Compilare: main.cpp: In function 'int main()': main.cpp:52:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 2; i <= MaxX; ++i) ~~^~~~~~~ main.cpp:67:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 2; i <= MaxX; ++i) ~~^~~~~~~ main.cpp:69:23: warning: iteration 29999 invokes undefined behavior [-Waggressive-loop-optimizations] if (ciur[i]) ~~~~~~^ main.cpp:67:27: note: within this loop for (int i = 2; i <= MaxX; ++i) ~~^~~~~~~