Compilare: user.cpp: In function ‘int main()’: user.cpp:8:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("concurs2.in","r",stdin); ^ user.cpp:9:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("concurs2.out","w",stdout); ^ user.cpp:10:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:13:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &j , &id); ^ user.cpp:52:95: warning: ‘jud_second_maximum’ may be used uninitialized in this function [-Wmaybe-uninitialized] printf("%d %d\n",jud_second_maximum,v[jud_second_maximum][v[jud_second_maximum][0]--]); ~~~~~~~~~~~~~~~~~~~~~~~^ user.cpp:47:9: warning: ‘jud_first_maximum’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(jud_first_maximum != ant){ ^~