C++ sort排序二位数组

C++中的sort函数可以用于对一维数组进行排序，对于二维数组，可以通过自定义sort函数来对二维数组的特定维度进行排序。

对于一个二维数组，如果要对其第二个关键字进行排序，可以使用自定义sort函数，如下所示：

vector<vector<int>> test; // 二维数组test
sort(test.begin(), test.end(), [](const vector<int>& a, const vector<int>& b){
    return a < b<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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