Compilare: user.cpp: In function ‘int main()’: user.cpp:48:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<q.size();++i) ^ user.cpp:60:22: warning: converting to non-pointer type ‘int’ from NULL [-Wconversion-null] tmp.c=NULL; ^ user.cpp:67:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<sol.size();++i) ^ user.cpp:37:18: warning: unused variable ‘j’ [-Wunused-variable] int n, m, i, j, p; ^ user.cpp:37:21: warning: unused variable ‘p’ [-Wunused-variable] int n, m, i, j, p; ^