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- #include<iostream>
- #include<vector>
- using namespace std;
- int transitionPoint(vector<int> &v){
- int l = 0, r = v.size();
- int leftmost = 0;
- while(l <= r){
- int mid = l + (r - l) / 2;
- if(v[mid] == 0){
- l = mid + 1;
- }
- else{
- leftmost = mid;
- r = mid - 1;
- }
- }
- return leftmost;
- }
- int main()
- {
- int n;
- cin >> n;
- vector<int> v(n);
- for(int i = 0; i < n; i++){
- cin >> v[i];
- }
- cout << transitionPoint(v) << '\n';
- return 0;
- }
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