0_0_6737645_25810.cpp: In function `bool check_failed(int)':
0_0_6737645_25810.cpp:25: error: 'struct std::_Rb_tree_iterator<std::pair<const int, node> >' has no member named 'second'
0_0_6737645_25810.cpp: In function `void set_failed(int)':
0_0_6737645_25810.cpp:34: error: missing template arguments before '[' token
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