Compilare: user.cpp: In function ‘int main()’: user.cpp:17:12: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[v[st]]++; ^ user.cpp:30:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (f[v[i]] == 0) ^ user.cpp:32:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[v[i]]++; ^ user.cpp:35:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (f[v[st]] == 1) ^ user.cpp:37:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[v[st]]--; ^ user.cpp:42:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[v[st]]--; ^ user.cpp:43:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (f[v[st]] == 0) ^ user.cpp:12:10: warning: unused variable ‘ch’ [-Wunused-variable] char ch; ^ user.cpp:9:35: 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:10:37: 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); ^ user.cpp:13:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n",&n,&c); ^