Compilare: main.cpp: In function 'int main()': main.cpp:10:15: warning: unused variable 'x' [-Wunused-variable] 10 | long long x=0; | ^ main.cpp:12:28: warning: iteration 1000001 invokes undefined behavior [-Waggressive-loop-optimizations] 12 | for(i=1;i<=N;i++) fi[i]=i-1; | ~~~~~^~~~ main.cpp:12:14: note: within this loop 12 | for(i=1;i<=N;i++) fi[i]=i-1; | ^