Compilare: main.cpp: In function 'int main()': main.cpp:26:19: warning: unused variable 'ans' [-Wunused-variable] int a, b, ans=0; ^~~ main.cpp:23:20: warning: iteration 99999999 invokes undefined behavior [-Waggressive-loop-optimizations] v[i]+=v[i-1]; ^ main.cpp:22:18: note: within this loop for(int i=1;i<=100000000;i++){ ~^~~~~~~~~~~ main.cpp:13:18: warning: iteration 100003 invokes undefined behavior [-Waggressive-loop-optimizations] if(ciur[i]==0){ ~~~~~~^ main.cpp:12:24: note: within this loop for(long long i=2;i<=1000000;i++){ ~^~~~~~~~~