Compilare: main.cpp: In function 'int main()': main.cpp:186:36: warning: format '%d' expects argument of type 'int', but argument 3 has type '__gnu_cxx::__alloc_traits<std::allocator<long long int> >::value_type {aka long long int}' [-Wformat=] fprintf(fout,"%d\n" ,sol[i]); ^ main.cpp: In function 'char nextch()': main.cpp:15:34: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buf, 1, MAXBUF, fi); ^