Compilare: main.cpp: In function 'int main()': main.cpp:15:9: warning: unused variable 'x' [-Wunused-variable] int x; ^ main.cpp:28:19: warning: 'ef' may be used uninitialized in this function [-Wmaybe-uninitialized] int smin, ei, ef; ^~ main.cpp:28:15: warning: 'ei' may be used uninitialized in this function [-Wmaybe-uninitialized] int smin, ei, ef; ^~