Compilare: main.cpp: In function 'int main()': main.cpp:12:21: warning: comparison of integer expressions of different signedness: 'int' and 'long long unsigned int' [-Wsign-compare] 12 | for(int i = 4 ; i <= n; i=i+2) | ~~^~~~ main.cpp:17:20: warning: comparison of integer expressions of different signedness: 'int' and 'long long unsigned int' [-Wsign-compare] 17 | for(int i = 3; i <= n; i=i + 2) | ~~^~~~ main.cpp:20:30: warning: comparison of integer expressions of different signedness: 'int' and 'long long unsigned int' [-Wsign-compare] 20 | for(int j = i * i; j <= n; j = j + 2 * i) | ~~^~~~ main.cpp:23:22: warning: comparison of integer expressions of different signedness: 'int' and 'long long unsigned int' [-Wsign-compare] 23 | for(int i = 2; i <= n; i++) | ~~^~~~