Compilare: user.cpp: In function ‘void Elimin(int)’: user.cpp:56:31: 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:100:7: warning: variable ‘last’ set but not used [-Wunused-but-set-variable] int last = 2; ^ user.cpp: In function ‘void Solve()’: user.cpp:121:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(st.size() <= K) { ^ user.cpp:123:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < st.size(); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:142:36: 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:143:38: 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); ^