Compilare: user.cpp: In function ‘int sortInterval(int, int, int, std::pair<int, int>*, int*, std::vector<std::pair<int, int> >&)’: user.cpp:22:27: warning: unused variable ‘swaps’ [-Wunused-variable] int i, lastCandidate, swaps = 0; ^ user.cpp:30:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:63:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < sol.size(); i++) ^ user.cpp:34:15: warning: unused variable ‘counter’ [-Wunused-variable] int n, i, counter[4][4]; ^