#29814: python 簡單的解答
b558. 求數列第 n 項
| From: [118.170.61.114] |
發表日期
:
2022-04-03 11:17
b=[1]
for a in range(499):
b.append(b[a]+a+1)
while True:
try:
c=int(input())
print(b[c-1])
except EOFError:
break
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