oj.uz

답안 #156057

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
156057 2019-10-03T04:10:25 Z IOrtroiii 허수아비 (JOI14_scarecrows) C++14
100 / 100
 484 ms 12872 KB 
#include <bits/stdc++.h>

using namespace std;

using ll = long long;

int main() {
   int n;
   scanf("%d", &n);
   vector<int> x(n);
   vector<int> y(n);
   {
      vector<pair<int, int>> ps;
      for (int i = 0; i < n; ++i) {
         int x, y;
         scanf("%d %d", &x, &y);
         ps.emplace_back(x, y);
      }
      sort(ps.begin(), ps.end());
      for (int i = 0; i < n; ++i) {
         x[i] = ps[i].first;
         y[i] = ps[i].second;
      }
   }
   ll ans = 0;
   function<void(int, int)> solve = [&](int l, int r) {
      if (l == r) {
         return;
      }
      int md = (l + r) >> 1;
      vector<tuple<int, int, int>> vals;
      for (int i = l; i <= md; ++i) {
         vals.emplace_back(y[i], x[i], -1);
      }
      for (int i = md + 1; i <= r; ++i) {
         vals.emplace_back(y[i], x[i], +1);
      }
      sort(vals.begin(), vals.end());
      vector<pair<int, int>> st1, st2;
      auto Assert = [&](vector<pair<int, int>> ps) {
         int sz = ps.size();
         for (int i = 1; i < sz; ++i) {
            assert(ps[i].first > ps[i - 1].first);
            assert(ps[i].second < ps[i - 1].second);
         }
      };
      for (auto v : vals) {
         int y, x, tp;
         tie(y, x, tp) = v;
         if (tp == -1) {
            while (st1.size() && x > st1.back().second) {
               st1.pop_back();
            }
            st1.emplace_back(y, x);
         } else {
            while (st2.size() && x < st2.back().second) {
               st2.pop_back();
            }
            int lim;
            if (st2.empty()) lim = -1;
            else lim = st2.back().first;
            int fs = upper_bound(st1.begin(), st1.end(), make_pair(lim, 0)) - st1.begin();
            ans += (st1.size()) - fs;
            st2.emplace_back(y, x);
         }
         // Assert(st1);
         // Assert(st2);
      }
      solve(l, md);
      solve(md + 1, r);
   };
   solve(0, n - 1);
   printf("%lld\n", ans);
}

Compilation message

scarecrows.cpp: In lambda function:
scarecrows.cpp:40:12: warning: variable 'Assert' set but not used [-Wunused-but-set-variable]
       auto Assert = [&](vector<pair<int, int>> ps) {
            ^~~~~~
scarecrows.cpp: In function 'int main()':
scarecrows.cpp:9:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d", &n);
    ~~~~~^~~~~~~~~~
scarecrows.cpp:16:15: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
          scanf("%d %d", &x, &y);
          ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 236 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 2 ms 376 KB Output is correct
10 Correct 2 ms 376 KB Output is correct

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 504 KB Output is correct
2 Correct 11 ms 504 KB Output is correct
3 Correct 10 ms 708 KB Output is correct
4 Correct 7 ms 632 KB Output is correct
5 Correct 10 ms 636 KB Output is correct
6 Correct 11 ms 632 KB Output is correct
7 Correct 11 ms 632 KB Output is correct
8 Correct 8 ms 632 KB Output is correct
9 Correct 10 ms 604 KB Output is correct
10 Correct 10 ms 632 KB Output is correct
11 Correct 11 ms 632 KB Output is correct
12 Correct 8 ms 632 KB Output is correct

Subtask #3
85.0 / 85.0

# 결과 실행 시간 메모리 Grader output
1 Correct 261 ms 8972 KB Output is correct
2 Correct 482 ms 8004 KB Output is correct
3 Correct 390 ms 12872 KB Output is correct
4 Correct 262 ms 12812 KB Output is correct
5 Correct 412 ms 12016 KB Output is correct
6 Correct 446 ms 11920 KB Output is correct
7 Correct 464 ms 11824 KB Output is correct
8 Correct 479 ms 11844 KB Output is correct
9 Correct 259 ms 12748 KB Output is correct
10 Correct 425 ms 11844 KB Output is correct
11 Correct 455 ms 11924 KB Output is correct
12 Correct 471 ms 11888 KB Output is correct
13 Correct 484 ms 11888 KB Output is correct
14 Correct 265 ms 12740 KB Output is correct
15 Correct 454 ms 11844 KB Output is correct
16 Correct 482 ms 11972 KB Output is correct
17 Correct 278 ms 7552 KB Output is correct
18 Correct 475 ms 11976 KB Output is correct
19 Correct 470 ms 11844 KB Output is correct
20 Correct 467 ms 11916 KB Output is correct