x
using namespace std;
int main() {
printf("df\n");
return 0;
}
//在main函数之前执行
//lambda的动态创建执行
int _p = [](int&& a) { //万能引用传递
printf("hello %d!!!\n", forward<int&&>(a) );
return 0;
}(0);
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int _IO = []() {
std::ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
return 0;
}();