Compilare: main.cpp: In member function 'Huge Huge::operator+(const Huge&) const': main.cpp:62:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < ans.v.size (); i++) { ~~^~~~~~~~~~~~~~~ main.cpp:63:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i < v.size ()) ~~^~~~~~~~~~~ main.cpp:65:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i < other.v.size ()) ~~^~~~~~~~~~~~~~~~~ main.cpp: In member function 'Huge Huge::operator-(const Huge&) const': main.cpp:84:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < ans.v.size (); i++) { ~~^~~~~~~~~~~~~~~ main.cpp:85:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i < v.size ()) ~~^~~~~~~~~~~ main.cpp:87:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i < other.v.size ()) ~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:180:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a.size () - 1; i++) { ~~^~~~~~~~~~~~~~~ main.cpp:162:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("dragonball.in", "r", stdin); ^ main.cpp:163:44: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("dragonball.out", "w", stdout); ^