Compilare: user.cpp: In function ‘int main()’: user.cpp:17:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] fr[si[i]]++; ^ user.cpp:33:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] fr[si[x]]++; ^ user.cpp:36:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] fr[si[x]]--; ^ user.cpp:39:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(fr[si[x]]==0 && ta[si[x]]==0) ^ user.cpp:39:48: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(fr[si[x]]==0 && ta[si[x]]==0) ^ user.cpp:10:23: warning: unused variable ‘y’ [-Wunused-variable] int n,i,j,l,m=0,x,y,p; ^ user.cpp:8:40: 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:9:42: 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:11:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n",&n); ^ user.cpp:12:15: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(si+1); ^ /tmp/ccbOHRhl.o: In function `main': user.cpp:(.text.startup+0x6a): warning: the `gets' function is dangerous and should not be used.