Compilare: user.cpp: In function ‘int main()’: user.cpp:211:39: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘long long int’ [-Wformat=] fprintf(fo,"%d\n", ans); ^ user.cpp: In function ‘char nextch()’: user.cpp:15:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, BUF_SIZE, 1, fi); ^