Problem p02345 (C++) — buggy submission, verdict: Runtime Error

#include <algorithm>
#include <array>
#include <cstdint>
#include <functional>
#include <iostream>
#include <map>
#include <math.h>
#include <queue>
#include <set>
#include <stack>
#include <stdlib.h>
#include <string>
#include <time.h>
#include <utility>
#include <vector>

#define INF 1000000000
#define MOD 1000000007
#define rep(i, a, b) for (uint32 i = (a); i < (b); ++i)
#define bitget(a, b) (((a) >> (b)) & 1)
#define ALL(x) (x).begin(), (x).end()
#define C(x) std::cout << #x << " : " << x << std::endl
#define scanf scanf_s

using int32 = std::int_fast32_t;
using int64 = std::int_fast64_t;
using uint32 = std::uint_fast32_t;
using uint64 = std::uint_fast64_t;

#include <algorithm>
#include <array>
#include <cstdint>
#include <functional>
#include <iostream>
#include <map>
#include <math.h>
#include <queue>
#include <set>
#include <stack>
#include <stdlib.h>
#include <string>
#include <time.h>
#include <utility>
#include <vector>

#define INF 1000000000
#define MOD 1000000007
#define rep(i, a, b) for (uint32 i = (a); i < (b); ++i)
#define bitget(a, b) (((a) >> (b)) & 1)
#define ALL(x) (x).begin(), (x).end()
#define C(x) std::cout << #x << " : " << x << std::endl
#define scanf scanf_s

using int32 = std::int_fast32_t;
using int64 = std::int_fast64_t;
using uint32 = std::uint_fast32_t;
using uint64 = std::uint_fast64_t;
template <typename Monoid, typename Operand> struct RBnode {
  RBnode *ch[2], *par;
  Monoid value, sum;
  Operand lazy;
  uint32 size, height;
  bool color, reversed; // true=black
};
template <typename Monoid, typename Operand> class RBTrees {
  using Node = RBnode<Monoid, Operand>;

public:
  std::vector<Node> nodes;
  uint32 itr;
  bool balanced;
  Monoid insdata;
  RBTrees(size_t maxsize) {
    nodes.resize(maxsize + 1);
    itr = 0;
    nodes[0].ch[0] = &nodes[0];
    nodes[0].ch[1] = &nodes[0];
    nodes[0].par = nullptr;
    nodes[0].size = 0;
    nodes[0].height = 1;
    nodes[0].color = 1;
  }
  Node *nil(void) { return &nodes[0]; }
  Node *update(Node *node) {
    node->sum = node->value;
    if (node->ch[0] != &nodes[0]) {
      node->sum = node->ch[0]->sum + node->sum;
    }
    if (node->ch[1] != &nodes[0]) {
      node->sum = node->sum + node->ch[1]->sum;
    }
    node->size = node->ch[0]->size + 1 + node->ch[1]->size;
    return node;
  }
  void push(Node *node) {
    node->ch[0]->lazy = node->ch[0]->lazy * node->lazy;
    node->ch[1]->lazy = node->ch[1]->lazy * node->lazy;
    node->value = node->value * node->lazy;
    node->sum = node->sum * node->lazy;
    node->lazy.inactive();
    if (node->reversed) {
      node->ch[0]->reversed ^= 1;
      node->ch[1]->reversed ^= 1;
      std::swap(node->ch[0], node->ch[1]);
      node->sum.reverse();
      node->value.reverse();
      node->reversed = 0;
    }
    return;
  }
  Node *rotate(Node *node, uint32 dir) {
    Node *t = node->ch[dir ^ 1];
    node->ch[dir ^ 1] = t->ch[dir];
    node->height = t->ch[dir]->height;
    t->height = node->height + node->color;
    t->color = node->color;
    node->color = 0;
    t->par = node->par;
    node->par = t;
    t->ch[dir] = update(node);
    return update(t);
  }
  Node *insert(Node *root, const Monoid &value, uint32 position) {
    nodes[++itr].ch[0] = &nodes[0];
    nodes[itr].ch[1] = &nodes[0];
    nodes[itr].value = value;
    nodes[itr].sum = value;
    nodes[itr].lazy.inactive();
    nodes[itr].size = 1;
    nodes[itr].height = 1;
    nodes[itr].color = 0;
    nodes[itr].reversed = 0;
    push(root);
    root = _subins(root, position);
    if (!root->color) {
      root->height += 1;
      root->color = 1;
    }
    return root;
  }
  Node *_subins(Node *node, uint32 pos) {
    if (node == &nodes[0]) {
      balanced = 1;
      return &nodes[itr];
    }
    push(node->ch[0]);
    push(node->ch[1]);
    if (node->ch[0]->size < pos) {
      node->ch[1] = _subins(node->ch[1], pos - node->ch[0]->size - 1);
      node->ch[1]->par = node;
      if (balanced) {
        return _inbal(node, 1);
      }
    } else {
      node->ch[0] = _subins(node->ch[0], pos);
      node->ch[0]->par = node;
      if (balanced) {
        return _inbal(node, 0);
      }
    }
    return update(node);
  }
  Node *flip(Node *node) {
    node->ch[0]->color = 1;
    node->ch[0]->height += 1;
    node->ch[1]->color = 1;
    node->ch[1]->height += 1;
    node->color = 0;
    return node;
  }
  Node *_inbal(Node *node, uint32 dir) {
    if (!node->color) {
      push(node->ch[dir ^ 1]);
      return update(node);
    }
    balanced = 0;
    if (!node->ch[dir ^ 1]->color) {
      if (node->ch[dir]->ch[dir]->color && node->ch[dir]->ch[dir ^ 1]->color) {
        return update(node);
      }
      balanced = 1;
      return flip(update(node));
    }
    if (!node->ch[dir]->ch[dir ^ 1]->color) {
      node->ch[dir] = rotate(node->ch[dir], dir);
    }
    if (node->ch[dir]->ch[dir]->color) {
      return update(node);
    }
    return rotate(node, dir ^ 1);
  }
  Node *access(Node *root, uint32 position) {
    while (1) {
      if (position > root->ch[0]->size) {
        position -= root->ch[0]->size + 1;
        root = root->ch[1];
      } else if (position < root->ch[0]->size) {
        root = root->ch[0];
      } else {
        return root;
      }
    }
  }
  Node *erase(Node *root, uint32 position) {
    push(root);
    if (root->ch[0]->size > position) {
      root->ch[0] = erase(root->ch[0], position);
      if (balanced) {
        return _erbal(update(root), 0);
      }
      return update(root);
    } else if (root->ch[0]->size < position) {
      root->ch[1] = erase(root->ch[1], position - root->ch[0]->size - 1);
      if (balanced) {
        return _erbal(update(root), 1);
      }
      return update(root);
    }
    if (root->ch[0] != &nodes[0]) {
      if (root->ch[1] != &nodes[0]) {
        root->ch[1] = erase(root->ch[1], 0);
        root->value = insdata;
        if (balanced) {
          return _erbal(update(root), 1);
        }
        return update(root);
      }
      root->ch[0]->color = 1;
      ++root->ch[0]->height;
      balanced = 0;
      return root->ch[0];
    } else {
      insdata = root->value;
      if (root->ch[1] != &nodes[0]) {
        root->ch[1]->color = 1;
        ++root->ch[1]->height;
        balanced = 0;
        return root->ch[1];
      }
      balanced = root->color;
      return &nodes[0];
    }
  }
  Node *_erbal(Node *node, uint32 dir) {
    if (node->ch[dir ^ 1]->ch[0]->color && node->ch[dir ^ 1]->ch[1]->color) {
      node->height = node->ch[dir ^ 1]->height + node->color;
      if (node->ch[dir ^ 1]->color) {
        if (node->color) {
          node->ch[dir ^ 1]->color = 0;
          node->ch[dir ^ 1]->height -= 1;
          node->height -= 1;
          return node;
        }
        node->ch[dir ^ 1]->color = 0;
        node->ch[dir ^ 1]->height -= 1;
        node->color = 1;
        balanced = 0;
        return node;
      }
      node = rotate(node, dir);
      node->ch[dir] = _erbal(node->ch[dir], dir);
      node->height = node->ch[dir]->height + node->color;
      return node;
    }
    balanced = 0;
    if (node->ch[dir ^ 1]->ch[dir ^ 1]->color) {
      node->ch[dir ^ 1] = rotate(node->ch[dir ^ 1], dir ^ 1);
    }
    node = rotate(node, dir);
    ++node->height;
    ++node->ch[0]->height;
    node->ch[0]->color = 1;
    ++node->ch[1]->height;
    node->ch[1]->color = 1;
    return node;
  }
  Monoid range(Node *root, uint32 begin, uint32 end) {
    Node *t = root;
    Monoid ret;
    while (1) {
      if (t->ch[0]->size < begin) {
        begin -= t->ch[0]->size + 1;
        end -= t->ch[0]->size + 1;
        t = t->ch[1];
        continue;
      }
      if (t->ch[0]->size < end) {
        end -= t->ch[0]->size + 1;
        ret = t->value;
        root = t->ch[0];
        t = t->ch[1];
        break;
      }
      t = t->ch[0];
    }
    while (root != &nodes[0]) {
      if (root->ch[0]->size < begin) {
        begin -= root->ch[0]->size + 1;
        root = root->ch[1];
        continue;
      }
      if (root->ch[1] != &nodes[0])
        ret = (root->value + root->ch[1]->sum) + ret;
      else
        ret = root->value + ret;
      root = root->ch[0];
    }
    while (t != &nodes[0]) {
      if (t->ch[0]->size < end) {
        end -= t->ch[0]->size + 1;
        if (t->ch[0] != &nodes[0])
          ret = ret + (t->ch[0]->sum + t->value);
        else
          ret = ret + t->value;
        t = t->ch[1];
        continue;
      }
      t = t->ch[0];
    }
    return ret;
  }
  void show(Node *node) {
    std::cout << "(";
    if (node->ch[0] != &nodes[0]) {
      show(node->ch[0]);
      std::cout << "←";
    }
    std::cout << node->value.e << " " << node->color << " " << node->height;
    if (node->ch[1] != &nodes[0]) {
      std::cout << "→";
      show(node->ch[1]);
    }
    std::cout << ")";
    return;
  }
  void check(Node *node) {
    if (node->ch[0] != &nodes[0]) {
      if (node->ch[0]->par != node)
        std::cerr << "#\\n";
      check(node->ch[0]);
    }
    if (node->ch[1] != &nodes[0]) {
      if (node->ch[1]->par != node)
        std::cerr << "#\\n";
      check(node->ch[1]);
    }
  }
};
struct SUB {
  int32 e;
  bool a;
  SUB() { set(); }
  SUB(int32 x, bool y) {
    e = x;
    a = y;
  }
  void set() { a = false; }
  void inactive(void) { a = false; }
  SUB operator*(const SUB &other) {
    if (other.a)
      return other;
    return *this;
  }
};
struct MIN {
  int32 e;
  MIN() { set(); }
  MIN(int32 x) { e = x; }
  void set() { e = 2147483647; }
  void reverse(void) {}
  MIN operator+(const MIN &other) {
    if (e < other.e)
      return *this;
    return other;
  };
  MIN operator*(const SUB &other) {
    if (other.a)
      return MIN(other.e);
    return *this;
  }
};
int main(void) {
  std::ios::sync_with_stdio(false);
  std::cin.tie(0);
  uint32 n, q;
  std::cin >> n >> q;
  RBTrees<MIN, SUB> T(n + q);
  RBnode<MIN, SUB> *r = T.nil();
  int64 com, y;
  uint32 x;
  rep(i, 0, n) { r = T.insert(r, MIN(2147483647), 0); }
  // T.show(r);std::cout << "\\n";
  rep(i, 0, q) {
    std::cin >> com >> x >> y;
    if (com == 0) {
      r = T.erase(r, x);
      // T.show(r);std::cout << "\\n";
      r = T.insert(r, MIN(y), x);
      // T.show(r);std::cout << "\\n";
    } else {
      std::cout << T.range(r, x, y + 1).e << "\\n";
    }
    // T.check(r);
  }
  return 0;
}


Error: 0

Fixed submission:

#include <algorithm>
#include <array>
#include <cstdint>
#include <functional>
#include <iostream>
#include <map>
#include <math.h>
#include <queue>
#include <set>
#include <stack>
#include <stdlib.h>
#include <string>
#include <time.h>
#include <utility>
#include <vector>

#define INF 1000000000
#define MOD 1000000007
#define rep(i, a, b) for (uint32 i = (a); i < (b); ++i)
#define bitget(a, b) (((a) >> (b)) & 1)
#define ALL(x) (x).begin(), (x).end()
#define C(x) std::cout << #x << " : " << x << std::endl
#define scanf scanf_s

using int32 = std::int_fast32_t;
using int64 = std::int_fast64_t;
using uint32 = std::uint_fast32_t;
using uint64 = std::uint_fast64_t;
template <typename Monoid, typename Operand> struct RBnode {
  RBnode *ch[2], *par;
  Monoid value, sum;
  Operand lazy;
  uint32 size, height;
  bool color, reversed; // true=black
};
template <typename Monoid, typename Operand> class RBTrees {
  using Node = RBnode<Monoid, Operand>;

public:
  std::vector<Node> nodes;
  uint32 itr;
  bool balanced;
  Monoid insdata;
  RBTrees(size_t maxsize) {
    nodes.resize(maxsize + 1);
    itr = 0;
    nodes[0].ch[0] = &nodes[0];
    nodes[0].ch[1] = &nodes[0];
    nodes[0].par = nullptr;
    nodes[0].size = 0;
    nodes[0].height = 1;
    nodes[0].color = 1;
  }
  Node *nil(void) { return &nodes[0]; }
  Node *create(Monoid &value) {
    nodes[++itr].ch[0] = &nodes[0];
    nodes[itr].ch[1] = &nodes[0];
    nodes[itr].par = nullptr;
    nodes[itr].value = value;
    nodes[itr].sum = value;
    nodes[itr].lazy.inactive();
    nodes[itr].size = 1;
    nodes[itr].height = 2;
    nodes[itr].color = 1;
    nodes[itr].reversed = 0;
    return &nodes[itr];
  }
  Node *update(Node *node) {
    node->sum = node->value;
    node->height = node->color + 1;
    if (node->ch[0] != &nodes[0]) {
      push(node->ch[0]);
      node->sum = node->ch[0]->sum + node->sum;
      node->height = node->ch[0]->height + node->color;
    }
    if (node->ch[1] != &nodes[0]) {
      push(node->ch[1]);
      node->sum = node->sum + node->ch[1]->sum;
      node->height = node->ch[1]->height + node->color;
    }
    node->size = node->ch[0]->size + 1 + node->ch[1]->size;
    node->ch[0]->par = node;
    node->ch[1]->par = node;
    return node;
  }
  Node *push(Node *node) {
    node->ch[0]->lazy = node->ch[0]->lazy * node->lazy;
    node->ch[1]->lazy = node->ch[1]->lazy * node->lazy;
    node->value = node->value * node->lazy;
    node->sum = node->sum * node->lazy;
    node->lazy.inactive();
    if (node->reversed) {
      node->ch[0]->reversed ^= 1;
      node->ch[1]->reversed ^= 1;
      std::swap(node->ch[0], node->ch[1]);
      node->sum.reverse();
      node->value.reverse();
      node->reversed = 0;
    }
    return node;
  }
  Node *rotate(Node *node, uint32 dir) {
    Node *t = node->ch[dir ^ 1];
    node->ch[dir ^ 1] = t->ch[dir];
    t->color = node->color;
    node->color = 0;
    t->ch[dir] = update(node);
    t->par = nullptr;
    return update(t);
  }
  Node *insert(Node *root, const Monoid &value, uint32 position) {
    insdata = value;
    root = _subins(root, position);
    if (!root->color) {
      root->height += 1;
      root->color = 1;
    }
    return root;
  }
  Node *_subins(Node *node, uint32 pos) {
    if (node == &nodes[0]) {
      create(insdata);
      nodes[itr].color = 0;
      nodes[itr].height = 1;
      balanced = 1;
      return &nodes[itr];
    }
    push(node);
    if (node->ch[0]->size < pos) {
      node->ch[1] = _subins(node->ch[1], pos - node->ch[0]->size - 1);
      if (balanced) {
        return _inbal(update(node), 1);
      }
    } else {
      node->ch[0] = _subins(node->ch[0], pos);
      if (balanced) {
        return _inbal(update(node), 0);
      }
    }
    return update(node);
  }
  Node *flip(Node *node) {
    node->ch[0]->color = 1;
    node->ch[0]->height += 1;
    node->ch[1]->color = 1;
    node->ch[1]->height += 1;
    node->color = 0;
    return node;
  }
  Node *_inbal(Node *node, uint32 dir) {
    if (!node->color) {
      return node;
    }
    if (!node->ch[dir]->ch[dir ^ 1]->color) {
      node->ch[dir] = rotate(node->ch[dir], dir);
    }
    if (node->ch[dir]->ch[dir]->color) {
      balanced = 0;
      return node;
    }
    if (node->ch[dir ^ 1]->color) {
      balanced = 0;
      return rotate(node, dir ^ 1);
    }
    return flip(node);
  }
  Node *access(Node *root, uint32 position) {
    while (1) {
      if (position > root->ch[0]->size) {
        position -= root->ch[0]->size + 1;
        root = root->ch[1];
      } else if (position < root->ch[0]->size) {
        root = root->ch[0];
      } else {
        return root;
      }
    }
  }
  Node *erase(Node *root, uint32 position) {
    push(root);
    if (root->ch[0]->size > position) {
      root->ch[0] = erase(root->ch[0], position);
      if (balanced) {
        return _erbal(update(root), 0);
      }
      return update(root);
    } else if (root->ch[0]->size < position) {
      root->ch[1] = erase(root->ch[1], position - root->ch[0]->size - 1);
      if (balanced) {
        return _erbal(update(root), 1);
      }
      return update(root);
    }
    if (root->ch[0] != &nodes[0]) {
      if (root->ch[1] != &nodes[0]) {
        root->ch[1] = erase(root->ch[1], 0);
        root->value = insdata;
        if (balanced) {
          return _erbal(update(root), 1);
        }
        return update(root);
      }
      root->ch[0]->color = 1;
      ++root->ch[0]->height;
      balanced = 0;
      return root->ch[0];
    } else {
      insdata = root->value;
      if (root->ch[1] != &nodes[0]) {
        root->ch[1]->color = 1;
        ++root->ch[1]->height;
        balanced = 0;
        return root->ch[1];
      }
      balanced = root->color;
      return &nodes[0];
    }
  }
  Node *_erbal(Node *node, uint32 dir) {
    if (node->ch[dir ^ 1]->ch[0]->color && node->ch[dir ^ 1]->ch[1]->color) {
      node->height = node->ch[dir ^ 1]->height + node->color;
      if (node->ch[dir ^ 1]->color) {
        if (node->color) {
          node->ch[dir ^ 1]->color = 0;
          node->ch[dir ^ 1]->height -= 1;
          node->height -= 1;
          return node;
        }
        node->ch[dir ^ 1]->color = 0;
        node->ch[dir ^ 1]->height -= 1;
        node->color = 1;
        balanced = 0;
        return node;
      }
      node = rotate(node, dir);
      node->ch[dir] = _erbal(node->ch[dir], dir);
      node->height = node->ch[dir]->height + node->color;
      return node;
    }
    balanced = 0;
    if (node->ch[dir ^ 1]->ch[dir ^ 1]->color) {
      node->ch[dir ^ 1] = rotate(node->ch[dir ^ 1], dir ^ 1);
    }
    node = rotate(node, dir);
    ++node->height;
    ++node->ch[0]->height;
    node->ch[0]->color = 1;
    ++node->ch[1]->height;
    node->ch[1]->color = 1;
    return node;
  }
  Monoid range(Node *root, uint32 begin, uint32 end) {
    Node *t = root;
    Monoid ret;
    while (1) {
      if (t->ch[0]->size < begin) {
        begin -= t->ch[0]->size + 1;
        end -= t->ch[0]->size + 1;
        t = t->ch[1];
        continue;
      }
      if (t->ch[0]->size < end) {
        end -= t->ch[0]->size + 1;
        ret = t->value;
        root = t->ch[0];
        t = t->ch[1];
        break;
      }
      t = t->ch[0];
    }
    while (root != &nodes[0]) {
      if (root->ch[0]->size < begin) {
        begin -= root->ch[0]->size + 1;
        root = root->ch[1];
        continue;
      }
      if (root->ch[1] != &nodes[0])
        ret = (root->value + root->ch[1]->sum) + ret;
      else
        ret = root->value + ret;
      root = root->ch[0];
    }
    while (t != &nodes[0]) {
      if (t->ch[0]->size < end) {
        end -= t->ch[0]->size + 1;
        if (t->ch[0] != &nodes[0])
          ret = ret + (t->ch[0]->sum + t->value);
        else
          ret = ret + t->value;
        t = t->ch[1];
        continue;
      }
      t = t->ch[0];
    }
    return ret;
  }
  void show(Node *node) {
    std::cout << "(";
    if (node->ch[0] != &nodes[0]) {
      show(node->ch[0]);
      std::cout << "←";
    }
    std::cout << node->value.e << " " << node->color << " " << node->height;
    if (node->ch[1] != &nodes[0]) {
      std::cout << "→";
      show(node->ch[1]);
    }
    std::cout << ")";
    return;
  }
  void check(Node *node) {
    if (node->ch[0] != &nodes[0]) {
      if (node->ch[0]->par != node)
        std::cerr << "#\\n";
      check(node->ch[0]);
    }
    if (node->ch[1] != &nodes[0]) {
      if (node->ch[1]->par != node)
        std::cerr << "#\\n";
      check(node->ch[1]);
    }
  }
};
struct SUB {
  int32 e;
  bool a;
  SUB() { set(); }
  SUB(int32 x, bool y) {
    e = x;
    a = y;
  }
  void set() { a = false; }
  void inactive(void) { a = false; }
  SUB operator*(const SUB &other) {
    if (other.a)
      return other;
    return *this;
  }
};
struct MIN {
  int32 e;
  MIN() { set(); }
  MIN(int32 x) { e = x; }
  void set() { e = 2147483647; }
  void reverse(void) {}
  MIN operator+(const MIN &other) {
    if (e < other.e)
      return *this;
    return other;
  };
  MIN operator*(const SUB &other) {
    if (other.a)
      return MIN(other.e);
    return *this;
  }
};
int main(void) {
  std::ios::sync_with_stdio(false);
  std::cin.tie(0);
  uint32 n, q;
  std::cin >> n >> q;
  RBTrees<MIN, SUB> T(n + q);
  RBnode<MIN, SUB> *r = T.nil();
  int64 com, y;
  uint32 x;
  rep(i, 0, n) { r = T.insert(r, MIN(0x7FFFFFFF), 0); }
  // T.show(r);
  // std::cout << "\\n";
  rep(i, 0, q) {
    std::cin >> com >> x >> y;
    if (com == 0) {
      r = T.erase(r, x);
      // T.show(r);
      // std::cout << "\\n";
      r = T.insert(r, MIN(y), x);
      // T.show(r);
      // std::cout << "\\n";
    } else {
      std::cout << T.range(r, x, y + 1).e << "\\n";
    }
    T.check(r);
  }
  return 0;
}