Compilare: main.cpp: In function 'int main()': main.cpp:25:9: warning: unused variable 's' [-Wunused-variable] int s=1; ^ main.cpp:27:9: warning: unused variable 'j' [-Wunused-variable] int j; ^ main.cpp:30:9: warning: unused variable 'ok' [-Wunused-variable] int ok=0; ^~ main.cpp:42:20: warning: 'index' may be used uninitialized in this function [-Wmaybe-uninitialized] viz[index] = 1; ~~~~~~~~~~~^~~