Compilare: user.cpp: In function ‘int main()’: user.cpp:12:47: warning: array subscript has type ‘char’ [-Wchar-subscripts] for (int i = 1;s[i];++i) ++a[s[i]-='0'],++b[s[i]]; ^ user.cpp:12:57: warning: array subscript has type ‘char’ [-Wchar-subscripts] for (int i = 1;s[i];++i) ++a[s[i]-='0'],++b[s[i]]; ^ user.cpp:22:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] --a[s[cnt]]; ^ user.cpp:26:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("numar3.out","w",stdout); ^ user.cpp:29:5: warning: ‘bst’ may be used uninitialized in this function [-Wmaybe-uninitialized] for (int i = 1;i < bst;++i) ^