Problem1311--求数列的前n项和1311: 求数列的前n项和
Time Limit: 1 Sec Memory Limit: 128 MB
Submit: 279 Solved: 200
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求数列的前
n项和
函数功能是：计算数列的每一项，
n由键盘输入。累加过程和输入输出均在主函数中完成
Input
3
Output
123
Sample Input
3
Sample Output
123
Source/Category
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