Compilare: user.cpp: In function ‘void Elimin(int)’: user.cpp:40:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < st.size(); i++) { ^ user.cpp: In function ‘bool Solution(int64_t)’: user.cpp:70:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < st.size(); ++j) ^ user.cpp:72:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int t = 0; t < st.size(); ++t) { ^