[Fix revert] Хасаньянов Кирилл. Задача 3. Вариант 2. Умножение плотны… #8333

Job	Run time
macos-clang-build	12m 45s
ubuntu-clang-build	2h 14m 21s
ubuntu-gcc-build	1h 43m 42s
ubuntu-clang-sanitizer-build	11m 33s
windows-msvc-build	1h 18m 10s
ubuntu-gcc-build-codecov	1h 13m 41s
windows-clang-build	30m 46s
	7h 24m 58s

Provide feedback