Eroare de compilare: main.cpp: In function 'unsigned int two_sum(It, It, int)': main.cpp:9:5: error: 'unordered_map' is not a member of 'std' std::unordered_map<int, unsigned> complement_freq; ^~~ main.cpp:9:24: error: expected primary-expression before 'int' std::unordered_map<int, unsigned> complement_freq; ^~~ main.cpp:14:18: error: 'complement_freq' was not declared in this scope count += complement_freq[*beg]; ^~~~~~~~~~~~~~~ Non zero exit status: 1