Compilare: user.cpp: In function ‘bool smooth()’: user.cpp:19:10: warning: array subscript has type ‘char’ [-Wchar-subscripts] f1[ch]++; ^ user.cpp:20:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] myMax = max(f1[ch], myMax); ^ user.cpp:23:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (exist[a]) { ^ user.cpp:24:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] myMin = min(myMin, f1[a]); ^ user.cpp: In function ‘int main()’: user.cpp:38:9: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[ch]++; ^ user.cpp:39:13: warning: array subscript has type ‘char’ [-Wchar-subscripts] exist[ch] = true; ^ user.cpp:44:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.size(); i++) { ^ user.cpp:46:14: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[first]--; ^ user.cpp:47:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (f[first] == 0) ^ user.cpp:48:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] exist[first] = false; ^ user.cpp:57:14: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[first]++; ^ user.cpp:33:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("smooth2.in", "r", stdin); ^ user.cpp:34:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("smooth2.out", "w", stdout); ^