Compilare: user.cpp: In function ‘bool find(int)’: user.cpp:11:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<el.size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:208:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<el.size();j++) el1.push_back(el[j]); ^ user.cpp:223:52: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<el1.size();j++) ^ user.cpp: In function ‘void citeste(int&)’: user.cpp:32:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff,1,dim,stdin); ^ user.cpp:42:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff,1,dim,stdin); ^ user.cpp: In function ‘int main()’: user.cpp:76:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zone.in","r",stdin); ^ user.cpp:77:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zone.out","w",stdout); ^ user.cpp:79:27: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff,1,dim,stdin); ^