HELPHAND - Dementia

[dj_r_1]

Invitation to Dementia 2020 (Rated for Div. 2) on CodeChef

You are correct. Answer for N = 7 is 7. Initially: [1,2,3,4,5,6,7]. Perform (6,7): [1,2,3,4,5,42,42] Perform (4,5): [1,2,3,20,20, 42,42] Perform (4,6): [1,2,3,420,20,420,42] Perform (5,7): [1,2,3,420,420,420,420] Perform (1,7): [420,2,3,420,420,420,420] Perform (2,7): [420,420,3,420,420,420,420] Perform (3,7): [420,420,420,420,420,420,420]