Problem p01552 (C++) — buggy submission, verdict: Runtime Error

#include <bits/stdc++.h>

#define _overload(_1, _2, _3, name, ...) name
#define _rep(i, n) _range(i, 0, n)
#define _range(i, a, b) for (int i = (int)(a); i < (int)(b); ++i)
#define rep(...) _overload(__VA_ARGS__, _range, _rep, )(__VA_ARGS__)

#define _rrep(i, n) _rrange(i, n, 0)
#define _rrange(i, a, b) for (int i = (int)(a)-1; i >= (int)(b); --i)
#define rrep(...) _overload(__VA_ARGS__, _rrange, _rrep, )(__VA_ARGS__)

#define _all(arg) begin(arg), end(arg)
#define uniq(arg) sort(_all(arg)), (arg).erase(unique(_all(arg)), end(arg))
#define getidx(ary, key) lower_bound(_all(ary), key) - begin(ary)
#define clr(a, b) memset((a), (b), sizeof(a))
#define bit(n) (1LL << (n))

// #define DEBUG

#ifdef DEBUG
#define dump(...) fprintf(stderr, __VA_ARGS__)
#else
#define dump(...)
#endif

template <class T> bool chmax(T &a, const T &b) {
  return (a < b) ? (a = b, 1) : 0;
}
template <class T> bool chmin(T &a, const T &b) {
  return (b < a) ? (a = b, 1) : 0;
}

using namespace std;
using ll = long long;
using vi = vector<int>;
using vll = vector<ll>;

const double EPS = 1e-10;
const double PI = acos(-1.0);
const ll inf = 1LL << 62;
const ll mod = 1000000007LL;
const int dx[4] = {1, 0, -1, 0};
const int dy[4] = {0, 1, 0, -1};

ll extgcd(ll a, ll b, ll &x, ll &y) {
  x = 1, y = 0;
  ll g = a;
  if (b != 0)
    g = extgcd(b, a % b, y, x), y -= a / b * x;
  return g;
}
ll ADD(const ll &a, const ll &b, const ll &mod) { return (a + b) % mod; }
ll SUB(const ll &a, const ll &b, const ll &mod) { return (a - b + mod) % mod; }
ll MUL(const ll &a, const ll &b, const ll &mod) { return (1LL * a * b) % mod; }
ll DIV(const ll &a, const ll &b, const ll &mod) {
  ll x, y;
  extgcd(b, mod, x, y);
  return MUL(a, (x + mod) % mod, mod);
}

random_device rd;
mt19937 mt(rd());
uniform_int_distribution<int> dice(1, 6);
uniform_real_distribution<double> score(0.0, 10.0);

int main(void) {
  vector<string> dir;
  {
    string str;
    cin >> str;
    str.push_back('.');
    int p = 1;
    int np;
    while ((np = str.find('.', p)) != string::npos) {
      dir.push_back(str.substr(p, np - p));
      p = np + 1;
    }
  }
  int len = dir.size();

  cin.ignore();

  int depth = 0;
  string in;
  int correct = -1;
  int pbcnt = 0;
  vi brs = {0};
  while (getline(cin, in)) {
    int bcnt = 0;
    while (in[bcnt] == ' ')
      bcnt++;
    if (bcnt > brs.back())
      depth++, brs.push_back(bcnt);
    while (bcnt < brs.back()) {
      brs.pop_back();
      depth--;
    }

    if (correct >= depth)
      correct = depth - 1;

    stringstream ss(in);
    string obj;
    ss >> obj;

    obj.pop_back();
    if (correct == depth - 1 and dir[depth] == obj) {
      correct = depth;
      if (correct == len - 1) {
        int si = in.find(':') + 2;
        if (si >= in.size()) {
          cout << "object" << endl;
        } else {
          string name = in.substr(in.find(':') + 2);
          cout << "string \\"" << name << "\\"" << endl;
        }
        return 0;
      }
    }
  }

  cout << "no such property" << endl;

  return 0;
}

Error: 0

Fixed submission:

#include <bits/stdc++.h>

#define _overload(_1, _2, _3, name, ...) name
#define _rep(i, n) _range(i, 0, n)
#define _range(i, a, b) for (int i = (int)(a); i < (int)(b); ++i)
#define rep(...) _overload(__VA_ARGS__, _range, _rep, )(__VA_ARGS__)

#define _rrep(i, n) _rrange(i, n, 0)
#define _rrange(i, a, b) for (int i = (int)(a)-1; i >= (int)(b); --i)
#define rrep(...) _overload(__VA_ARGS__, _rrange, _rrep, )(__VA_ARGS__)

#define _all(arg) begin(arg), end(arg)
#define uniq(arg) sort(_all(arg)), (arg).erase(unique(_all(arg)), end(arg))
#define getidx(ary, key) lower_bound(_all(ary), key) - begin(ary)
#define clr(a, b) memset((a), (b), sizeof(a))
#define bit(n) (1LL << (n))

// #define DEBUG

#ifdef DEBUG
#define dump(...) fprintf(stderr, __VA_ARGS__)
#else
#define dump(...)
#endif

template <class T> bool chmax(T &a, const T &b) {
  return (a < b) ? (a = b, 1) : 0;
}
template <class T> bool chmin(T &a, const T &b) {
  return (b < a) ? (a = b, 1) : 0;
}

using namespace std;
using ll = long long;
using vi = vector<int>;
using vll = vector<ll>;

const double EPS = 1e-10;
const double PI = acos(-1.0);
const ll inf = 1LL << 62;
const ll mod = 1000000007LL;
const int dx[4] = {1, 0, -1, 0};
const int dy[4] = {0, 1, 0, -1};

ll extgcd(ll a, ll b, ll &x, ll &y) {
  x = 1, y = 0;
  ll g = a;
  if (b != 0)
    g = extgcd(b, a % b, y, x), y -= a / b * x;
  return g;
}
ll ADD(const ll &a, const ll &b, const ll &mod) { return (a + b) % mod; }
ll SUB(const ll &a, const ll &b, const ll &mod) { return (a - b + mod) % mod; }
ll MUL(const ll &a, const ll &b, const ll &mod) { return (1LL * a * b) % mod; }
ll DIV(const ll &a, const ll &b, const ll &mod) {
  ll x, y;
  extgcd(b, mod, x, y);
  return MUL(a, (x + mod) % mod, mod);
}

random_device rd;
mt19937 mt(rd());
uniform_int_distribution<int> dice(1, 6);
uniform_real_distribution<double> score(0.0, 10.0);

int main(void) {
  vector<string> dir;
  {
    string str;
    cin >> str;
    str.push_back('.');
    int p = 1;
    int np;
    while ((np = str.find('.', p)) != string::npos) {
      dir.push_back(str.substr(p, np - p));
      p = np + 1;
    }
  }
  int len = dir.size();

  cin.ignore();

  int depth = 0;
  string in;
  int correct = -1;
  int pbcnt = 0;
  vi brs = {0};
  while (getline(cin, in)) {
    int bcnt = 0;
    while (in[bcnt] == ' ')
      bcnt++;
    if (bcnt > brs.back())
      depth++, brs.push_back(bcnt);
    while (bcnt < brs.back()) {
      brs.pop_back();
      depth--;
    }

    if (correct >= depth)
      correct = depth - 1;

    stringstream ss(in);
    string obj;
    ss >> obj;

    obj.pop_back();
    if (correct == depth - 1 and dir[depth] == obj) {
      correct = depth;
      if (correct == len - 1) {
        string name = in.substr(in.find(':') + 2);
        if (name == "") {
          cout << "object" << endl;
        } else {
          cout << "string \\"" << name << "\\"" << endl;
        }
        return 0;
      }
    }
  }

  cout << "no such property" << endl;

  return 0;
}