https://www.acmicpc.net/problem/9095
import sys
max = 10
sum = [0] * (max+1)
sum[0] = 0
sum[1] = 1
sum[2] = 2
sum[3] = 4
ans=[]
for i in range(4,max+1):
sum[i] += sum[i-1] + sum[i-2] +sum[i-3]
t = int(sys.stdin.readline().strip())
for _ in range(t):
n = int(sys.stdin.readline().strip())
ans.append(sum[n])
for i in ans:
print(i)
import sys
data = int(sys.stdin.readline())
for _ in range(data):
num = []
num.append(1)
num.append(1)
num.append(2)
num.append(4)
n = int(sys.stdin.readline())
for i in range(4, n + 1):
num.append(num[i - 1] + num[i - 2] + num[i - 3])
print(num[n])