Compilare: user.cpp: In function ‘int main()’: user.cpp:67:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (crt1 != L[1].size() && crt2 != L[2].size()) { ^ user.cpp:67:54: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (crt1 != L[1].size() && crt2 != L[2].size()) { ^ user.cpp:91:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] }else if(crt1 != L[1].size()) { ^