Submission #572265

#	Time	Username	Problem	Language	Result	Execution time	Memory
572265		SSRS	Weighting stones (IZhO11_stones)	C++14	100 / 100	223 ms	4444 KiB

stones

#include <bits/stdc++.h>
using namespace std;
const int INF = 1000000;
struct lazy_segment_tree{
  int N;
  vector<int> mn, mx, lazy;
  lazy_segment_tree(int N2){
    N = 1;
    while (N < N2){
      N *= 2;
    }
    mn = vector<int>(N * 2 - 1, INF);
    mx = vector<int>(N * 2 - 1, -INF);
    for (int i = 0; i < N2; i++){
      mn[N - 1 + i] = 0;
      mx[N - 1 + i] = 0;
    }
    for (int i = N - 2; i >= 0; i--){
      mn[i] = min(mn[i * 2 + 1], mn[i * 2 + 2]);
      mx[i] = max(mx[i * 2 + 1], mx[i * 2 + 2]);
    }
    lazy = vector<int>(N * 2 - 1, 0);
  }
  void eval(int i){
    if (i < N - 1){
      lazy[i * 2 + 1] += lazy[i];
      lazy[i * 2 + 2] += lazy[i];
    }
    mn[i] += lazy[i];
    mx[i] += lazy[i];
    lazy[i] = 0;
  }
  void range_add(int L, int R, int x, int i, int l, int r){
    eval(i);
    if (r <= L || R <= l){
      return;
    } else if (L <= l && r <= R){
      lazy[i] += x;
      eval(i);
    } else {
      int m = (l + r) / 2;
      range_add(L, R, x, i * 2 + 1, l, m);
      range_add(L, R, x, i * 2 + 2, m, r);
      mn[i] = min(mn[i * 2 + 1], mn[i * 2 + 2]);
      mx[i] = max(mx[i * 2 + 1], mx[i * 2 + 2]);
    }
  }
  void range_add(int L, int R, int x){
    range_add(L, R, x, 0, 0, N);
  }
  int range_min(int L, int R, int i, int l, int r){
    eval(i);
    if (r <= L || R <= l){
      return INF;
    } else if (L <= l && r <= R){
      return mn[i];
    } else {
      int m = (l + r) / 2;
      return min(range_min(L, R, i * 2 + 1, l, m), range_min(L, R, i * 2 + 2, m, r));
    }
  }
  int range_min(int L, int R){
    return range_min(L, R, 0, 0, N);
  }
  int range_max(int L, int R, int i, int l, int r){
    eval(i);
    if (r <= L || R <= l){
      return -INF;
    } else if (L <= l && r <= r){
      return mx[i];
    } else {
      int m = (l + r) / 2;
      return max(range_max(L, R, i * 2 + 1, l, m), range_max(L, R, i * 2 + 2, m, r));
    }
  }
  int range_max(int L, int R){
    return range_max(L, R, 0, 0, N);
  }
};
int main(){
  int N;
  cin >> N;
  lazy_segment_tree ST(N);
  for (int i = 0; i < N; i++){
    int R, S;
    cin >> R >> S;
    if (S == 1){
      ST.range_add(0, R, 1);
    }
    if (S == 2){
      ST.range_add(0, R, -1);
    }
    if (ST.range_max(0, N) <= 0){
      cout << '<' << endl;
    } else if (ST.range_min(0, N) >= 0){
      cout << '>' << endl;
    } else {
      cout << '?' << endl;
    }
  }
}

Compilation message (stderr)

stones.cpp: In member function 'int lazy_segment_tree::range_max(int, int, int, int, int)':
stones.cpp:69:28: warning: self-comparison always evaluates to true [-Wtautological-compare]
   69 |     } else if (L <= l && r <= r){
      |                          ~ ^~ ~

• Subtask 1: 100 / 100