Compilare: user.cpp: In function ‘int main()’: user.cpp:16:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] ++v[s[i]];s[i] = j + '0';--v[j]; ^ user.cpp:21:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] ++v[s[i]]; ^ user.cpp:8:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("numar3.in","r",stdin); ^ user.cpp:9:37: 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:10:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n%s\n",&n,s+1); ^