func_code_string: #include <bits/stdc++.h>   using namespace std;   inline long long readLL() {     long long n = 0;     int ch = getchar();     while (!isdigit(ch)) ch = getchar();     while (isdigit(ch)) n = n * 10 + ch -  0 , ch = getchar();     return n;   }   const int MAX_N = 500000 + 3, MAX_LOG_V = 61;   int n;   long long a[MAX_N], b[MAX_LOG_V];   int main() {     n = readLL();     long long v = 0;     for (int i = 0; i < n; ++i) {       a[i] = readLL(), v ^= a[i];       a[i] ^= readLL();     }     int cnt = 0;     for (int i = 0; i < n; ++i)       for (int j = MAX_LOG_V - 1; j >= 0; --j)         if (a[i] >> j & 1) {           if (b[j])             a[i] ^= b[j];           else {             b[j] = a[i];             ++cnt;             break;           }         }     long long nowV = 0;     for (int i = MAX_LOG_V - 1; i >= 0; --i)       if ((v >> i & 1) != (nowV >> i & 1)) nowV ^= b[i];     if (nowV != v)       puts( 1/1 );     else       printf( %lld/%lld , (1LL << cnt) - 1, 1LL << cnt);     return 0;   }   