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temp
//g++ 5.4.0 #include <iostream> class A; class b { public: A *a() { std::cout << "from class A\n"; return aa; } A *aa; }; class A { public: b *B() { std::cout << "from class A\n"; return new b; } }; int main() { A a; b B; a.B(); B.a(); std::cout << "Hello, world!\n"; }
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Continuous Sub Set with given sum
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https://codeforces.com/contest/449/problem/D (INCLuSION EXCLUSION principle)
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