Compilare: main.cpp: In function 'int main()': main.cpp:11:24: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%lld",&n); ^ main.cpp:26:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%lld",&x); ^ main.cpp:14:16: warning: iteration 99999 invokes undefined behavior [-Waggressive-loop-optimizations] phi[i] = i-1; ~~~~~~~^~~~~ main.cpp:13:14: note: within this loop for(i=2;i<=nmax;i++) { ^