func_code_string: #include <bits/stdc++.h>   using namespace std;   int dx[] = {0, 0, 1, -1};   int dy[] = {-1, 1, 0, 0};   template <class T>   T power(T N, T P) {     return (P == 0) ? 1 : N * power(N, P - 1);   }   template <class T>   T gcd(T a, T b) {     if (b == 0) return a;     return gcd(b, a % b);   }   struct debugger {     template <typename T>     debugger& operator,(const T& v) {       cerr << v <<    ;       return *this;     }   } dbg;   void make_unique(vector<int>& a) {     sort(a.begin(), a.end());     a.erase(unique(a.begin(), a.end()), a.end());   }   int on(int n, int pos) { return n = n | (1 << pos); }   void off(int& n, int pos) { n = n & ~(1 << pos); }   bool check(int n, int pos) { return (bool)(n & (1 << pos)); }   const int N = 1e5 + 10;   const int M = 64;   int id, cnt[M * N], a[N * M][5];   int new_node() {     for (int i = 0; i < 3; i++) {       a[id][i] = -1;     }     cnt[id] = 0;     return id++;   }   vector<int> bit(70);   void make(long long int x) {     bit.clear();     int i = 0;     while (x) {       bit.push_back(x % 2);       x /= 2LL;       i++;     }     while (i < M - 1) {       bit.push_back(0LL);       i++;     }     reverse(bit.begin(), bit.end());   }   void add(long long int x) {     make(x);     int cur = 0, typ;     for (int i = 0; i < M; i++) {       typ = bit[i];       if (a[cur][typ] == -1) {         a[cur][typ] = new_node();       }       cur = a[cur][typ];       ++cnt[cur];     }   }   void del(long long int x) {     make(x);     int cur = 0, typ;     for (int i = 0; i < M; i++) {       typ = bit[i];       cur = a[cur][typ];       --cnt[cur];     }   }   long long int query(long long int x) {     make(x);     int cur = 0, typ;     long long int ans = 0LL;     for (int i = 0; i < M; i++) {       typ = bit[i];       if (cnt[a[cur][!typ]] > 0) {         ans += (1LL << (M - i - 2));         cur = a[cur][!typ];       } else {         if (a[cur][typ] == -1) return ans;         cur = a[cur][typ];       }     }     return ans;   }   long long int arr[N];   int main() {     int n;     while (scanf( %d , &n) != EOF) {       id = 0;       new_node();       for (__typeof(n) i = 1; i <= n; i++) {         scanf( %lld , &arr[i]);       }       long long int xr = 0LL;       for (int i = n; i >= 1; i--) {         xr ^= arr[i];         add(xr);       }       long long int mx = 0LL;       long long int nw = 0LL;       mx = max(mx, query(nw));       for (int i = 1; i <= n; i++) {         nw ^= arr[i];         mx = max(mx, query(nw));         del(xr);         xr ^= arr[i];       }       printf( %lld n , mx);     }     return 0;   }   