oj.uz

Submission #202016

# Submission time Handle Problem Language Result Execution time Memory
202016 2020-02-13T04:55:46 Z manh9203 허수아비 (JOI14_scarecrows) C++17
100 / 100
 1810 ms 33732 KB 
#include<bits/stdc++.h>
using namespace std;
#define x first
#define y second
const int N = 2e5 + 5;
typedef pair<int, int> point;
long long n, m, LBoard[N], RBoard[N], fen[N], ans;
point p[N];
vector<int> dmx, s, que[N], upd[N];
map<int, int> idx;
//BIT
void update(int id, int val){
	for(int i = id; i <= m; i += (i&-i)){
		fen[i] += val;
	}
}
int get(int id){
	int sum = 0;
	for(int i = id; i >= 1; i -= (i&-i)){
		sum += fen[i];
	}
	return sum;
}
//DnC
bool cmp1(point a, point b){
	return a.y < b.y;
}
bool cmp2(point a, point b){
	return a.x < b.x;
}
void solve(int l, int r){
	if(l == r) return;
	int mid = (l + r) >> 1;
	dmx.clear(); idx.clear();
	for(int i = l; i <= r; i++){
		dmx.push_back(p[i].x);
	}
	sort(dmx.begin(), dmx.end());
	auto it = unique(dmx.begin(), dmx.end());
	dmx.resize(distance(dmx.begin(), it));
	m = dmx.size();
	for(int i = 0; i < m; i++){
		idx[dmx[i]] = i + 1;
		que[i + 1].clear(); upd[i + 1].clear();
		fen[i + 1] = 0;
	}
	sort(p + l, p + mid + 1, cmp2);
	sort(p + mid + 1, p + r + 1, cmp2);
	s.clear(); s.push_back(0);
	idx[-1] = m + 1;
	for(int i = mid; i >= l; i--){
		while(s.size() > 1 && p[i].y > p[s.back()].y){
			s.pop_back();
		}
		upd[idx[p[s.back()].x]].push_back(idx[p[i].x]);
		s.push_back(i);
		update(idx[p[i].x], 1);
	}
	s.clear(); s.push_back(0);
	idx[-1] = 0;
	for(int i = mid + 1; i <= r; i++){
		while(s.size() > 1 && p[i].y < p[s.back()].y){
			s.pop_back();
		}
		que[idx[p[i].x]].push_back(idx[p[s.back()].x]);
		s.push_back(i);
	}
	for(int i = 1; i <= m; i++){
		for(int j: upd[i]){
			update(j, -1);
		}
		for(int j: que[i]){
			ans += get(i) - get(j);
		}
	}
	sort(p + l, p + r + 1, cmp1);
	solve(l, mid);
	solve(mid + 1, r);
}
//main
int main(){
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	cin >> n;
	for(int i = 1; i <= n; i++){
		cin >> p[i].x >> p[i].y;
	}
	p[0] = {-1, -1};
	sort(p + 1, p + 1 + n, cmp1);
	solve(1, n);
	cout << ans;
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 9720 KB Output is correct
2 Correct 12 ms 9720 KB Output is correct
3 Correct 12 ms 9848 KB Output is correct
4 Correct 12 ms 9752 KB Output is correct
5 Correct 12 ms 9720 KB Output is correct
6 Correct 12 ms 9720 KB Output is correct
7 Correct 12 ms 9720 KB Output is correct
8 Correct 12 ms 9720 KB Output is correct
9 Correct 12 ms 9720 KB Output is correct
10 Correct 12 ms 9720 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 29 ms 10232 KB Output is correct
2 Correct 37 ms 10360 KB Output is correct
3 Correct 33 ms 10360 KB Output is correct
4 Correct 30 ms 10488 KB Output is correct
5 Correct 35 ms 10360 KB Output is correct
6 Correct 38 ms 10364 KB Output is correct
7 Correct 37 ms 10360 KB Output is correct
8 Correct 29 ms 10292 KB Output is correct
9 Correct 34 ms 10232 KB Output is correct
10 Correct 37 ms 10360 KB Output is correct
11 Correct 38 ms 10488 KB Output is correct
12 Correct 29 ms 10232 KB Output is correct

Subtask #3
85.0 / 85.0

# Verdict Execution time Memory Grader output
1 Correct 1316 ms 29168 KB Output is correct
2 Correct 1783 ms 31672 KB Output is correct
3 Correct 1551 ms 32112 KB Output is correct
4 Correct 1270 ms 33732 KB Output is correct
5 Correct 1616 ms 32752 KB Output is correct
6 Correct 1696 ms 31980 KB Output is correct
7 Correct 1779 ms 31852 KB Output is correct
8 Correct 1779 ms 31856 KB Output is correct
9 Correct 1285 ms 30576 KB Output is correct
10 Correct 1530 ms 31088 KB Output is correct
11 Correct 1645 ms 31596 KB Output is correct
12 Correct 1737 ms 31732 KB Output is correct
13 Correct 1810 ms 31728 KB Output is correct
14 Correct 1295 ms 30572 KB Output is correct
15 Correct 1646 ms 31596 KB Output is correct
16 Correct 1794 ms 31752 KB Output is correct
17 Correct 1043 ms 24304 KB Output is correct
18 Correct 1779 ms 31728 KB Output is correct
19 Correct 1769 ms 31728 KB Output is correct
20 Correct 1777 ms 31596 KB Output is correct