Compilare: main.cpp: In function 'int main()': main.cpp:31:15: warning: array subscript has type 'char' [-Wchar-subscripts] f[a[i]]--; ^ main.cpp:33:22: warning: array subscript has type 'char' [-Wchar-subscripts] if (need[a[i]]){ ^ main.cpp:35:22: warning: array subscript has type 'char' [-Wchar-subscripts] need[a[i]]--; ^ main.cpp:37:55: warning: array subscript has type 'char' [-Wchar-subscripts] while (elem && a[i] < s[elem] && f[s[elem]] >= need[s[elem]] + 1){ ^ main.cpp:37:72: warning: array subscript has type 'char' [-Wchar-subscripts] while (elem && a[i] < s[elem] && f[s[elem]] >= need[s[elem]] + 1){ ^ main.cpp:38:29: warning: array subscript has type 'char' [-Wchar-subscripts] need[s[elem]]++; ^ main.cpp:11:24: warning: unused variable 'nr' [-Wunused-variable] int n , elem = 0 , nr , i , poz , m; ^~ main.cpp:11:33: warning: unused variable 'poz' [-Wunused-variable] int n , elem = 0 , nr , i , poz , m; ^~~