Compilare: main.cpp: In member function 'BigInt BigInt::operator+(BigInt)': main.cpp:51:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0 ; i < aux.digits.size() && i < digits.size() ; ++ i) { ~~^~~~~~~~~~~~~~~~~~~ main.cpp:51:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0 ; i < aux.digits.size() && i < digits.size() ; ++ i) { ~~^~~~~~~~~~~~~~~ main.cpp:55:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = (int)aux.digits.size() ; i < digits.size() ; ++ i) { ~~^~~~~~~~~~~~~~~ main.cpp:59:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = (int)digits.size() ; i < aux.digits.size() ; ++ i) { ~~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main(int, const char**)': main.cpp:109:23: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &n) ; ^ main.cpp:111:27: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", v + i) ; ^