LV1 덧칠하가

def solution(n, m, section):
    answer = 0
    walls = [0 for _ in range(1, n + 1)]
    
    for i in section:
        walls[i - 1] = 1
    
    i = 0
    while i < n:
        if walls[i] == 1:
            answer += 1
            i = i + m -1
        i += 1
        
    return answer

성공