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#### About

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

```
int gcd(int a, int b) {
while(b != 0) {
int n = b;
b = a % b;
a = n;
}
return a;
}
```

Just practising some ~\LaTeX~

~e^{i\theta} = i\sin\theta + \cos\theta~

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