Compilare: main.cpp: In function 'int main()': main.cpp:3:42: warning: statement has no effect [-Wunused-value] 3 | int main(){int n,i=3,a=1,b=2,c;f>>n;for(i<=n;i++;){c=b;b=(b+a+1)%9001;a=c;}g<<b;} | ~^~~ main.cpp:3:47: warning: iteration 2147483644 invokes undefined behavior [-Waggressive-loop-optimizations] 3 | int main(){int n,i=3,a=1,b=2,c;f>>n;for(i<=n;i++;){c=b;b=(b+a+1)%9001;a=c;}g<<b;} | ~^~ main.cpp:3:47: note: within this loop