Compilare: user.cpp: In function ‘void citire()’: user.cpp:10:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, x, y; ^ user.cpp: In function ‘int vecini(int, int&)’: user.cpp:24:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[x].size();i++) ^ user.cpp:30:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[w].size();j++) ^ user.cpp: In function ‘void euler(int)’: user.cpp:45:9: warning: unused variable ‘i’ [-Wunused-variable] int i, w; ^