Compilare: user.cpp: In function ‘int solve_first()’: user.cpp:19:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(ap[ch[j]]!=0) ++bad; ^ user.cpp:20:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] ap[ch[j]]=1; ^ user.cpp:22:49: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(int j=i;j<min(i+per,n);j++) ap[ch[j]]=0; ^ user.cpp: In function ‘int solve_second(char)’: user.cpp:36:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(ap[ch[j]]!=0) ++bad; ^ user.cpp:37:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] ap[ch[j]]=1; ^ user.cpp:39:49: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(int j=i;j<min(n,i+per);j++) ap[ch[j]]=0; ^ user.cpp: In function ‘int main()’: user.cpp:52:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(ap2[ch[i]]==0) dif.pb(ch[i]); ^ user.cpp:53:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] ap2[ch[i]]++; ^ user.cpp:54:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] sol=min(sol,n-ap2[ch[i]]); ^ user.cpp:57:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<dif.size();i++) ^ user.cpp:45:37: 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:46:39: 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); ^ user.cpp:47:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",ch); ^