Compilare: main.cpp: In function 'bool isPrime(long long int)': main.cpp:16:44: warning: suggest parentheses around '&&' within '||' [-Wparentheses] if (n % 2 == 0 || n % 3 == 0 && (n!=2) && (n!=3)) ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:27:29: warning: 'ct' may be used uninitialized in this function [-Wmaybe-uninitialized] {long long a,b,i,firstprime,ct,fsafis; ^~ main.cpp:41:14: warning: 'firstprime' may be used uninitialized in this function [-Wmaybe-uninitialized] { if((ct-firstprime)>difmax) ~~~^~~~~~~~~~~~