Compilare: user.cpp: In function ‘void write()’: user.cpp:55:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < euler.size(); ++ i){ ^ user.cpp: In function ‘int main()’: user.cpp:70:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^ user.cpp:73:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &x, &y); ^