Compilare: user.cpp: In function ‘int tmin(int)’: user.cpp:34:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<l[x].size();i++) { ^ user.cpp:37:21: warning: unused variable ‘nr’ [-Wunused-variable] int nr=y-l[x][i].c2; ^ user.cpp:35:17: warning: unused variable ‘nr’ [-Wunused-variable] int nr=l[x][i].c2; ^