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#include <bits/stdc++.h> | |
using namespace std; | |
int B(int x) { | |
x = ((x >> 16) | x) & 0xFFFF; | |
x = ((x >> 8) | x) & 0xFF; | |
x = ((x >> 4) | x) & 0xF; | |
x = ((x >> 2) | x) & 0x3; | |
x = ((x >> 1) | x) & 0x1; | |
return x; | |
} | |
void Iter(int &a, int &b) { | |
int c = 1 - B(b); | |
int tmp = a % (b + c) + a * c; | |
a = b; | |
b = tmp; | |
} | |
int gcd(int a, int b) { | |
Iter(a, b), Iter(a, b), Iter(a, b), Iter(a, b), Iter(a, b); | |
Iter(a, b), Iter(a, b), Iter(a, b), Iter(a, b), Iter(a, b); | |
Iter(a, b), Iter(a, b), Iter(a, b), Iter(a, b), Iter(a, b); | |
Iter(a, b), Iter(a, b), Iter(a, b), Iter(a, b), Iter(a, b); | |
Iter(a, b), Iter(a, b), Iter(a, b), Iter(a, b), Iter(a, b); | |
Iter(a, b), Iter(a, b), Iter(a, b), Iter(a, b), Iter(a, b); | |
Iter(a, b), Iter(a, b), Iter(a, b), Iter(a, b), Iter(a, b); | |
Iter(a, b), Iter(a, b), Iter(a, b), Iter(a, b), Iter(a, b); | |
Iter(a, b), Iter(a, b), Iter(a, b), Iter(a, b), Iter(a, b); | |
Iter(a, b), Iter(a, b), Iter(a, b), Iter(a, b), Iter(a, b); | |
return a + b; | |
} | |
int main() { | |
assert(gcd(5, 10) == 5); | |
assert(gcd(60, 36) == 12); | |
assert(gcd(0, 12) == 12); | |
assert(gcd(12, 0) == 12); | |
assert(gcd(0, 0) == 0); | |
assert(gcd(2147483647, 2147483647) == 2147483647); | |
} |
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