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Problem C: 求 n 累加和(ja)
Problem C: 求 n 累加和(ja)
Time Limit:
1
Sec
Memory Limit:
128 MB
Submit:
331
Solved:
46
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Description
用高精度方法,求 s=1+2+3+……+n 的精确值( n的位数 ≤ 200 位)。
Sample Input
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10
Sample Output
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55