Compilare: user.cpp: In function ‘std::vector<int> Transform(std::vector<int>)’: user.cpp:14:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<s.size()) ^ user.cpp:17:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j<s.size()&&s[j]==s[i]) ^ user.cpp: In function ‘std::vector<std::vector<int> > Split(std::vector<int>)’: user.cpp:34:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<s.size()){ ^ user.cpp:36:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<s.size()&&s[i]!=3){ ^ user.cpp: In function ‘void Precompute()’: user.cpp:54:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<result.size();j++) ^ user.cpp:60:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strings.size();i++){ ^ user.cpp:62:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<result.size();j++){ ^ user.cpp: In function ‘int main()’: user.cpp:81:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sir2.in","r",stdin); ^ user.cpp:82:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sir2.out","w",stdout); ^ user.cpp:85:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld",&n); ^