Compilare: user.cpp:9:6: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type] main() ^ user.cpp: In function ‘int main()’: user.cpp:14:47: warning: unused variable ‘k’ [-Wunused-variable] int N,cont1[25]={0},cont2[25]={0},i,j,k,test; ^ user.cpp:18:9: warning: ‘N’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(i=0; i<N; i++) ^