Compilare: user.cpp: In function ‘void Elimin(int)’: user.cpp:50:31: 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:80:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < st.size(); ++j) ^ user.cpp:82:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int t = 0; t < st.size(); ++t) { ^ user.cpp: In function ‘int main()’: user.cpp:115:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("oneouts.in", "r", stdin); ^ user.cpp:116:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("oneouts.out", "w", stdout); ^