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- std::vector<std::pair<int, std::vector<int>>> a;
- // ...
- // Bad
- if (!a.back().second.empty()) {
- a.back().second.pop_back();
- }
- // Better, C++98
- std::vector<int>& last = a.back().second;
- if (!last.empty()) {
- last.pop_back();
- }
- // Better, C++11
- auto& last = a.back().second;
- if (!last.empty()) {
- last.pop_back();
- }
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