oj.uz

Submission #99802

# Submission time Handle Problem Language Result Execution time Memory
99802 2019-03-07T12:48:03 Z rdd6584 허수아비 (JOI14_scarecrows) C++14
100 / 100
 227 ms 4600 KB 
#include <cstdio>
#include <memory.h>
#include <cstring>
#include <vector>
#include <deque>
#include <cstdlib>
#include <queue>
#include <algorithm>
#include <cmath>
#include <cassert>
#include <functional>
#include <iostream>
#include <set>
#include <list>
#include <map>
#include <time.h>
#include <unordered_map>
#include <unordered_set>
#include <bitset>
#define sz(x) (int)(x).size()
#define all(x) (x).begin(), (x).end()
using namespace std;

typedef long long ll;
typedef unsigned long long llu;
typedef pair<int, int> pii;
typedef pair<int, pii> piii;
typedef pair<ll, ll> pll;
typedef pair<ll, int> pli;
typedef pair<int, ll> pil;
typedef pair<string, int> psi;
const ll MOD = 1e9 + 7;
const long double PI = 3.141592653589793238462643383279502884197;

priority_queue<int, vector<int>, greater<int> > pq;
vector<int> v;

pii vec[200000];
pii temp[200000];
ll ans = 0;

void go(int le, int ri) {
	int mid = (le + ri) / 2;
	if (le < ri) { go(le, mid); go(mid + 1, ri); }

	int pt, l = le;
	vector<pii> a, b;
	for (int i = mid + 1; i <= ri; i++) {
		while (!b.empty() && b.back().second > vec[i].second) b.pop_back();
		if (b.empty()) pt = -1;
		else pt = b.back().first;
		b.push_back(vec[i]);

		while (l <= mid && vec[l].first < vec[i].first) {
			while (!a.empty() && a.back().second < vec[l].second) a.pop_back();
			a.push_back(vec[l++]);
		}

		int t = upper_bound(all(a), pii(pt, -1)) - a.begin();
		ans += sz(a) - t;
	}

	merge(vec + le, vec + mid + 1, vec + mid + 1, vec + ri + 1, temp);
	memcpy(vec + le, temp, sizeof(pii) * (ri - le + 1));
}

int main() {
	int n;
	scanf("%d", &n);

	for (int i = 0; i < n; i++) {
		scanf("%d %d", &vec[i].first, &vec[i].second);
		swap(vec[i].first, vec[i].second);
	}
	sort(vec, vec + n, [](pii v1, pii v2) { return v1.second < v2.second; });
	go(0, n - 1);

	printf("%lld", ans);
}

Compilation message

scarecrows.cpp: In function 'int main()':
scarecrows.cpp:69:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ~~~~~^~~~~~~~~~
scarecrows.cpp:72:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d", &vec[i].first, &vec[i].second);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 384 KB Output is correct
2 Correct 2 ms 384 KB Output is correct
3 Correct 3 ms 384 KB Output is correct
4 Correct 3 ms 384 KB Output is correct
5 Correct 2 ms 384 KB Output is correct
6 Correct 3 ms 384 KB Output is correct
7 Correct 2 ms 384 KB Output is correct
8 Correct 2 ms 384 KB Output is correct
9 Correct 2 ms 384 KB Output is correct
10 Correct 3 ms 384 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 512 KB Output is correct
2 Correct 7 ms 512 KB Output is correct
3 Correct 6 ms 512 KB Output is correct
4 Correct 6 ms 512 KB Output is correct
5 Correct 8 ms 512 KB Output is correct
6 Correct 6 ms 512 KB Output is correct
7 Correct 6 ms 512 KB Output is correct
8 Correct 6 ms 472 KB Output is correct
9 Correct 6 ms 512 KB Output is correct
10 Correct 8 ms 512 KB Output is correct
11 Correct 7 ms 512 KB Output is correct
12 Correct 6 ms 512 KB Output is correct

Subtask #3
85.0 / 85.0

# Verdict Execution time Memory Grader output
1 Correct 97 ms 4460 KB Output is correct
2 Correct 210 ms 3560 KB Output is correct
3 Correct 152 ms 4600 KB Output is correct
4 Correct 146 ms 4508 KB Output is correct
5 Correct 176 ms 3752 KB Output is correct
6 Correct 171 ms 3576 KB Output is correct
7 Correct 186 ms 3620 KB Output is correct
8 Correct 208 ms 3652 KB Output is correct
9 Correct 119 ms 3596 KB Output is correct
10 Correct 151 ms 3896 KB Output is correct
11 Correct 195 ms 3744 KB Output is correct
12 Correct 203 ms 3576 KB Output is correct
13 Correct 227 ms 3584 KB Output is correct
14 Correct 111 ms 3576 KB Output is correct
15 Correct 181 ms 3576 KB Output is correct
16 Correct 200 ms 3608 KB Output is correct
17 Correct 121 ms 2652 KB Output is correct
18 Correct 211 ms 3676 KB Output is correct
19 Correct 221 ms 3624 KB Output is correct
20 Correct 193 ms 3696 KB Output is correct