// property lookup, so we do that here.
The report pointed out how birth rates in the U.S. have been below the minimum replacement rate since 2008, meaning that the bulk of population growth since then has been the result of immigration. This has proved especially true for the country’s labor force. Nearly 80% of immigrants are of working age, according to the Census, and they account for 19% of the workforce, around 33 million people.
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int i = 0, j = 0, k = left; // i:左数组指针, j:右数组指针, k:原数组指针