Compilare: main.cpp: In function 'bool ok(int)': main.cpp:19:12: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if ((mask & i) == i && fr[i]) ^ main.cpp: In function 'int main()': main.cpp:57:46: warning: format '%u' expects argument of type 'unsigned int', but argument 4 has type 'std::vector<int>::size_type {aka long unsigned int}' [-Wformat=] fprintf(fout, "%d %u\n", mask, ans.size()); ^ main.cpp:31:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &n, &s); ^ main.cpp:35:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &x); ^