func_code_string: #include <bits/stdc++.h>   const int MAXN = 300011;   int N;   struct Pair {     int Val;     long long Mask;   } P[MAXN];   long long Sum;   int main() {     scanf( %d , &N);     for (int i = 1; i <= N; ++i) {       scanf( %d%I64d , &P[i].Val, &P[i].Mask);       Sum += P[i].Val;     }     if (Sum < 0LL) {       for (int i = 1; i <= N; ++i) P[i].Val = -P[i].Val;     }     long long Ans = 0LL, Tmp;     for (int i = 61; i >= 0; --i) {       Tmp = 0LL;       for (int j = 1; j <= N; ++j)         if ((P[j].Mask >> i) & 1 && ((P[j].Mask & ((1LL << i) - 1)) == 0))           Tmp += P[j].Val;       if (Tmp > 0LL) {         Ans ^= (1LL << i);         for (int j = 1; j <= N; ++j)           if ((P[j].Mask >> i) & 1) P[j].Val = -P[j].Val;       }     }     printf( %I64d n , Ans);     return 0;   }   