Compilare: user.cpp: In function ‘void Peridot()’: user.cpp:32:20: warning: unused variable ‘k’ [-Wunused-variable] int i, j; bool k; ^ user.cpp: In function ‘int main()’: user.cpp:42:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("frac.in", "r", stdin); ^ user.cpp:43:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("frac.out", "w", stdout); ^ user.cpp:44:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld", &N, &P); ^ user.cpp: In function ‘void Peridot()’: user.cpp:34:19: warning: iteration 110003 invokes undefined behavior [-Waggressive-loop-optimizations] if(!Ciur[i]){for(j=2*i; j<=110005; j+=i)Ciur[j]=1; ~~~~~~^ user.cpp:33:15: note: within this loop for(i=2; i<=110005; i++){ ~^~~~~~~~