Compilare: user.cpp: In function ‘int main()’: user.cpp:24:8: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] {if(!st.empty()) ^ user.cpp:9:10: warning: unused variable ‘j’ [-Wunused-variable] {int n,i,j,cont=0,nr,maxi=0,che=1,t,ok; ^ user.cpp:9:29: warning: unused variable ‘che’ [-Wunused-variable] {int n,i,j,cont=0,nr,maxi=0,che=1,t,ok; ^ user.cpp:9:35: warning: unused variable ‘t’ [-Wunused-variable] {int n,i,j,cont=0,nr,maxi=0,che=1,t,ok; ^ user.cpp:9:37: warning: unused variable ‘ok’ [-Wunused-variable] {int n,i,j,cont=0,nr,maxi=0,che=1,t,ok; ^