define long long int

在给定的代码中，使用了宏定义将int类型定义为long long类型。这意味着在代码中使用的int类型实际上是long long类型。这样做的目的是为了扩大int类型的取值范围，使其能够表示更大的整数。在这种情况下，主函数也需要变成signed main()，因为在没有这个定义的情况下，signed int = signed = int，所以int main() = signed main() = signed int main()，但是由于有了这个定义，int不再是int而是long long类型。\[1\]
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