Compilare: main.cpp: In function 'void sieve()': main.cpp:12:6: warning: unused variable 'cnt' [-Wunused-variable] 12 | int cnt = 0; | ^~~ main.cpp: In function 'void solve()': main.cpp:28:6: warning: init-statement in selection statements only available with '-std=c++17' or '-std=gnu++17' 28 | if (ll a = sqrt(x); a * a == x) { | ^~