题解 | 小乐乐求和
小乐乐求和
https://www.nowcoder.com/practice/ce0b2eacd3d04647831358c2876e44ff
print((lambda x:x*(x+1)//2)(int(input())))
小乐乐求和
https://www.nowcoder.com/practice/ce0b2eacd3d04647831358c2876e44ff
print((lambda x:x*(x+1)//2)(int(input())))
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