Compilare: main.cpp: In function 'int main()': main.cpp:11:18: warning: comparison of integer expressions of different signedness: 'int' and 'unsigned int' [-Wsign-compare] 11 | for(int i=2;i<N;i++){ | ~^~ main.cpp:14:18: warning: comparison of integer expressions of different signedness: 'int' and 'unsigned int' [-Wsign-compare] 14 | for(int i=2;i<=N*N;i++){ | ~^~~~~ main.cpp:16:28: warning: comparison of integer expressions of different signedness: 'int' and 'unsigned int' [-Wsign-compare] 16 | for(int j=2;j*i<=N;j++){ | ~~~^~~ main.cpp:21:18: warning: comparison of integer expressions of different signedness: 'int' and 'unsigned int' [-Wsign-compare] 21 | for(int i=0;i<N;++i){ | ~^~ main.cpp:7:20: warning: unused variable 'x' [-Wunused-variable] 7 | unsigned int N,x,contor=0; | ^