoreguidelines-init-variables]
    ll a, b, ab, ba;
       ^
         = 0
/home/eezotop/cpp_projects/cf-contest/src/return.cpp:27:11: warning: variable 'b' is not initialized [cppcoreguidelines-init-variables]
    ll a, b, ab, ba;
          ^
            = 0
/home/eezotop/cpp_projects/cf-contest/src/return.cpp:27:14: warning: variable 'ab' is not initialized [cppcoreguidelines-init-variables]
    ll a, b, ab, ba;
             ^
                = 0
/home/eezotop/cpp_projects/cf-contest/src/return.cpp:27:18: warning: variable 'ba' is not initialized [cppcoreguidelines-init-variables]
    ll a, b, ab, ba;
                 ^
                    = 0
/home/eezotop/cpp_projects/cf-contest/src/return.cpp:37:9: warning: do not implicitly decay an array into a pointer; consider using gsl::array_view or an explicit cast instead [cppcoreguidelines-pro-bounds-array-to-pointer-decay]
        assert(curr_count == in.size());
        ^
/usr/include/assert.h:95:51: note: expanded from macro 'assert'
      : __assert_fail (#expr, __FILE__, __LINE__, __ASSERT_FUNCTION))
                                                  ^
/usr/include/assert.h:129:30: note: expanded from macro '__ASSERT_FUNCTION'
#   define __ASSERT_FUNCTION    __extension__ __PRETTY_FUNCTION__
                                ^
/home/eezotop/cpp_projects/cf-contest/src/return.cpp:49:15: warning: do not use 'else' after 'break' [readability-else-after-return]
            } else if (in[idx + 1] != curr_ch) {
              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[3/5] Linking CXX static library libmy-library.a
[4/5] Building CXX object CMakeFiles/my-exec.dir/src/main.cpp.o
/home/eezotop/cpp_projects/cf-contest/src/main.cpp:14:31: warning: converting integer literal to bool, use bool literal instead [modernize-use-bool-literals]
    ios_base::sync_with_stdio(0);
                              ^
note: this fix will not be applied because it overlaps with another fix
/home/eezotop/cpp_projects/cf-contest/src/main.cpp:14:31: warning: implicit conversion 'int' -> bool [readability-implicit-bool-conversion]
note: this fix will not be applied because it overlaps with another fix
/home/eezotop/cpp_projects/cf-contest/src/main.cpp:15:13: warning: use nullptr [modernize-use-nullptr]
    cin.tie(0);
            ^
            nullptr
/home/eezotop/cpp_projects/cf-contest/src/main.cpp:16:14: warning: use nullptr [modernize-use-nullptr]
    cout.tie(0);
             ^
             nullptr
/home/eezotop/cpp_projects/cf-contest/src/main.cpp:19:19: warning: variable 'k' is not initialized [cppcoreguidelines-init-variables]
    long long int k; cin >> k;
                  ^
                    = 0
/home/eezotop/cpp_projects/cf-contest/src/main.cpp:27:19: warning: variable 'alpha' is not initialized [cppcoreguidelines-init-variables]
    long long int alpha; cin >> alpha;
                  ^
                        = 0
/home/eezotop/cpp_projects/cf-contest/src/main.cpp:29:19: warning: variable 'n' is not initialized [cppcoreguidelines-init-variables]
    long long int n; cin >> n;
                  ^
                    = 0
/home/eezotop/cpp_projects/cf-contest/src/main.cpp:37:23: warning: variable 'c' is not initialized [cppcoreguidelines-init-variables]
        long long int c; cin >> c; c--;
                      ^
                        = 0
/home/eezotop/cpp_projects/cf-contest/src/main.cpp:38:23: warning: variable 'l' is not initialized [cppcoreguidelines-init-variables]
        long long int l; cin >> l;
                      ^
                        = 0
/home/eezotop/cpp_projects/cf-contest/src/main.cpp:54:26: warning: 20 is a magic number; consider replacing it with a named constant [cppcoreguidelines-avoid-magic-numbers]
    cout << setprecision(20);
                         ^
/home/eezotop/cpp_projects/cf-contest/src/main.cpp:54:26: warning: 20 is a magic number; consider replacing it with a named constant [readability-magic-numbers]
/home/eezotop/cpp_projects/cf-contest/src/main.cpp:56:19: warning: variable 'm' is not initialized [cppcoreguidelines-init-variables]
    long long int m; cin >> m;
                  ^
                    = 0
/home/eezotop/cpp_projects/cf-contest/src/main.cpp:59:23: warning: variable 'l' is not initialized [cppcoreguidelines-init-variables]
        long long int l; cin >> l;
                      ^
                        = 0
/home/eezotop/cpp_projects/cf-contest/src/main.cpp:78:32: warning: implicit conversion 'std::unordered_set<std::__cxx11::basic_string<char>, std::hash<std::string>, std::equal_to<std::__cxx11::basic_string<char> >, std::allocator<std::__cxx11::basic_string<char> > >::size_type' (aka 'unsigned long') -> bool [readability-implicit-bool-conversion]
                sum_log += log(in_test.count(word) ? div : EDINITSA - div);
                               ^
                                                   != 0u
/home/eezotop/cpp_projects/cf-contest/src/main.cpp:86:9: warning: use range-based for loop instead [modernize-loop-convert]
        for (int mem = 0; mem < classify.size(); mem++)
        ^   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
            (long double & mem : classify)