Compilare: main.cpp: In function 'int main()': main.cpp:16:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 2; i <= nr / 2; ++i) ~~^~~~~~~~~ main.cpp:17:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 2; j <= nr / 2; ++j) { ~~^~~~~~~~~ main.cpp:19:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (a > nr && a - nr > dist) ~~^~~~ main.cpp:19:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (a > nr && a - nr > dist) ~~~~~~~^~~~~~ main.cpp:21:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (a <= nr && nr - a <= dist) { ~~^~~~~ main.cpp:21:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (a <= nr && nr - a <= dist) { ~~~~~~~^~~~~~~ main.cpp:25:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if (a > nr && a - nr < dist) { ~~^~~~ main.cpp:25:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if (a > nr && a - nr < dist) { ~~~~~~~^~~~~~