func_code_string: #include <bits/stdc++.h>   using namespace std;   const long long mod = 1e9 + 7;   int trie[5000005][2];   int n, cnt;   inline int read() {     int t = 0;     char ch = getchar();     while (ch <  0  || ch >  9 ) {       ch = getchar();     }     while (ch >=  0  && ch <=  9 ) {       t = (t << 3) + (t << 1) + (ch ^ 48);       ch = getchar();     }     return t;   }   inline void write(int t) {     if (t > 9) {       write(t / 10);     }     putchar(t % 10 +  0 );   }   inline void insert(int t) {     int pos = 0;     for (int i = 29; i >= 0; i--) {       int x = (t >> i) & 1;       if (!trie[pos][x]) {         trie[pos][x] = ++cnt;       }       pos = trie[pos][x];     }   }   inline int solve(int t, int cur) {     if (t == -1) {       return 0;     }     if (!trie[cur][0]) {       return solve(t - 1, trie[cur][1]);     } else if (!trie[cur][1]) {       return solve(t - 1, trie[cur][0]);     } else {       return (1 << t) +              min(solve(t - 1, trie[cur][0]), solve(t - 1, trie[cur][1]));     }   }   int main() {     n = read();     while (n--) {       insert(read());     }     write(solve(29, 0));     putchar(10);     return 0;   }   