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Problem D: 累加奇偶交替求和
Problem D: 累加奇偶交替求和
[Creator :
]
Time Limit :
1.000
sec
Memory Limit :
128 MiB
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ProblemList
Solved: 11
Submit Num: 11
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Description
输入 n,计算式子:1-2+3-4+5-……±n 的结果
例如:
5
计算:1-2+3-4+5=3
Sample Input
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6
Sample Output
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-3