1
#include <set>
2
/*---*/
3
multiset<typename _Kty, typename _Pr = less<_Kty >,typename _Alloc = allocator <_Kty > >

1
for (auto it = multiset.begin(); it != multiset.end(); ++it)
2
  *it

1
for(auto it : multiset)
2
  it

1
*next(multiset.begin(), i);

1
vector<int> a;
2
/*input*/
3
sort(a.begin(), a.end());
4
auto lbn = lower_bound(a.begin(), a.end(), n);

1
multiset<int> a;
2
/*input*/
3
auto lbn = a.lower_bound(5);

1
#include<tuple>
2
/*---*/
3
tuple<typename ..._Types>

1
priority_queue < tuple<int, string, vector<int, int> > >

1
get<i> tuple
2
//i指下标（tuple的第i项），tuple指定义了tuple类型的名字

1
iota(vector.begin(), vector.end(), 0);