Compilare: user.cpp: In function ‘void Solve()’: user.cpp:129:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= N - nr - 2; ++i) { ^ user.cpp: In function ‘int main()’: user.cpp:153:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("semipal.in", "r", stdin); ^ user.cpp:154:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("semipal.out", "w", stdout); ^