#include <bits/stdc++.h> using namespace std; vector<int> ask(int i); int find_best(int n) { int l=0, r=n-1, m; vector<int> ans; while(l!=r){ m=(l+r)/2; ans=ask(m); if(ans[0]==0 && ans[1]==0) return m; if(ans[0]==1) r=m-1; else l=m+1; } return l; } #ifndef EVAL static const int max_q = 10000; static int n; static int query_count = 0; static vector<int> g; static vector<vector<int> > rank_count; vector<int> ask(int i) { query_count++; if(query_count > max_q) { cerr << "Query limit exceeded" << endl; exit(0); } if(i < 0 || i >= n) { cerr << "Bad index: " << i << endl; exit(0); } vector<int> res(2); res[0] = rank_count[g[i] - 1][i + 1]; res[1] = rank_count[g[i] - 1][n] - res[0]; return res; } int main() { ifstream cin("input.txt"); cin >> n; g.resize(n); for(int i = 0; i < n; i++) { cin >> g[i]; if(g[i] < 1) { cerr << "Invalid rank " << g[i] << " at index " << i << endl; exit(0); } } int max_rank = *max_element(g.begin(), g.end()); rank_count.resize(max_rank + 1, vector<int>(n + 1, 0)); for(int r = 0; r <= max_rank; r++) { for(int i = 1; i <= n; i++) { rank_count[r][i] = rank_count[r][i - 1]; if(g[i - 1] == r) rank_count[r][i]++; } } for(int i = 0; i <= n; i++) for(int r = 1; r <= max_rank; r++) rank_count[r][i] += rank_count[r - 1][i]; int res = find_best(n); cout << res << endl << "Query count: " << query_count << endl; return 0; } #endif