Compilare: main.cpp: In function 'int main()': main.cpp:18:13: warning: unused variable 'k' [-Wunused-variable] int k; ^ main.cpp:23:13: warning: unused variable 'ok' [-Wunused-variable] int ok = 1; ^~ main.cpp:27:13: warning: unused variable 'sum' [-Wunused-variable] int sum = 0; ^~~ main.cpp:15:9: warning: unused variable 's' [-Wunused-variable] int s[20]; ^