51         assert(m.begin()->first == 1);  in main()
53         assert(std::next(m.begin())->first == 2);  in main()
55         assert(std::next(m.begin(), 2)->first == 3);  in main()
57         assert(std::next(m.begin(), 3)->first == 5);  in main()
59         assert(std::next(m.begin(), 4)->first == 6);  in main()
61         assert(std::next(m.begin(), 5)->first == 7);  in main()
63         assert(std::next(m.begin(), 6)->first == 8);  in main()
69         assert(m.begin()->first == 2);  in main()
71         assert(std::next(m.begin())->first == 3);  in main()
73         assert(std::next(m.begin(), 2)->first == 5);  in main()
75         assert(std::next(m.begin(), 3)->first == 6);  in main()
77         assert(std::next(m.begin(), 4)->first == 7);  in main()
79         assert(std::next(m.begin(), 5)->first == 8);  in main()
85         assert(m.begin()->first == 2);  in main()
87         assert(std::next(m.begin())->first == 3);  in main()
89         assert(std::next(m.begin(), 2)->first == 5);  in main()
91         assert(std::next(m.begin(), 3)->first == 6);  in main()
93         assert(std::next(m.begin(), 4)->first == 7);  in main()
99         assert(m.begin()->first == 2);  in main()
101         assert(std::next(m.begin())->first == 5);  in main()
103         assert(std::next(m.begin(), 2)->first == 6);  in main()
105         assert(std::next(m.begin(), 3)->first == 7);  in main()
111         assert(m.begin()->first == 2);  in main()
113         assert(std::next(m.begin())->first == 5);  in main()
115         assert(std::next(m.begin(), 2)->first == 7);  in main()
121         assert(m.begin()->first == 2);  in main()
123         assert(std::next(m.begin())->first == 5);  in main()
129         assert(m.begin()->first == 5);  in main()
158         assert(m.begin()->first == 1);  in main()
160         assert(std::next(m.begin())->first == 2);  in main()
162         assert(std::next(m.begin(), 2)->first == 3);  in main()
164         assert(std::next(m.begin(), 3)->first == 5);  in main()
166         assert(std::next(m.begin(), 4)->first == 6);  in main()
168         assert(std::next(m.begin(), 5)->first == 7);  in main()
170         assert(std::next(m.begin(), 6)->first == 8);  in main()
176         assert(m.begin()->first == 2);  in main()
178         assert(std::next(m.begin())->first == 3);  in main()
180         assert(std::next(m.begin(), 2)->first == 5);  in main()
182         assert(std::next(m.begin(), 3)->first == 6);  in main()
184         assert(std::next(m.begin(), 4)->first == 7);  in main()
186         assert(std::next(m.begin(), 5)->first == 8);  in main()
192         assert(m.begin()->first == 2);  in main()
194         assert(std::next(m.begin())->first == 3);  in main()
196         assert(std::next(m.begin(), 2)->first == 5);  in main()
198         assert(std::next(m.begin(), 3)->first == 6);  in main()
200         assert(std::next(m.begin(), 4)->first == 7);  in main()
206         assert(m.begin()->first == 2);  in main()
208         assert(std::next(m.begin())->first == 5);  in main()
210         assert(std::next(m.begin(), 2)->first == 6);  in main()
212         assert(std::next(m.begin(), 3)->first == 7);  in main()
218         assert(m.begin()->first == 2);  in main()
220         assert(std::next(m.begin())->first == 5);  in main()
222         assert(std::next(m.begin(), 2)->first == 7);  in main()
228         assert(m.begin()->first == 2);  in main()
230         assert(std::next(m.begin())->first == 5);  in main()
236         assert(m.begin()->first == 5);  in main()