Compilare: user.cpp: In function ‘int main()’: user.cpp:22:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0 ; i < strlen(s) ; ++i ){ ^ user.cpp:24:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] ++fr[s[i]]; ^ user.cpp:25:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] if( fr[s[i]] > fr[frMax] ) frMax = s[i]; ^ user.cpp:25:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] if( fr[s[i]] > fr[frMax] ) frMax = s[i]; ^ user.cpp:26:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] if( fr[s[i]] < fr[frMin] ) frMin = s[i]; ^ user.cpp:26:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] if( fr[s[i]] < fr[frMin] ) frMin = s[i]; ^ user.cpp:28:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] if( fr[frMax] - fr[frMin] > 1 ){ ^ user.cpp:28:33: warning: array subscript has type ‘char’ [-Wchar-subscripts] if( fr[frMax] - fr[frMin] > 1 ){ ^ user.cpp:29:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] --fr[s[i]]; ^ user.cpp:30:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] ++fr[frMin]; ^