Compilare: user.cpp: In function ‘int main()’: user.cpp:53:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] x[v[i]]++; ^ user.cpp:66:59: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘long long int’ [-Wformat=] printf("%d %d\n", d[i], C(i - 1, k - (n - i - 1)) ); ^ user.cpp:56:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d", &k); ^