Compilare: user.cpp: In function ‘int main()’: user.cpp:60:62: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(!v.empty() && v.back() != '(' && prior[v.back()] >= prior[s[pos]]) { ^ user.cpp:60:79: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(!v.empty() && v.back() != '(' && prior[v.back()] >= prior[s[pos]]) { ^ user.cpp:30:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("evaluare.in", "r", stdin); ^ user.cpp:31:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("evaluare.out", "w", stdout); ^ user.cpp:36:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", s); ^