Compilare: user.cpp: In function ‘bool exista(int)’: user.cpp:12:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<has[key].size();++i) ^ user.cpp: In function ‘void back(int)’: user.cpp:19:10: warning: ‘nr1’ may be used uninitialized in this function [-Wmaybe-uninitialized] has[x%MOD].push_back(x); ^ user.cpp:51:9: note: ‘nr1’ was declared here int nr1; ^ user.cpp:19:10: warning: ‘nr1’ may be used uninitialized in this function [-Wmaybe-uninitialized] has[x%MOD].push_back(x); ^ user.cpp:51:9: note: ‘nr1’ was declared here int nr1; ^ user.cpp:19:10: warning: ‘nr1’ may be used uninitialized in this function [-Wmaybe-uninitialized] has[x%MOD].push_back(x); ^ user.cpp:51:9: note: ‘nr1’ was declared here int nr1; ^ user.cpp:19:10: warning: ‘nr1’ may be used uninitialized in this function [-Wmaybe-uninitialized] has[x%MOD].push_back(x); ^ user.cpp:51:9: note: ‘nr1’ was declared here int nr1; ^ user.cpp:19:10: warning: ‘nr1’ may be used uninitialized in this function [-Wmaybe-uninitialized] has[x%MOD].push_back(x); ^ user.cpp:51:9: note: ‘nr1’ was declared here int nr1; ^ user.cpp:19:10: warning: ‘nr1’ may be used uninitialized in this function [-Wmaybe-uninitialized] has[x%MOD].push_back(x); ^ user.cpp:51:9: note: ‘nr1’ was declared here int nr1; ^ user.cpp:19:10: warning: ‘nr1’ may be used uninitialized in this function [-Wmaybe-uninitialized] has[x%MOD].push_back(x); ^ user.cpp:51:9: note: ‘nr1’ was declared here int nr1; ^ user.cpp:19:10: warning: ‘nr1’ may be used uninitialized in this function [-Wmaybe-uninitialized] has[x%MOD].push_back(x); ^