Compilare: user.cpp: In function ‘int prim(int)’: user.cpp:19:14: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(a%2==0&&a>2||a<=1) return 0; ~~~~~~^~~~~ user.cpp: In function ‘void ciuri()’: user.cpp:58:18: warning: iteration 99998 invokes undefined behavior [-Waggressive-loop-optimizations] if(ciur[i]==0) ~~~~~~^ user.cpp:56:19: note: within this loop for(int i=2; i<=100000; i++) ~^~~~~~~~