Compilare: user.cpp: In function ‘long long int ct(std::vector<long long int>)’: user.cpp:22:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < o.size(); i++) { ^ user.cpp:34:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < o.size(); i++) ^ user.cpp:18:12: warning: unused variable ‘sp’ [-Wunused-variable] int i, sp = 0, sn = 0; ^ user.cpp:18:20: warning: unused variable ‘sn’ [-Wunused-variable] int i, sp = 0, sn = 0; ^ user.cpp: In function ‘int main()’: user.cpp:44:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < cazuri.size(); i++) { ^