Compilare: user.cpp: In function ‘void Solve()’: user.cpp:125:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (pmin.size() == N && pmax.size() == N) { ^ user.cpp:125:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (pmin.size() == N && pmax.size() == N) { ^ user.cpp:129:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if (pmin.size() == N) { ^ user.cpp:133:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if (pmax.size() == N) { ^ user.cpp: In function ‘int main()’: user.cpp:156:6: warning: unused variable ‘i’ [-Wunused-variable] int i, t; ^ user.cpp:147:50: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen((fileInput + ".in").c_str(), "r", stdin); ^ user.cpp:148:52: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen((fileInput + ".out").c_str(), "w", stdout); ^