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最简单的做法就是直接用电话号码做索引，一千万的数组，还是可以开的
这样的好处是不用排序了
输出的时候要注意一下，不要直接printf("%d-%d %d\n", i/10000, i%10000, a[i])，因为前端的0会输不出来的。必须一位一位输出
供参考
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