Compilare: user.cpp: In function ‘int maxSlidingWindow(std::vector<int>&, int)’: user.cpp:23:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = k; i <= nums.size(); i++) { ~~^~~~~~~~~~~~~~ user.cpp:25:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i == nums.size()) break; ~~^~~~~~~~~~~~~~ user.cpp:14:6: warning: unused variable ‘difference_max’ [-Wunused-variable] int difference_max = -1; ^~~~~~~~~~~~~~