goorm 재원 넘버, 부모 단어, 피자 쿠폰

재원 넘버

# -*- coding: utf-8 -*-
# UTF-8 encoding when using korean
n = int(input())
cnt = 0
for i in range(1, n+1):
	cnt += 3 ** i
print(cnt)

 

부모 단어

# -*- coding: utf-8 -*-
# UTF-8 encoding when using korean
n,m = input().split(' ')
parent = [i for i in n]
qst = [j for j in m]
sw = 0
for k in range(len(qst)):
	if qst[k] not in parent:
		sw = 1
if(sw==0):
	print("YES")
else:
	print("NO")

 

피자 쿠폰

#include <iostream>
using namespace std;
int main() {
	int n, m;
	cin >> n >> m;
	int piz = n;
	piz += n / m;
	piz += ((n / m) + (n % m)) / m;
	cout << piz;
	return 0;
}