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- #include <iostream>
- using namespace std;
- int n, x;
- int a[10000000];
- int go(int l, int r) {
- int m = (l + r) / 2;
- if (l > r)
- return -1;
- if (a[m] > x)
- return go(l, m - 1);
- else if (a[m] < x)
- return go(m + 1, r);
- else
- return m;
- }
- int main() {
- cin >> n >> x;
- for (int i = 1; i <= n; i++)
- cin >> a[i];
- cout << go(1, n);
- }
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