gcc执行结果(带初值):
time elapsed for allocation finished : 0.04800000(s)
time elapsed for assignment finished : 0.01400000(s)
如果不带初值定义vv, 结果如下
time elapsed for allocation finished : 0.00000000(s)
time elapsed for assignment finished : 0.05200000(s)
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FROM 120.244.224.*