Compilare: main.cpp: In function 'int main()': main.cpp:28:9: warning: unused variable 'i' [-Wunused-variable] int i,j,k,index=0,firstcount=0; ^ main.cpp:28:11: warning: unused variable 'j' [-Wunused-variable] int i,j,k,index=0,firstcount=0; ^ main.cpp:28:13: warning: unused variable 'k' [-Wunused-variable] int i,j,k,index=0,firstcount=0; ^ main.cpp:28:15: warning: unused variable 'index' [-Wunused-variable] int i,j,k,index=0,firstcount=0; ^~~~~