Compilare: main.cpp: In function 'void Phi(int, int)': main.cpp:44:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( j = 0 ; j < prime.size() && prime[j] <= ciur[i] ; j++ ) { ~~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:66:35: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d%d", &n, &mod ) ; ^