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[TOC]
# 并集
```
int a[] = { 1,2,3,4,5,6, 7};
int a1[] = { 1,1,2,3,4,5,6,8,10 };
std::ostream_iterator oiter(std::cout, " ");
std::multiset set1(a, a + 7);
std::multiset set2(a1, a1 + 9);
std
? 模板 ?
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