A 56-year-old male with a history of hypertension for over 10 years presents to the emergency room with sudden-onset headache and hemiplegia after defecation lasting 4 hours, accompanied by vomiting twice. Physical examination: BP 26/14 kPa (195/105 mmHg), left upper and lower limb muscle strength grade 0/5, hypotonia, and left-sided hemihypesthesia. Which of the following is the most likely diagnosis?