735. Asteroid Collision

link

class Solution:
    def asteroidCollision(self, asteroids: List[int]) -> List[int]:

        
        res = []

        for a in asteroids:
            
            while res and res[-1] > 0 and a < 0:
                if res[-1] + a < 0:
                    res.pop()
                elif res[-1] + a > 0:
                    break
                else:
                    res.pop()
                    break
            else:
                res.append(a)

        return res