Problem p02996 (C++)

Buggy submission (status: Runtime Error):
#ifndef LOCAL
#pragma GCC optimize("Ofast")
#endif
#include <algorithm>
#include <bitset>
#include <cassert>
#include <complex>
#include <deque>
#include <functional>
#include <iomanip>
#include <iostream>
#include <list>
#include <map>
#include <queue>
#include <random>
#include <set>
#include <stack>
#include <unordered_map>
#include <unordered_set>

using namespace std;
using i64 = int_fast64_t;
using pii = pair<int, int>;
using pli = pair<int_fast64_t, int>;
using pll = pair<int_fast64_t, int_fast64_t>;
template <class T> using heap = priority_queue<T>;
template <class T> using minheap = priority_queue<T, vector<T>, greater<T>>;
template <class T>
constexpr T inf = numeric_limits<T>::max() / (T)2 - (T)123456;
constexpr int dx[9] = {1, 0, -1, 0, 1, -1, -1, 1, 0};
constexpr int dy[9] = {0, 1, 0, -1, 1, 1, -1, -1, 0};
constexpr long double Pi = 3.1415926535897932384626433832795;
constexpr long double Golden = 1.61803398874989484820;
constexpr long double eps = 1e-15;

#define iostream_untie true
#define mod 1000000007LL
#define stdout_precision 10
#define stderr_precision 10
#define itrep(i, v) for (auto i = begin(v); i != end(v); ++i)
#define ritrep(i, v) for (auto i = rbegin(v); i != rend(v); ++i)
#define rep(i, n) for (int_fast64_t i = 0; i < (int_fast64_t)(n); ++i)
#define rrep(i, n) for (int_fast64_t i = (int_fast64_t)(n)-1; i >= 0; --i)
#define all(v) begin(v), end(v)
#define rall(v) rbegin(v), rend(v)
#define fir first
#define sec second
#define u_map unordered_map
#define u_set unordered_set
#define l_bnd lower_bound
#define u_bnd upper_bound
#define emp emplace
#define emf emplace_front
#define emb emplace_back
#define pof pop_front
#define pob pop_back
#define mkp make_pair
#define mkt make_tuple
#define popcnt __builtin_popcount

namespace setup {
struct setupper {
  setupper() {
    if (iostream_untie) {
      ios::sync_with_stdio(false);
      std::cin.tie(nullptr);
      std::cout.tie(nullptr);
      std::cerr.tie(nullptr);
    }
    std::cout << std::fixed << std::setprecision(stdout_precision);
    std::cerr << std::fixed << std::setprecision(stderr_precision);
#ifdef LOCAL
    if (!freopen("stderr.txt", "wt", stderr)) {
      std::cerr << "Failed to open the stderr file\n";
      freopen("CON", "wt", stderr);
    }
    if (!freopen("stdout.txt", "wt", stdout)) {
      std::cerr << "Failed to open the stdout file\n";
      freopen("CON", "wt", stdout);
    }
    if (!freopen("stdin.txt", "rt", stdin)) {
      std::cerr << "Failed to open the stdin file.\n";
      freopen("CON", "rt", stdin);
    }
    // auto print_atexit = []() {
    //     std::cerr << "Exec time : " << clock() / (double)CLOCKS_PER_SEC *
    //     1000.0 << "ms\n"; std::cerr << "------------\n";
    // };
    // atexit((void(*)())print_atexit);
#endif
  }
} __setupper;
} // namespace setup

namespace std {
template <class RAitr> void rsort(RAitr __first, RAitr __last) {
  sort(__first, __last, greater<>());
}
template <class T> void hash_combine(size_t &seed, T const &key) {
  seed ^= hash<T>()(key) + 0x9e3779b9 + (seed << 6) + (seed >> 2);
}
template <class T, class U> struct hash<pair<T, U>> {
  size_t operator()(pair<T, U> const &pr) const {
    size_t seed = 0;
    hash_combine(seed, pr.first);
    hash_combine(seed, pr.second);
    return seed;
  }
};
template <class tuple_t, size_t index = tuple_size<tuple_t>::value - 1>
struct hashval_calc {
  static void apply(size_t &seed, tuple_t const &t) {
    hashval_calc<tuple_t, index - 1>::apply(seed, t);
    hash_combine(seed, get<index>(t));
  }
};
template <class tuple_t> struct hashval_calc<tuple_t, 0> {
  static void apply(size_t &seed, tuple_t const &t) {
    hash_combine(seed, get<0>(t));
  }
};
template <class... T> struct hash<tuple<T...>> {
  size_t operator()(tuple<T...> const &t) const {
    size_t seed = 0;
    hashval_calc<tuple<T...>>::apply(seed, t);
    return seed;
  }
};
} // namespace std

template <class T, class U> istream &operator>>(istream &s, pair<T, U> &p) {
  return s >> p.first >> p.second;
}
template <class T, class U>
ostream &operator<<(ostream &s, const pair<T, U> p) {
  return s << p.first << " " << p.second;
}
template <class T> istream &operator>>(istream &s, vector<T> &v) {
  for (T &e : v) {
    s >> e;
  }
  return s;
}
template <class T> ostream &operator<<(ostream &s, const vector<T> &v) {
  for (size_t i = 0; i < v.size(); ++i) {
    s << (i ? " " : "") << v[i];
  }
  return s;
}
template <class tuple_t, size_t index> struct tupleos {
  static ostream &apply(ostream &s, const tuple_t &t) {
    tupleos<tuple_t, index - 1>::apply(s, t);
    return s << " " << get<index>(t);
  }
};
template <class tuple_t> struct tupleos<tuple_t, 0> {
  static ostream &apply(ostream &s, const tuple_t &t) { return s << get<0>(t); }
};
template <class... T> ostream &operator<<(ostream &s, const tuple<T...> &t) {
  return tupleos<tuple<T...>, tuple_size<tuple<T...>>::value - 1>::apply(s, t);
}
template <> ostream &operator<<(ostream &s, const tuple<> &t) { return s; }
#define dump(...)                                                              \
  cerr << " [ " << __LINE__ << " : " << __FUNCTION__ << " ] " << #__VA_ARGS__  \
       << " : ";                                                               \
  dump_func(__VA_ARGS__)
template <class T> void dump_func(T x) { cerr << x << '\n'; }
template <class T, class... Rest> void dump_func(T x, Rest... rest) {
  cerr << x << ",";
  dump_func(rest...);
}
template <class T = i64> T read() {
  T x;
  return cin >> x, x;
}
template <class T> void write(T x) { cout << x << '\n'; }
template <class T, class... Rest> void write(T x, Rest... rest) {
  cout << x << ' ';
  write(rest...);
}
void writeln() {}
template <class T, class... Rest> void writeln(T x, Rest... rest) {
  cout << x << '\n';
  writeln(rest...);
}
#define esc(...) writeln(__VA_ARGS__), exit(0)

namespace updater {
template <class T> static void add(T &x, const T &y) { x += y; }
template <class T> static void ext_add(T &x, const T &y, size_t w) {
  x += y * w;
}
template <class T> static void mul(T &x, const T &y) { x *= y; }
template <class T> static void ext_mul(T &x, const T &y, size_t w) {
  x *= (T)pow(y, w);
}
template <class T> static bool chmax(T &x, const T &y) {
  return x < y ? x = y, true : false;
}
template <class T> static bool chmin(T &x, const T &y) {
  return x > y ? x = y, true : false;
}
}; // namespace updater
using updater::add;
using updater::chmax;
using updater::chmin;

template <class T> constexpr T minf(const T &x, const T &y) {
  return min(x, y);
}
template <class T> constexpr T maxf(const T &x, const T &y) {
  return max(x, y);
}
constexpr bool bit(i64 n, int e) { return (n >> e) & 1; }
constexpr int_fast64_t mask(int_fast64_t n, int e) {
  return n & ((1 << e) - 1);
}
constexpr int ilog(int_fast64_t x, int_fast64_t b = 2) {
  return x ? 1 + ilog(x / b, b) : -1;
}
int_fast64_t binry(int_fast64_t ok, int_fast64_t ng,
                   const function<bool(int_fast64_t)> &fn) {
  while (abs(ok - ng) > 1) {
    int_fast64_t mid = (ok + ng) / 2;
    (fn(mid) ? ok : ng) = mid;
  }
  return ok;
}
template <class A, size_t N, class T> void init(A (&array)[N], const T &val) {
  fill((T *)array, (T *)(array + N), val);
}
template <class T> vector<int> cmprs(const vector<T> &v) {
  vector<T> tmp = v;
  vector<int> ret;
  sort(begin(tmp), end(tmp));
  tmp.erase(unique(begin(tmp), end(tmp)), end(tmp));
  for (T i : v)
    ret.emplace_back(lower_bound(begin(tmp), end(tmp), i) - begin(tmp));
  return ret;
}
template <class T> vector<int> cmprs(const T *__first, const T *__last) {
  return cmprs(vector<T>(__first, __last));
}
void for_subset(int_fast64_t s, const function<void(int_fast64_t)> &fn) {
  int_fast64_t tmp = s;
  do {
    fn(tmp);
  } while ((--tmp &= s) != s);
}

/* The main code follows. */

int n;
pii tas[1 << 17];

signed main() {
  cin >> n;
  rep(i, n) { cin >> tas[i].sec >> tas[i].fir; }
  sort(tas, tas + n);
  int t = 0;
  rep(i, n) {
    t += tas[i].sec;
    if (t > tas[i].fir) {
      esc("No");
    }
  }
  esc("Yes");
}


Fixed submission:
#ifndef LOCAL
#pragma GCC optimize("Ofast")
#endif
#include <algorithm>
#include <bitset>
#include <cassert>
#include <complex>
#include <deque>
#include <functional>
#include <iomanip>
#include <iostream>
#include <list>
#include <map>
#include <queue>
#include <random>
#include <set>
#include <stack>
#include <unordered_map>
#include <unordered_set>

using namespace std;
using i64 = int_fast64_t;
using pii = pair<int, int>;
using pli = pair<int_fast64_t, int>;
using pll = pair<int_fast64_t, int_fast64_t>;
template <class T> using heap = priority_queue<T>;
template <class T> using minheap = priority_queue<T, vector<T>, greater<T>>;
template <class T>
constexpr T inf = numeric_limits<T>::max() / (T)2 - (T)123456;
constexpr int dx[9] = {1, 0, -1, 0, 1, -1, -1, 1, 0};
constexpr int dy[9] = {0, 1, 0, -1, 1, 1, -1, -1, 0};
constexpr long double Pi = 3.1415926535897932384626433832795;
constexpr long double Golden = 1.61803398874989484820;
constexpr long double eps = 1e-15;

#define iostream_untie true
#define mod 1000000007LL
#define stdout_precision 10
#define stderr_precision 10
#define itrep(i, v) for (auto i = begin(v); i != end(v); ++i)
#define ritrep(i, v) for (auto i = rbegin(v); i != rend(v); ++i)
#define rep(i, n) for (int_fast64_t i = 0; i < (int_fast64_t)(n); ++i)
#define rrep(i, n) for (int_fast64_t i = (int_fast64_t)(n)-1; i >= 0; --i)
#define all(v) begin(v), end(v)
#define rall(v) rbegin(v), rend(v)
#define fir first
#define sec second
#define u_map unordered_map
#define u_set unordered_set
#define l_bnd lower_bound
#define u_bnd upper_bound
#define emp emplace
#define emf emplace_front
#define emb emplace_back
#define pof pop_front
#define pob pop_back
#define mkp make_pair
#define mkt make_tuple
#define popcnt __builtin_popcount

namespace setup {
struct setupper {
  setupper() {
    if (iostream_untie) {
      ios::sync_with_stdio(false);
      std::cin.tie(nullptr);
      std::cout.tie(nullptr);
      std::cerr.tie(nullptr);
    }
    std::cout << std::fixed << std::setprecision(stdout_precision);
    std::cerr << std::fixed << std::setprecision(stderr_precision);
#ifdef LOCAL
    if (!freopen("stderr.txt", "wt", stderr)) {
      std::cerr << "Failed to open the stderr file\n";
      freopen("CON", "wt", stderr);
    }
    if (!freopen("stdout.txt", "wt", stdout)) {
      std::cerr << "Failed to open the stdout file\n";
      freopen("CON", "wt", stdout);
    }
    if (!freopen("stdin.txt", "rt", stdin)) {
      std::cerr << "Failed to open the stdin file.\n";
      freopen("CON", "rt", stdin);
    }
    // auto print_atexit = []() {
    //     std::cerr << "Exec time : " << clock() / (double)CLOCKS_PER_SEC *
    //     1000.0 << "ms\n"; std::cerr << "------------\n";
    // };
    // atexit((void(*)())print_atexit);
#endif
  }
} __setupper;
} // namespace setup

namespace std {
template <class RAitr> void rsort(RAitr __first, RAitr __last) {
  sort(__first, __last, greater<>());
}
template <class T> void hash_combine(size_t &seed, T const &key) {
  seed ^= hash<T>()(key) + 0x9e3779b9 + (seed << 6) + (seed >> 2);
}
template <class T, class U> struct hash<pair<T, U>> {
  size_t operator()(pair<T, U> const &pr) const {
    size_t seed = 0;
    hash_combine(seed, pr.first);
    hash_combine(seed, pr.second);
    return seed;
  }
};
template <class tuple_t, size_t index = tuple_size<tuple_t>::value - 1>
struct hashval_calc {
  static void apply(size_t &seed, tuple_t const &t) {
    hashval_calc<tuple_t, index - 1>::apply(seed, t);
    hash_combine(seed, get<index>(t));
  }
};
template <class tuple_t> struct hashval_calc<tuple_t, 0> {
  static void apply(size_t &seed, tuple_t const &t) {
    hash_combine(seed, get<0>(t));
  }
};
template <class... T> struct hash<tuple<T...>> {
  size_t operator()(tuple<T...> const &t) const {
    size_t seed = 0;
    hashval_calc<tuple<T...>>::apply(seed, t);
    return seed;
  }
};
} // namespace std

template <class T, class U> istream &operator>>(istream &s, pair<T, U> &p) {
  return s >> p.first >> p.second;
}
template <class T, class U>
ostream &operator<<(ostream &s, const pair<T, U> p) {
  return s << p.first << " " << p.second;
}
template <class T> istream &operator>>(istream &s, vector<T> &v) {
  for (T &e : v) {
    s >> e;
  }
  return s;
}
template <class T> ostream &operator<<(ostream &s, const vector<T> &v) {
  for (size_t i = 0; i < v.size(); ++i) {
    s << (i ? " " : "") << v[i];
  }
  return s;
}
template <class tuple_t, size_t index> struct tupleos {
  static ostream &apply(ostream &s, const tuple_t &t) {
    tupleos<tuple_t, index - 1>::apply(s, t);
    return s << " " << get<index>(t);
  }
};
template <class tuple_t> struct tupleos<tuple_t, 0> {
  static ostream &apply(ostream &s, const tuple_t &t) { return s << get<0>(t); }
};
template <class... T> ostream &operator<<(ostream &s, const tuple<T...> &t) {
  return tupleos<tuple<T...>, tuple_size<tuple<T...>>::value - 1>::apply(s, t);
}
template <> ostream &operator<<(ostream &s, const tuple<> &t) { return s; }
#define dump(...)                                                              \
  cerr << " [ " << __LINE__ << " : " << __FUNCTION__ << " ] " << #__VA_ARGS__  \
       << " : ";                                                               \
  dump_func(__VA_ARGS__)
template <class T> void dump_func(T x) { cerr << x << '\n'; }
template <class T, class... Rest> void dump_func(T x, Rest... rest) {
  cerr << x << ",";
  dump_func(rest...);
}
template <class T = i64> T read() {
  T x;
  return cin >> x, x;
}
template <class T> void write(T x) { cout << x << '\n'; }
template <class T, class... Rest> void write(T x, Rest... rest) {
  cout << x << ' ';
  write(rest...);
}
void writeln() {}
template <class T, class... Rest> void writeln(T x, Rest... rest) {
  cout << x << '\n';
  writeln(rest...);
}
#define esc(...) writeln(__VA_ARGS__), exit(0)

namespace updater {
template <class T> static void add(T &x, const T &y) { x += y; }
template <class T> static void ext_add(T &x, const T &y, size_t w) {
  x += y * w;
}
template <class T> static void mul(T &x, const T &y) { x *= y; }
template <class T> static void ext_mul(T &x, const T &y, size_t w) {
  x *= (T)pow(y, w);
}
template <class T> static bool chmax(T &x, const T &y) {
  return x < y ? x = y, true : false;
}
template <class T> static bool chmin(T &x, const T &y) {
  return x > y ? x = y, true : false;
}
}; // namespace updater
using updater::add;
using updater::chmax;
using updater::chmin;

template <class T> constexpr T minf(const T &x, const T &y) {
  return min(x, y);
}
template <class T> constexpr T maxf(const T &x, const T &y) {
  return max(x, y);
}
constexpr bool bit(i64 n, int e) { return (n >> e) & 1; }
constexpr int_fast64_t mask(int_fast64_t n, int e) {
  return n & ((1 << e) - 1);
}
constexpr int ilog(int_fast64_t x, int_fast64_t b = 2) {
  return x ? 1 + ilog(x / b, b) : -1;
}
int_fast64_t binry(int_fast64_t ok, int_fast64_t ng,
                   const function<bool(int_fast64_t)> &fn) {
  while (abs(ok - ng) > 1) {
    int_fast64_t mid = (ok + ng) / 2;
    (fn(mid) ? ok : ng) = mid;
  }
  return ok;
}
template <class A, size_t N, class T> void init(A (&array)[N], const T &val) {
  fill((T *)array, (T *)(array + N), val);
}
template <class T> vector<int> cmprs(const vector<T> &v) {
  vector<T> tmp = v;
  vector<int> ret;
  sort(begin(tmp), end(tmp));
  tmp.erase(unique(begin(tmp), end(tmp)), end(tmp));
  for (T i : v)
    ret.emplace_back(lower_bound(begin(tmp), end(tmp), i) - begin(tmp));
  return ret;
}
template <class T> vector<int> cmprs(const T *__first, const T *__last) {
  return cmprs(vector<T>(__first, __last));
}
void for_subset(int_fast64_t s, const function<void(int_fast64_t)> &fn) {
  int_fast64_t tmp = s;
  do {
    fn(tmp);
  } while ((--tmp &= s) != s);
}

/* The main code follows. */

int n;
pii tas[1 << 18];

signed main() {
  cin >> n;
  rep(i, n) { cin >> tas[i].sec >> tas[i].fir; }
  sort(tas, tas + n);
  int t = 0;
  rep(i, n) {
    t += tas[i].sec;
    if (t > tas[i].fir) {
      esc("No");
    }
  }
  esc("Yes");
}