oj.uz

답안 #1067322

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1067322 2024-08-20T14:46:12 Z juicy 허수아비 (JOI14_scarecrows) C++17
100 / 100
 926 ms 16868 KB 
#include <bits/stdc++.h>

using namespace std;

#ifdef LOCAL
#include "debug.h"
#else
#define debug(...) 42
#endif

const int N = 2e5 + 5;

int n;
long long res;
int ft[N], p[N];

void upd(int i, int x) {
  for (; i <= n; i += i & -i) {
    ft[i] += x;
  }
}

int qry(int i) {
  int res = 0;
  for (; i; i -= i & -i) {
    res += ft[i];
  }
  return res;
}

int qry(int l, int r) {
  return qry(r) - qry(l - 1);
}

void add(int x) {
  if (x > 0) {
    upd(x, 1);
  } else {
    upd(-x, -1);
  }
}

void dc(int L, int R) {
  if (L == R) {
    return;
  }
  int md = (L + R) / 2;
  dc(L, md); dc(md + 1, R);
  set<int> st;
  vector<array<int, 2>> queries, events;
  for (int i = md + 1; i <= R; ++i) {
    auto it = st.upper_bound(p[i]);
    int j = it != st.begin() ? *prev(it) + 1 : 1;
    queries.push_back({p[i], j});
    st.insert(p[i]);
  }
  set<int>().swap(st);
  for (int i = md; i >= L; --i) {
    auto it = st.lower_bound(p[i]);
    int j = it != st.end() ? *it : n + 1;
    events.push_back({p[i], p[i]});
    events.push_back({j, -p[i]});
    st.insert(p[i]);
  }
  set<int>().swap(st);
  sort(queries.begin(), queries.end());
  sort(events.begin(), events.end());
  int j = 0;
  for (auto [r, l] : queries) {
    while (j < events.size() && events[j][0] <= r) {
      add(events[j++][1]);
    }
    res += qry(l, r);
  }
  while (j < events.size()) {
    add(events[j++][1]);
  }
}

int main() {
  ios::sync_with_stdio(false); cin.tie(nullptr);

  cin >> n;
  vector<array<int, 2>> pt(n);
  vector<int> comp;
  for (int i = 0; i < n; ++i) {
    cin >> pt[i][0] >> pt[i][1];
    comp.push_back(pt[i][1]);
  }
  sort(pt.begin(), pt.end());
  sort(comp.begin(), comp.end());
  comp.erase(unique(comp.begin(), comp.end()), comp.end());
  for (int i = 0; i < n; ++i) {
    p[i] = lower_bound(comp.begin(), comp.end(), pt[i][1]) - comp.begin() + 1;
  }
  dc(0, n - 1);
  cout << res;
  return 0;
}

Compilation message

scarecrows.cpp: In function 'void dc(int, int)':
scarecrows.cpp:70:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::array<int, 2> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   70 |     while (j < events.size() && events[j][0] <= r) {
      |            ~~^~~~~~~~~~~~~~~
scarecrows.cpp:75:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::array<int, 2> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   75 |   while (j < events.size()) {
      |          ~~^~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 1 ms 344 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 828 KB Output is correct
2 Correct 13 ms 860 KB Output is correct
3 Correct 11 ms 776 KB Output is correct
4 Correct 7 ms 856 KB Output is correct
5 Correct 12 ms 856 KB Output is correct
6 Correct 12 ms 860 KB Output is correct
7 Correct 13 ms 856 KB Output is correct
8 Correct 8 ms 872 KB Output is correct
9 Correct 12 ms 860 KB Output is correct
10 Correct 12 ms 860 KB Output is correct
11 Correct 13 ms 744 KB Output is correct
12 Correct 9 ms 740 KB Output is correct

Subtask #3
85.0 / 85.0

# 결과 실행 시간 메모리 Grader output
1 Correct 515 ms 13848 KB Output is correct
2 Correct 918 ms 16796 KB Output is correct
3 Correct 686 ms 15056 KB Output is correct
4 Correct 479 ms 15056 KB Output is correct
5 Correct 730 ms 15272 KB Output is correct
6 Correct 807 ms 15092 KB Output is correct
7 Correct 879 ms 16512 KB Output is correct
8 Correct 926 ms 16732 KB Output is correct
9 Correct 526 ms 15168 KB Output is correct
10 Correct 755 ms 15284 KB Output is correct
11 Correct 852 ms 15072 KB Output is correct
12 Correct 873 ms 16348 KB Output is correct
13 Correct 915 ms 16868 KB Output is correct
14 Correct 530 ms 15192 KB Output is correct
15 Correct 821 ms 16212 KB Output is correct
16 Correct 923 ms 16604 KB Output is correct
17 Correct 528 ms 9984 KB Output is correct
18 Correct 875 ms 15392 KB Output is correct
19 Correct 856 ms 15276 KB Output is correct
20 Correct 868 ms 15064 KB Output is correct