Compilare: user.cpp: In function ‘void CheckNumber(int)’: user.cpp:59:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<List.size();i++) ^ user.cpp: In function ‘void Back(int, int)’: user.cpp:71:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(lvl==S.size()-1) ^ user.cpp: In function ‘void lcm(int)’: user.cpp:86:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Div.size();i++) ^ user.cpp:91:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j==S.size()) ^ user.cpp: In function ‘int main()’: user.cpp:118:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<S.size()/2;i++) ^ user.cpp: In function ‘int GetPeriod(int, int, int)’: user.cpp:22:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int Next(int)’: user.cpp:38:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:106:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("spirala2.in","r",stdin); ^ user.cpp:107:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("spirala2.out","w",stdout); ^ user.cpp:108:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&N,&K); ^