#include using namespace std; #define inf INT_MAX #define INF LLONG_MAX #define ll long long #define ull unsigned long long #define M (int)(1e9+7) #define P pair #define FOR(i,m,n) for(int i=(int)m;i<(int)n;i++) #define RFOR(i,m,n) for(int i=(int)m;i>=(int)n;i--) #define rep(i,n) FOR(i,0,n) #define rrep(i,n) RFOR(i,n,0) #define all(a) a.begin(),a.end() const int vx[4] = {0,1,0,-1}; const int vy[4] = {1,0,-1,0}; #define F first #define S second #define PB push_back #define EB emplace_back #define int ll #define vi vector #define IP pair #define PI pair #define PP pair #define Yes(f){cout<<(f?"Yes":"No")<>n; vi a(n); int s=0; rep(i,n){ cin>>a[i]; s=max(s,a[i]); } int t=1<<30; int x=0; while(t>0){ x+=t; int r=0; rep(i,n){ r=max(r,a[i]^x); } if(s>r) s=r; else x-=t; t>>=1; } cout<