Problem p02575 (C++)

Buggy submission (status: Runtime Error):
// #pragma GCC optimize ("O3","unroll-loops")
#include <cassert>
#include <cstdio>
#include <cstdlib>
#include <iomanip>
#include <iostream>

#include <algorithm>
#include <cmath>
#include <functional>
#include <numeric>

#include <bitset>
#include <deque>
#include <map>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <tuple>
#include <vector>

#define TEST                                                                   \
  { IS_TEST = true; }
#define fi first
#define se second
#define pb(x) emplace_back(x)
#define pf(x) emplace_front(x)
#define emp(x) emplace(x)
#define mp(x, y) make_pair(x, y)

using namespace std;
using ll = int_fast64_t;
using v_b = vector<bool>;
using v_ll = vector<ll>;
using str = string;
using v_str = vector<string>;
using p_ll = pair<ll, ll>;
using vv_b = vector<v_b>;
using vv_ll = vector<v_ll>;
using vp_ll = vector<p_ll>;
using vvv_ll = vector<vv_ll>;
using vvp_ll = vector<vp_ll>;
using ld = long double;
using v_ld = vector<ld>;
using vv_ld = vector<v_ld>;

bool IS_TEST = false;
ll ll_min64 = 1LL << 63;
ll ll_max64 = ~ll_min64;
ll ll_min32 = 1LL << 31;
ll ll_max32 = ~ll_min32;

ll MOD = 1000000007;

/*displaying functions for debug*/
template <class T> void show2(const T &x) { cerr << x; }
template <class T1, class T2> void show2(const pair<T1, T2> &x) {
  cerr << "{" << show2(x.first) << "," << show2(x.second) << "}";
}
template <class T> void show(const T &x) {
  if (!IS_TEST)
    return;
  show2(x);
  cerr << "\n";
}
template <class T> void v_show(const T &v, ll n = -1) {
  if (!IS_TEST)
    return;
  auto itr = v.begin();
  ll m = n;
  while (itr != v.end() && m != 0) {
    show2(*itr);
    cerr << " ";
    itr++;
    m--;
  }
  cerr << "\n";
}
template <class T> void vv_show(const T &v, ll n = -1) {
  if (!IS_TEST)
    return;
  cerr << "--------------------------------\n";
  auto itr = v.begin();
  ll m = n;
  while (itr != v.end() && m != 0) {
    v_show(*itr, n);
    itr++;
    m--;
  }
  cerr << "--------------------------------\n";
}
/*--------------------------------*/

/*loading integers*/
void load(ll &x1) { cin >> x1; }
void load(ll &x1, ll &x2) { cin >> x1 >> x2; }
void load(ll &x1, ll &x2, ll &x3) { cin >> x1 >> x2 >> x3; }
void load(ll &x1, ll &x2, ll &x3, ll &x4) { cin >> x1 >> x2 >> x3 >> x4; }
void v_load(ll n, v_ll &v1, ll head = 0, ll tail = 0, ll init = 0) {
  ll m = n + head + tail;
  v1.assign(m, init);
  for (ll i = 0; i < n; i++) {
    scanf("%lld", &v1[i + head]);
  }
}
void v_load(ll n, v_ll &v1, v_ll &v2, ll head = 0, ll tail = 0, ll init = 0) {
  ll m = n + head + tail;
  v1.assign(m, init);
  v2.assign(m, init);
  for (ll i = 0; i < n; i++) {
    scanf("%lld%lld", &v1[i + head], &v2[i + head]);
  }
}
void v_load(ll n, v_ll &v1, v_ll &v2, v_ll &v3, ll head = 0, ll tail = 0,
            ll init = 0) {
  ll m = n + head + tail;
  v1.assign(m, init);
  v2.assign(m, init);
  v3.assign(m, init);
  for (ll i = 0; i < n; i++) {
    scanf("%lld%lld%lld", &v1[i + head], &v2[i + head], &v3[i + head]);
  }
}
void v_load(ll n, v_ll &v1, v_ll &v2, v_ll &v3, v_ll &v4, ll head = 0,
            ll tail = 0, ll init = 0) {
  ll m = n + head + tail;
  v1.assign(m, init);
  v2.assign(m, init);
  v3.assign(m, init);
  v4.assign(m, init);
  for (ll i = 0; i < n; i++) {
    scanf("%lld%lld%lld%lld", &v1[i + head], &v2[i + head], &v3[i + head],
          &v4[i + head]);
  }
}
/*--------------------------------*/

v_ll local_sort(ll x1 = ll_max64, ll x2 = ll_max64, ll x3 = ll_max64,
                ll x4 = ll_max64) {
  v_ll x{x1, x2, x3, x4};
  sort(x.begin(), x.end());
  return x;
}

ll max(ll x, ll y) { return x > y ? x : y; }
ll min(ll x, ll y) { return x < y ? x : y; }

ll max(v_ll::iterator b, v_ll::iterator e) {
  ll ans = *b;
  while (b < e) {
    ans = max(ans, *b);
    b++;
  }
  return ans;
}
ll argmax(v_ll::iterator b, v_ll::iterator e) {
  ll ans = 0, cnt = 0, val = *b;
  while (b < e) {
    if (val < *b) {
      ans = cnt;
      val = *b;
    }
    cnt++;
    b++;
  }
  return ans;
}
ll min(v_ll::iterator b, v_ll::iterator e) {
  ll ans = *b;
  while (b < e) {
    ans = min(ans, *b);
    b++;
  }
  return ans;
}
ll argmin(v_ll::iterator b, v_ll::iterator e) {
  ll ans = 0, cnt = 0, val = *b;
  while (b < e) {
    if (val > *b) {
      ans = cnt;
      val = *b;
    }
    cnt++;
    b++;
  }
  return ans;
}
ll sum(v_ll::iterator b, v_ll::iterator e) {
  ll ans = 0;
  while (b < e) {
    ans += *b;
    b++;
  }
  return ans;
}

template <class T> bool chmax(T &x, const T &y) {
  if (x >= y)
    return false;
  x = y;
  return true;
}
template <class T> bool chmin(T &x, const T &y) {
  if (x <= y)
    return false;
  x = y;
  return true;
}

template <class T> void quit(T x) {
  cout << x << endl;
  exit(0);
}
void yesno(bool x) { cout << (x ? "Yes" : "No") << endl; }

ll rup(ll x, ll y) { return (x - 1) / y + 1; }
ll rem(ll x, ll y) {
  ll z = x % y;
  return z >= 0 ? z : z + y;
}

template <typename T> v_ll index_sort(const vector<T> &ref) {
  v_ll idx(ref.size());
  iota(idx.begin(), idx.end(), 0);
  sort(idx.begin(), idx.end(), [&](auto &x, auto &y) {
    if (ref[x] < ref[y])
      return true;
  });
}

// setprecision(digit)
// sort(##.begin(),##.end(),[&](auto &x, auto &y){if (x<y) return true;});
// ll ok=0,ng=0; while(abs(ok-ng)>1){ll mid=(ok+ng)/2; (true?ok:ng)=mid;}

struct dat {
  ll w, c;
  dat(ll w, ll c) : w(w), c(c) {}
  bool operator<(const dat &rhs) const { return w < rhs.w; }
};

int main() {
  ll H, W;
  v_ll A, B;
  cin >> H >> W;
  v_load(H, A, B);
  for (ll i = 0; i < H; i++) {
    A[i]--;
  }
  set<dat> sd;
  multiset<ll> sl;
  for (ll i = 0; i < W; i++) {
    sd.insert(dat(i, 0));
    sl.insert(0);
  }
  for (ll i = 0; i < H; i++) {
    auto itr = sd.lower_bound(dat(A[i], 0));
    dat d(B[i], 99999999);
    while ((*itr).w <= B[i]) {
      ll dict = (*itr).w + 1;
      chmin(d.c, B[i] - (*itr).w + (*itr).c);
      sl.erase(sl.lower_bound((*itr).c));
      sd.erase(itr);
      itr = sd.lower_bound(dat(dict, 0));
      if (itr == sd.end())
        break;
    }
    if (d.c < 99999999 && B[i] < W) {
      sd.insert(d);
      sl.insert(d.c);
    }
    /*
    auto test=sd.begin();
    cerr << "test " ;
    while (test!=sd.end()){
        cerr << (*test).w <<"," <<(*test).c << " ";
        test++;
    }cerr << endl;
    */

    if (!sl.empty()) {
      ll x = *(sl.begin());
      cout << (x + i + 1) << "\n";
    } else {
      cout << -1 << "\n";
    }
  }
}


Fixed submission:
// #pragma GCC optimize ("O3","unroll-loops")
#include <cassert>
#include <cstdio>
#include <cstdlib>
#include <iomanip>
#include <iostream>

#include <algorithm>
#include <cmath>
#include <functional>
#include <numeric>

#include <bitset>
#include <deque>
#include <map>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <tuple>
#include <vector>

#define TEST                                                                   \
  { IS_TEST = true; }
#define fi first
#define se second
#define pb(x) emplace_back(x)
#define pf(x) emplace_front(x)
#define emp(x) emplace(x)
#define mp(x, y) make_pair(x, y)

using namespace std;
using ll = int_fast64_t;
using v_b = vector<bool>;
using v_ll = vector<ll>;
using str = string;
using v_str = vector<string>;
using p_ll = pair<ll, ll>;
using vv_b = vector<v_b>;
using vv_ll = vector<v_ll>;
using vp_ll = vector<p_ll>;
using vvv_ll = vector<vv_ll>;
using vvp_ll = vector<vp_ll>;
using ld = long double;
using v_ld = vector<ld>;
using vv_ld = vector<v_ld>;

bool IS_TEST = false;
ll ll_min64 = 1LL << 63;
ll ll_max64 = ~ll_min64;
ll ll_min32 = 1LL << 31;
ll ll_max32 = ~ll_min32;

ll MOD = 1000000007;

/*displaying functions for debug*/
template <class T> void show2(const T &x) { cerr << x; }
template <class T1, class T2> void show2(const pair<T1, T2> &x) {
  cerr << "{" << show2(x.first) << "," << show2(x.second) << "}";
}
template <class T> void show(const T &x) {
  if (!IS_TEST)
    return;
  show2(x);
  cerr << "\n";
}
template <class T> void v_show(const T &v, ll n = -1) {
  if (!IS_TEST)
    return;
  auto itr = v.begin();
  ll m = n;
  while (itr != v.end() && m != 0) {
    show2(*itr);
    cerr << " ";
    itr++;
    m--;
  }
  cerr << "\n";
}
template <class T> void vv_show(const T &v, ll n = -1) {
  if (!IS_TEST)
    return;
  cerr << "--------------------------------\n";
  auto itr = v.begin();
  ll m = n;
  while (itr != v.end() && m != 0) {
    v_show(*itr, n);
    itr++;
    m--;
  }
  cerr << "--------------------------------\n";
}
/*--------------------------------*/

/*loading integers*/
void load(ll &x1) { cin >> x1; }
void load(ll &x1, ll &x2) { cin >> x1 >> x2; }
void load(ll &x1, ll &x2, ll &x3) { cin >> x1 >> x2 >> x3; }
void load(ll &x1, ll &x2, ll &x3, ll &x4) { cin >> x1 >> x2 >> x3 >> x4; }
void v_load(ll n, v_ll &v1, ll head = 0, ll tail = 0, ll init = 0) {
  ll m = n + head + tail;
  v1.assign(m, init);
  for (ll i = 0; i < n; i++) {
    scanf("%lld", &v1[i + head]);
  }
}
void v_load(ll n, v_ll &v1, v_ll &v2, ll head = 0, ll tail = 0, ll init = 0) {
  ll m = n + head + tail;
  v1.assign(m, init);
  v2.assign(m, init);
  for (ll i = 0; i < n; i++) {
    scanf("%lld%lld", &v1[i + head], &v2[i + head]);
  }
}
void v_load(ll n, v_ll &v1, v_ll &v2, v_ll &v3, ll head = 0, ll tail = 0,
            ll init = 0) {
  ll m = n + head + tail;
  v1.assign(m, init);
  v2.assign(m, init);
  v3.assign(m, init);
  for (ll i = 0; i < n; i++) {
    scanf("%lld%lld%lld", &v1[i + head], &v2[i + head], &v3[i + head]);
  }
}
void v_load(ll n, v_ll &v1, v_ll &v2, v_ll &v3, v_ll &v4, ll head = 0,
            ll tail = 0, ll init = 0) {
  ll m = n + head + tail;
  v1.assign(m, init);
  v2.assign(m, init);
  v3.assign(m, init);
  v4.assign(m, init);
  for (ll i = 0; i < n; i++) {
    scanf("%lld%lld%lld%lld", &v1[i + head], &v2[i + head], &v3[i + head],
          &v4[i + head]);
  }
}
/*--------------------------------*/

v_ll local_sort(ll x1 = ll_max64, ll x2 = ll_max64, ll x3 = ll_max64,
                ll x4 = ll_max64) {
  v_ll x{x1, x2, x3, x4};
  sort(x.begin(), x.end());
  return x;
}

ll max(ll x, ll y) { return x > y ? x : y; }
ll min(ll x, ll y) { return x < y ? x : y; }

ll max(v_ll::iterator b, v_ll::iterator e) {
  ll ans = *b;
  while (b < e) {
    ans = max(ans, *b);
    b++;
  }
  return ans;
}
ll argmax(v_ll::iterator b, v_ll::iterator e) {
  ll ans = 0, cnt = 0, val = *b;
  while (b < e) {
    if (val < *b) {
      ans = cnt;
      val = *b;
    }
    cnt++;
    b++;
  }
  return ans;
}
ll min(v_ll::iterator b, v_ll::iterator e) {
  ll ans = *b;
  while (b < e) {
    ans = min(ans, *b);
    b++;
  }
  return ans;
}
ll argmin(v_ll::iterator b, v_ll::iterator e) {
  ll ans = 0, cnt = 0, val = *b;
  while (b < e) {
    if (val > *b) {
      ans = cnt;
      val = *b;
    }
    cnt++;
    b++;
  }
  return ans;
}
ll sum(v_ll::iterator b, v_ll::iterator e) {
  ll ans = 0;
  while (b < e) {
    ans += *b;
    b++;
  }
  return ans;
}

template <class T> bool chmax(T &x, const T &y) {
  if (x >= y)
    return false;
  x = y;
  return true;
}
template <class T> bool chmin(T &x, const T &y) {
  if (x <= y)
    return false;
  x = y;
  return true;
}

template <class T> void quit(T x) {
  cout << x << endl;
  exit(0);
}
void yesno(bool x) { cout << (x ? "Yes" : "No") << endl; }

ll rup(ll x, ll y) { return (x - 1) / y + 1; }
ll rem(ll x, ll y) {
  ll z = x % y;
  return z >= 0 ? z : z + y;
}

template <typename T> v_ll index_sort(const vector<T> &ref) {
  v_ll idx(ref.size());
  iota(idx.begin(), idx.end(), 0);
  sort(idx.begin(), idx.end(), [&](auto &x, auto &y) {
    if (ref[x] < ref[y])
      return true;
  });
}

// setprecision(digit)
// sort(##.begin(),##.end(),[&](auto &x, auto &y){if (x<y) return true;});
// ll ok=0,ng=0; while(abs(ok-ng)>1){ll mid=(ok+ng)/2; (true?ok:ng)=mid;}

struct dat {
  ll w, c;
  dat(ll w, ll c) : w(w), c(c) {}
  bool operator<(const dat &rhs) const { return w < rhs.w; }
};

int main() {
  ll H, W;
  v_ll A, B;
  cin >> H >> W;
  v_load(H, A, B);
  for (ll i = 0; i < H; i++) {
    A[i]--;
  }
  set<dat> sd;
  multiset<ll> sl;
  for (ll i = 0; i < W; i++) {
    sd.insert(dat(i, 0));
    sl.insert(0);
  }
  for (ll i = 0; i < H; i++) {
    auto itr = sd.lower_bound(dat(A[i], 0));
    dat d(B[i], 99999999);
    while (itr != sd.end() && (*itr).w <= B[i]) {
      ll dict = (*itr).w + 1;
      chmin(d.c, B[i] - (*itr).w + (*itr).c);
      sl.erase(sl.lower_bound((*itr).c));
      sd.erase(itr);
      itr = sd.lower_bound(dat(dict, 0));
      if (itr == sd.end())
        break;
    }
    if (d.c < 99999999 && B[i] < W) {
      sd.insert(d);
      sl.insert(d.c);
    }
    /*
    auto test=sd.begin();
    cerr << "test " ;
    while (test!=sd.end()){
        cerr << (*test).w <<"," <<(*test).c << " ";
        test++;
    }cerr << endl;
    */

    if (!sl.empty()) {
      ll x = *(sl.begin());
      cout << (x + i + 1) << "\n";
    } else {
      cout << -1 << "\n";
    }
  }
}