Problem L: 求1~n的平方和

Problem L: 求1~n的平方和

Time Limit: 1 Sec  Memory Limit: 128 MB
Submit: 1126  Solved: 809
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Description

求 sum=12+22+32+……+n2 之和，输入为不超过100的正整数

Sample Input 

3

Sample Output 

14
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