Compilare: main.cpp: In function 'int main()': main.cpp:32:15: warning: unused variable 'j' [-Wunused-variable] 32 | int n,d,i,j; | ^ main.cpp: In function 'void precalc_phi()': main.cpp:21:15: warning: iteration 1000004 invokes undefined behavior [-Waggressive-loop-optimizations] 21 | phi[i]=i; | ~~~~~~^~ main.cpp:20:14: note: within this loop 20 | for(i=1;i<=NMAX;i++) | ~^~~~~~ main.cpp:23:17: warning: iteration 1000003 invokes undefined behavior [-Waggressive-loop-optimizations] 23 | if(phi[i]==i) | ~~~~~^ main.cpp:22:14: note: within this loop 22 | for(i=2;i<=NMAX;i++) | ~^~~~~~ main.cpp: In function 'int main()': main.cpp:36:28: warning: iteration 1000004 invokes undefined behavior [-Waggressive-loop-optimizations] 36 | dp[i]=dp[i-1]+phi[i]; | ~~~~~^ main.cpp:35:14: note: within this loop 35 | for(i=1;i<=NMAX;i++) | ~^~~~~~