Compilare: user.cpp: In function ‘int main()’: user.cpp:14:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] nr[s[i]]++; ^ user.cpp:17:13: warning: array subscript has type ‘char’ [-Wchar-subscripts] fol[s[0]]=1; ^ user.cpp:20:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(!fol[s[i]]){ ^ user.cpp:21:57: warning: array subscript has type ‘char’ [-Wchar-subscripts] while ((sf>=1)&&((st[sf]>s[i]) && (nr[st[sf]]>1)) && (!fol[s[i]])){ ^ user.cpp:21:76: warning: array subscript has type ‘char’ [-Wchar-subscripts] while ((sf>=1)&&((st[sf]>s[i]) && (nr[st[sf]]>1)) && (!fol[s[i]])){ ^ user.cpp:22:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] nr[st[sf]]--; ^ user.cpp:23:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] fol[st[sf]]=0; ^ user.cpp:27:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] fol[s[i]]=1; ^ user.cpp:31:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] nr[s[i]]--; ^ user.cpp:19:13: warning: variable ‘g’ set but not used [-Wunused-but-set-variable] int g=0; ^ user.cpp:35:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (nr[st[i]]>1) ^ user.cpp:37:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] nr[st[i]]--; ^ user.cpp:9:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("calandrinon.in","r",stdin); ^ user.cpp:10:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("calandrinon.out","w",stdout); ^ user.cpp:11:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:12:12: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); gets(s); ^ user.cpp:12:24: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result]