Compilare: user.cpp: In function ‘int main()’: user.cpp:11:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<s.length();i++) ^ user.cpp:13:14: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(w-a[s[i]]>=3)ans+=s[i],w-=a[s[i]]; ^ user.cpp:13:38: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(w-a[s[i]]>=3)ans+=s[i],w-=a[s[i]]; ^ user.cpp:17:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(;i<s.length();i++) ^ user.cpp:19:14: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(w-a[s[i]]>=0)w-=a[s[i]],ans1+=s[i]; ^ user.cpp:19:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(w-a[s[i]]>=0)w-=a[s[i]],ans1+=s[i]; ^ user.cpp:22:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i==s.length())cout<<ans1<<endl; ^ user.cpp:8:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("texttrim.in","r",stdin); ^ user.cpp:9:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("texttrim.out","w",stdout); ^