Cacher is the code snippet organizer for pro developers

sort(conections.begin(),conections.end(),
[](const vector<int> &a, const vector<int> &b) { return a[2] < b[2]; } );
//比较二维数组的第二列

// Ascending order
sort(v.begin(), v.end());
sort(v.begin(), v.end(), less<int>());

// Descending order
sort(v.rbegin(), v.rend());
sort(v.begin(), v.end(), greater<int>());