number_theory/test/binary_gcd_stress.test.cpp

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Last update: 2025-06-28 10:05:47+09:00
Problem: https://onlinejudge.u-aizu.ac.jp/courses/lesson/2/ITP1/1/ITP1_1_A

Depends on

Code

#define PROBLEM "https://onlinejudge.u-aizu.ac.jp/courses/lesson/2/ITP1/1/ITP1_1_A"
#define FAST_IO
#define FIX_SEED

#include "../../template/template.hpp"
#include "../../template/random.hpp"
#include "../../number_theory/binary_gcd.hpp"

void test() {
    constexpr int ITER = 1'000'000;
    for (int t = 0; t < ITER; ++t) {
        u64 a = mt();
        u64 b = mt();
        assert(gcd(a, b) == binary_gcd(a, b));
    }
    constexpr int RANGE = 1000;
    for (int i = 0; i < RANGE; ++i) {
        for (int j = 0; j < RANGE; ++j) {
            assert(gcd(i, j) == binary_gcd(i, j));
        }
    }
}

int main() {
    test();
    cout << "Hello World\n";
}

#line 1 "number_theory/test/binary_gcd_stress.test.cpp"
#define PROBLEM "https://onlinejudge.u-aizu.ac.jp/courses/lesson/2/ITP1/1/ITP1_1_A"
#define FAST_IO
#define FIX_SEED

#line 2 "template/template.hpp"
#include <bits/stdc++.h>
#define OVERRIDE(a, b, c, d, ...) d
#define REP2(i, n) for (i32 i = 0; i < (i32)(n); ++i)
#define REP3(i, m, n) for (i32 i = (i32)(m); i < (i32)(n); ++i)
#define REP(...) OVERRIDE(__VA_ARGS__, REP3, REP2)(__VA_ARGS__)
#define PER2(i, n) for (i32 i = (i32)(n)-1; i >= 0; --i)
#define PER3(i, m, n) for (i32 i = (i32)(n)-1; i >= (i32)(m); --i)
#define PER(...) OVERRIDE(__VA_ARGS__, PER3, PER2)(__VA_ARGS__)
#define ALL(x) begin(x), end(x)
#define LEN(x) (i32)(x.size())
using namespace std;
using u32 = unsigned int;
using u64 = unsigned long long;
using i32 = signed int;
using i64 = signed long long;
using f64 = double;
using f80 = long double;
using pi = pair<i32, i32>;
using pl = pair<i64, i64>;
template <typename T>
using V = vector<T>;
template <typename T>
using VV = V<V<T>>;
template <typename T>
using VVV = V<V<V<T>>>;
template <typename T>
using VVVV = V<V<V<V<T>>>>;
template <typename T>
using PQR = priority_queue<T, V<T>, greater<T>>;
template <typename T>
bool chmin(T &x, const T &y) {
    if (x > y) {
        x = y;
        return true;
    }
    return false;
}
template <typename T>
bool chmax(T &x, const T &y) {
    if (x < y) {
        x = y;
        return true;
    }
    return false;
}
template <typename T>
i32 lob(const V<T> &arr, const T &v) {
    return (i32)(lower_bound(ALL(arr), v) - arr.begin());
}
template <typename T>
i32 upb(const V<T> &arr, const T &v) {
    return (i32)(upper_bound(ALL(arr), v) - arr.begin());
}
template <typename T>
V<i32> argsort(const V<T> &arr) {
    V<i32> ret(arr.size());
    iota(ALL(ret), 0);
    sort(ALL(ret), [&](i32 i, i32 j) -> bool {
        if (arr[i] == arr[j]) {
            return i < j;
        } else {
            return arr[i] < arr[j];
        }
    });
    return ret;
}
#ifdef INT128
using u128 = __uint128_t;
using i128 = __int128_t;
#endif
[[maybe_unused]] constexpr i32 INF = 1000000100;
[[maybe_unused]] constexpr i64 INF64 = 3000000000000000100;
struct SetUpIO {
    SetUpIO() {
#ifdef FAST_IO
        ios::sync_with_stdio(false);
        cin.tie(nullptr);
#endif
        cout << fixed << setprecision(15);
    }
} set_up_io;
void scan(char &x) { cin >> x; }
void scan(u32 &x) { cin >> x; }
void scan(u64 &x) { cin >> x; }
void scan(i32 &x) { cin >> x; }
void scan(i64 &x) { cin >> x; }
void scan(f64 &x) { cin >> x; }
void scan(string &x) { cin >> x; }
template <typename T>
void scan(V<T> &x) {
    for (T &ele : x) {
        scan(ele);
    }
}
void read() {}
template <typename Head, typename... Tail>
void read(Head &head, Tail &...tail) {
    scan(head);
    read(tail...);
}
#define CHAR(...)     \
    char __VA_ARGS__; \
    read(__VA_ARGS__);
#define U32(...)     \
    u32 __VA_ARGS__; \
    read(__VA_ARGS__);
#define U64(...)     \
    u64 __VA_ARGS__; \
    read(__VA_ARGS__);
#define I32(...)     \
    i32 __VA_ARGS__; \
    read(__VA_ARGS__);
#define I64(...)     \
    i64 __VA_ARGS__; \
    read(__VA_ARGS__);
#define F64(...)     \
    f64 __VA_ARGS__; \
    read(__VA_ARGS__);
#define STR(...)        \
    string __VA_ARGS__; \
    read(__VA_ARGS__);
#define VEC(type, name, size) \
    V<type> name(size);       \
    read(name);
#define VVEC(type, name, size1, size2)    \
    VV<type> name(size1, V<type>(size2)); \
    read(name);
#line 4 "template/random.hpp"

#if defined(LOCAL) || defined(FIX_SEED)
std::mt19937_64 mt(123456789);
#else
std::mt19937_64 mt(std::chrono::steady_clock::now().time_since_epoch().count());
#endif

template <typename T>
T uniform(T l, T r) {
    return std::uniform_int_distribution<T>(l, r - 1)(mt);
}
template <typename T>
T uniform(T n) {
    return std::uniform_int_distribution<T>(0, n - 1)(mt);
}
#line 2 "number_theory/binary_gcd.hpp"

unsigned long long binary_gcd(unsigned long long x, unsigned long long y) {
    if (x == 0) {
        return y;
    }
    if (y == 0) {
        return x;
    }
    int a = __builtin_ctz(x);
    int b = __builtin_ctz(y);
    x >>= a;
    y >>= b;
    while (x != y) {
        int m = __builtin_ctz(x - y);
        if (x > y) {
            x = (x - y) >> m;
        } else {
            y = (y - x) >> m;
        }
    }
    return x << (a < b ? a : b);
}
#line 8 "number_theory/test/binary_gcd_stress.test.cpp"

void test() {
    constexpr int ITER = 1'000'000;
    for (int t = 0; t < ITER; ++t) {
        u64 a = mt();
        u64 b = mt();
        assert(gcd(a, b) == binary_gcd(a, b));
    }
    constexpr int RANGE = 1000;
    for (int i = 0; i < RANGE; ++i) {
        for (int j = 0; j < RANGE; ++j) {
            assert(gcd(i, j) == binary_gcd(i, j));
        }
    }
}

int main() {
    test();
    cout << "Hello World\n";
}