Compilare: user.cpp: In member function ‘void bignum::write()’: user.cpp:238:27: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘ll {aka long long int}’ [-Wformat=] printf("%I64d",data[len]); ^ user.cpp:239:57: warning: unknown conversion type character ‘I’ in format [-Wformat=] for(int i=len-1;i>=1;--i)printf("%0*I64d",Blen,data[i]); ^ user.cpp:239:57: warning: too many arguments for format [-Wformat-extra-args] user.cpp: In function ‘int main()’: user.cpp:247:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("perm.in", "r", stdin); ^ user.cpp:248:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("perm.out", "w", stdout); ^ user.cpp:249:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &k); ^