Created
November 7, 2018 08:49
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| /* | |
| * CodeChef TAAND | |
| * link: https://www.codechef.com/problems/TAAND | |
| * editorial: https://discuss.codechef.com/questions/48551/taand-editorial | |
| */ | |
| #include <stdio.h> | |
| #include <bits/stdc++.h> | |
| #define fin freopen("input", "r", stdin) | |
| #include <vector> | |
| using namespace std; | |
| int n; | |
| int sol(int index, vector<int>& ar, vector<int>& flag) { | |
| // basecase | |
| if (index == -1) return 0; | |
| int ans = 0; | |
| int total = 0; | |
| for (int i = 0; i < n; ++i) { | |
| if (flag[i] == 0) { | |
| if (ar[i] & (1 << index)) { | |
| total++; | |
| } | |
| } | |
| } | |
| if (total >= 2) { | |
| ans += (1 << index); | |
| for (int i = 0; i < n; ++i) { | |
| if ((ar[i] & (1 << index)) == 0) { | |
| flag[i] = 1; | |
| } | |
| } | |
| } | |
| return ans + sol(index - 1, ar, flag); | |
| } | |
| int main() | |
| { | |
| cin >> n; | |
| vector<int> ar(n); | |
| vector<int> flag(n); | |
| //for (int i = 0; i < n; ++i) cin >> ar[i]; | |
| for (int& x : ar) cin >> x; | |
| cout << sol(30, ar, flag) << endl; | |
| return 0; | |
| } |
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