Problem E: 输出数列1, -1, 1, -1, 1, -1...

Problem E: 输出数列1, -1, 1, -1, 1, -1...

Time Limit: 1 Sec  Memory Limit: 128 MB
Submit: 1726  Solved: 1263
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Description

输入正整数N（N≤100），输出数列(-1)i+1中的前N项。每个数占4个位置 

Sample Input Copy 

5

Sample Output Copy 

   1  -1   1  -1   1
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