c++ map insert .second

在C++的map中，insert函数返回一个pair类型的值，其中的second成员表示插入操作是否成功。如果插入成功，则second为true；如果插入失败（即map中已存在该键值对），则second为false。所以，通常我们可以通过检查insert函数的返回值的second来确定插入是否成功。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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