Compilare: user.cpp: In function ‘bool exista(int)’: user.cpp:54:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(t > sir[i].size()) ^ user.cpp:60:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = t; j < sir[i].size(); j++) ^ user.cpp: In function ‘bool cautare(int, long long int)’: user.cpp:39:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int caut_bin()’: user.cpp:134:1: warning: control reaches end of non-void function [-Wreturn-type] } ^