[알고리즘] 백준 1764 : 듣보잡 - S4

2023.05.22 풀이

import sys
input=sys.stdin.readline

n,m=map(int, input().split())
arr=set()
arr2=set()

for _ in range(n):
    arr.add(input().rstrip())

for _ in range(m):
    arr2.add(input().rstrip())

res=sorted(list(arr & arr2))

print(len(res))
for i in res:
    print(i)

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다른 풀이

1

import sys
input = sys.stdin.readline

N, M = map(int, input().split())

n = {input().strip() for _ in range(N)}
m = {input().strip() for _ in range(M)}

nm = sorted(n&m)
print(len(nm), *nm, sep='\n')

2

import sys

input = sys.stdin.readline

n, m = map(int, input().split())

arr1 = dict()
answer = []
for i in range(n):
    x = input()
    if x not in arr1:
        arr1[x] = i

for i in range(m):
    y = input()
    if y in arr1:
        answer.append(y)
        
answer.sort()
print(len(answer))
print(''.join(answer), end = '')

---

check point

• set
  선언 : arr=set()
  값 추가 : arr.add
  값 삭제 : arr.remove
  교집합 : a & b
  합집합 : a | b
  차집합 : a - b