Compilare: user.cpp: In function ‘int main()’: user.cpp:14:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] nr[s[i]]++; ^ user.cpp:18:51: warning: array subscript has type ‘char’ [-Wchar-subscripts] while ((sf>=1)&&((st[sf]>s[i]) && (nr[s[i]]>1) && (nr[st[sf]]>1))){ ^ user.cpp:18:69: warning: array subscript has type ‘char’ [-Wchar-subscripts] while ((sf>=1)&&((st[sf]>s[i]) && (nr[s[i]]>1) && (nr[st[sf]]>1))){ ^ user.cpp:20:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] nr[st[sf]]--; ^ user.cpp:27:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (nr[st[i]]>1) ^ user.cpp:29:21: 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] gets(s); gets(s); ^ /tmp/ccCHHXqj.o: In function `main': user.cpp:(.text.startup+0x6a): warning: the `gets' function is dangerous and should not be used.