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- #include <bits/stdc++.h>
- using namespace std;
- int main() {
- int n , x;
- cin >> n >>x;
- int a[n];
- for (int i = 0; i < n; i++)cin >> a[i];
- int start = 0;
- int end = n-1;
- int ans = -1;
- while(start <= end){
- int mid = (start + end) / 2;
- if(a[mid] < x){
- start = mid+1;
- }else if(a[mid] > x){
- end = mid - 1;
- }else{
- ans = mid;
- break;
- }
- }
- cout<<ans<<"\n";
- return 0;
- }
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