Compilare: user.cpp: In function ‘int main()’: user.cpp:18:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(!frecv[day[i]]) ^ user.cpp:28:40: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(--frecv[day[j++]] == 0) ^ user.cpp:36:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] frecv[day[i]]++; ^ user.cpp:11:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("teatru.in", "r", stdin); ^ user.cpp:12:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("teatru.out", "w", stdout); ^