Compilare: main.cpp: In function 'int main()': main.cpp:22:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(a);i+=2) ~^~~~~~~~~~ main.cpp:40:16: warning: array subscript has type 'char' [-Wchar-subscripts] o[q]=q-'a'+1; ^ main.cpp:45:31: warning: array subscript has type 'char' [-Wchar-subscripts] s=s+max(o[a[i]],o[a[i+2]]); ^ main.cpp:45:41: warning: array subscript has type 'char' [-Wchar-subscripts] s=s+max(o[a[i]],o[a[i+2]]); ^ main.cpp:13:28: warning: unused variable 'nrap' [-Wunused-variable] int i, k=1, maxk=1, p, nrap=0, s=0, x; ^~~~ main.cpp:14:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("charlie.in","r",stdin); ^ main.cpp:15:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("charlie.out","w",stdout); ^