Compilare: user.cpp: In member function ‘std::size_t std::hash<std::pair<int, int> >::operator()(const std::pair<int, int>&) const’: user.cpp:12:34: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] return int_hasher(v.first)<<16+ int_hasher(v.second); ^ user.cpp: In function ‘int main()’: user.cpp:85:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v.size(); i++) ^ user.cpp:100:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = banane.size()-k; i < banane.size(); i++) ^ user.cpp:84:7: warning: unused variable ‘g’ [-Wunused-variable] bool g=binary_search(v.begin(), v.end(), make_pair(2, 1)); ^