Problem p01465 (C++)

Buggy submission (status: Memory Limit Exceeded):
#include "bits/stdc++.h"
#include <unordered_map>
#include <unordered_set>
#pragma warning(disable : 4996)
using namespace std;
using ld = long double;
template <class T> using Table = vector<vector<T>>;
const ld eps = 1e-9;

// < "D:\D_Download\Visual Studio
// 2015\Projects\programing_contest_c++\Debug\a.txt" > "D:\D_Download\Visual
// Studio 2015\Projects\programing_contest_c++\Debug\b.answer"

const int mod = 1000000007;
struct Mod {
public:
  int num;
  Mod() : Mod(0) { ; }
  Mod(long long int n) : num((n % mod + mod) % mod) {
    static_assert(mod < INT_MAX / 2,
                  "mod is too big, please make num 'long long int' from 'int'");
  }
  Mod(int n) : Mod(static_cast<long long int>(n)) { ; }
  operator int() { return num; }
};

Mod operator+(const Mod a, const Mod b) { return Mod((a.num + b.num) % mod); }
Mod operator+(const long long int a, const Mod b) { return Mod(a) + b; }
Mod operator+(const Mod a, const long long int b) { return b + a; }
Mod operator++(Mod &a) { return a + Mod(1); }
Mod operator-(const Mod a, const Mod b) {
  return Mod((mod + a.num - b.num) % mod);
}
Mod operator-(const long long int a, const Mod b) { return Mod(a) - b; }
Mod operator--(Mod &a) { return a - Mod(1); }
Mod operator*(const Mod a, const Mod b) {
  return Mod(((long long)a.num * b.num) % mod);
}
Mod operator*(const long long int a, const Mod b) { return Mod(a) * b; }
Mod operator*(const Mod a, const long long int b) { return Mod(b) * a; }
Mod operator*(const Mod a, const int b) { return Mod(b) * a; }
Mod operator+=(Mod &a, const Mod b) { return a = a + b; }
Mod operator+=(long long int &a, const Mod b) { return a = a + b; }
Mod operator-=(Mod &a, const Mod b) { return a = a - b; }
Mod operator-=(long long int &a, const Mod b) { return a = a - b; }
Mod operator*=(Mod &a, const Mod b) { return a = a * b; }
Mod operator*=(long long int &a, const Mod b) { return a = a * b; }
Mod operator*=(Mod &a, const long long int &b) { return a = a * b; }
Mod operator^(const Mod a, const int n) {
  if (n == 0)
    return Mod(1);
  Mod res = (a * a) ^ (n / 2);
  if (n % 2)
    res = res * a;
  return res;
}
Mod mod_pow(const Mod a, const int n) {
  if (n == 0)
    return Mod(1);
  Mod res = mod_pow((a * a), (n / 2));
  if (n % 2)
    res = res * a;
  return res;
}
Mod inv(const Mod a) { return a ^ (mod - 2); }
Mod operator/(const Mod a, const Mod b) {
  assert(b.num != 0);
  return a * inv(b);
}
Mod operator/(const long long int a, const Mod b) { return Mod(a) / b; }
Mod operator/=(Mod &a, const Mod b) { return a = a / b; }

#define MAX_MOD_N 1024000

Mod fact[MAX_MOD_N], factinv[MAX_MOD_N];
void init(const int amax = MAX_MOD_N) {
  fact[0] = Mod(1);
  factinv[0] = 1;
  for (int i = 0; i < amax - 1; ++i) {
    fact[i + 1] = fact[i] * Mod(i + 1);
    factinv[i + 1] = factinv[i] / Mod(i + 1);
  }
}
Mod comb(const int a, const int b) {
  return fact[a] * factinv[b] * factinv[a - b];
}

string st;
int a;
pair<int, int> getexpr();
pair<int, int> getval() {
  assert(st[a] == 'x');
  a++;
  int num = 0;
  while (a != st.size() && isdigit(st[a])) {
    num = num * 10 + st[a] - '0';
    a++;
  }
  return make_pair(1, 1);
}
pair<int, int> getfact() {
  if (st[a] == '~') {
    a++;
    auto p = getfact();
    return make_pair(p.second, p.first);
  } else if (st[a] == '(') {
    a++;
    auto p(getexpr());
    a++;
    return p;
  } else {
    auto p(getval());
    return p;
  }
}
pair<int, int> getterm() {
  auto p = getfact();
  while (a != st.size()) {
    if (st[a] == '|' || st[a] == ')')
      return p;
    else if (st[a] == '&') {
      a++;
      auto q = getfact();
      long long int aa = p.first, ab = p.second, ba = q.first, bb = q.second;
      long long int fst = ba * aa;
      long long int scd = (aa + ab) * (ba + bb) - ba * aa;

      p = make_pair(fst % mod, scd % mod);
    }
  }
  return p;
}
pair<int, int> getexpr() {
  auto p(getterm());
  while (a != st.size()) {
    if (st[a] == '|') {
      a++;
      auto q = getterm();
      long long int aa = p.first, ab = p.second, ba = q.first, bb = q.second;
      long long int fst = (aa + ab) * (ba + bb) - bb * ab;
      long long int scd = bb * ab;
      p = make_pair(fst % mod, scd % mod);
    } else if (st[a] == ')') {
      break;
    } else {
      break;
      assert(false);
    }
  }
  return p;
}
long long int eord, enew;
int main() {
  const int SZ = 128 * 1024 * 1024;
  void *p = malloc(SZ);
  enew = (long long)p + SZ - 1;

  __asm__("mov %rsp, eord");
  __asm__("mov enew, %rsp");

  cin >> st;
  a = 0;
  int ans = getexpr().first;
  cout << ans << endl;
  __asm__("mov eord, %rsp");
  return 0;
}

Fixed submission:
#include "bits/stdc++.h"
#include <unordered_map>
#include <unordered_set>
#pragma warning(disable : 4996)
using namespace std;
using ld = long double;
template <class T> using Table = vector<vector<T>>;
const ld eps = 1e-9;

// < "D:\D_Download\Visual Studio
// 2015\Projects\programing_contest_c++\Debug\a.txt" > "D:\D_Download\Visual
// Studio 2015\Projects\programing_contest_c++\Debug\b.answer"

const int mod = 1000000007;

string st;
int a;
pair<int, int> getexpr();
pair<int, int> getval() {
  assert(st[a] == 'x');
  a++;
  int num = 0;
  while (a != st.size() && isdigit(st[a])) {
    num = num * 10 + st[a] - '0';
    a++;
  }
  return make_pair(1, 1);
}
pair<int, int> getfact() {
  if (st[a] == '~') {
    a++;
    auto p = getfact();
    return make_pair(p.second, p.first);
  } else if (st[a] == '(') {
    a++;
    auto p(getexpr());
    a++;
    return p;
  } else {
    auto p(getval());
    return p;
  }
}
pair<int, int> getterm() {
  auto p = getfact();
  while (a != st.size()) {
    if (st[a] == '|' || st[a] == ')')
      return p;
    else if (st[a] == '&') {
      a++;
      auto q = getfact();
      long long int aa = p.first, ab = p.second, ba = q.first, bb = q.second;
      long long int fst = ba * aa;
      long long int scd = (aa + ab) * (ba + bb) - ba * aa;

      p = make_pair(fst % mod, scd % mod);
    }
  }
  return p;
}
pair<int, int> getexpr() {
  auto p(getterm());
  while (a != st.size()) {
    if (st[a] == '|') {
      a++;
      auto q = getterm();
      long long int aa = p.first, ab = p.second, ba = q.first, bb = q.second;
      long long int fst = (aa + ab) * (ba + bb) - bb * ab;
      long long int scd = bb * ab;
      p = make_pair(fst % mod, scd % mod);
    } else if (st[a] == ')') {
      break;
    } else {
      break;
      assert(false);
    }
  }
  return p;
}
long long int eord, enew;
int main() {
  const int SZ = 128 * 1024 * 1024;
  void *p = malloc(SZ);
  enew = (long long)p + SZ - 1;

  __asm__("mov %rsp, eord");
  __asm__("mov enew, %rsp");

  cin >> st;
  a = 0;
  int ans = getexpr().first;
  cout << ans << endl;
  __asm__("mov eord, %rsp");
  return 0;
}