Compilare: user.cpp: In function ‘void befeu()’: user.cpp:56:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < Q.size(); ++i) ~~^~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:102:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < Q.size(); ++i) ~~^~~~~~~~~~ user.cpp:108:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < Q.size(); ++i) ~~^~~~~~~~~~ user.cpp:141:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < Q.size(); ++i) ~~^~~~~~~~~~ user.cpp:156:13: warning: ‘cur’ may be used uninitialized in this function [-Wmaybe-uninitialized] cur = cur->de_unde[copie_n]; ~~~~^~~~~~~~~~~~~~~~~~~~~~~