Compilare: user.cpp: In function ‘int EuclideanAlgorithm(int, int)’: user.cpp:15:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘long long int ModularLinearEquation(long long int, long long int, long long int)’: user.cpp:64:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:72:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%lld %lld", &A, &N); ^