Submission #1605456

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Source Code Expand

#include <iostream>
#include <cstdint>

using namespace std;

#define FOR(i, start, end) for(int i = (start); i < (end); ++i)
#define REP(i, n) FOR(i, 0, n)

class Hash {
public:
    Hash() : hash_(17) {}
    uint32_t get() const { return hash_; }
    void update(uint32_t x)
    {
        hash_ *= 31;
        hash_ += x;
    }
private:
    uint32_t hash_;
};

void yes()
{
    cout << "YES" << "\n";
    exit(0);
}

void re()
{
    abort();
}

void tle()
{
    for(;;);
}

void mle()
{
    yes();
#if 0
    for(;;)
        malloc(1000000);
#endif
}

int main()
{
    Hash h;

    int N, M;
    cin >> N >> M;
    h.update(N);
    h.update(M);

    REP(_, M) {
        int a, b;
        cin >> a >> b;
        h.update(a);
        h.update(b);
    }

    constexpr int shift = 0;
    auto bits = (h.get() >> shift) & 0b11;
    switch(bits) {
    case 0b00: yes(); break;
    case 0b01: re();  break;
    case 0b10: tle(); break;
    case 0b11: mle(); break;
    }

    return 0;
}

Submission Info

Judge Result