Eroare de compilare: user.cpp: In function ‘double solve(int, int)’: user.cpp:47:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v.size(); i++) ~^~~~~~~~~ user.cpp:48:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=i+1; j<=i+4 && j<v.size(); j++) ~^~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:64:5: error: request for member ‘push_back’ in ‘p’, which is of non-class type ‘pii [100005] {aka std::pair<int, int> [100005]}’ p.push_back(pii (x, y)); ^~~~~~~~~ user.cpp:66:9: error: request for member ‘begin’ in ‘p’, which is of non-class type ‘pii [100005] {aka std::pair<int, int> [100005]}’ sort(p.begin(), p.end(), cmp); ^~~~~ user.cpp:66:20: error: request for member ‘end’ in ‘p’, which is of non-class type ‘pii [100005] {aka std::pair<int, int> [100005]}’ sort(p.begin(), p.end(), cmp); ^~~