Compilare: user.cpp: In function ‘int main()’: user.cpp:111:53: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < vecini[div].size(); ++j){ ^ user.cpp:36:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nk.in", "r", stdin); ^ user.cpp:37:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nk.out", "w", stdout); ^