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Submission #632225

# Submission time Handle Problem Language Result Execution time Memory
632225 2022-08-19T16:42:35 Z gs14004 Bread First Search (CCO21_day2problem2) C++17
25 / 25
 176 ms 11780 KB 
#include <bits/stdc++.h>
using namespace std;
using lint = long long;
using pi = pair<int, int>;
#define sz(v) ((int)(v).size())
#define all(v) (v).begin(), (v).end()
const int MAXT = 530000;
const int mod = 1e9 + 7;

struct seg{
	int tree[MAXT], lazy[MAXT];
	void lazydown(int p){
		for(int i = 2*p; i < 2*p+2; i++){
			lazy[i] += lazy[p];
			tree[i] += lazy[p];
		}
		lazy[p] = 0;
	}
	void add(int s, int e, int ps, int pe, int p, int v){
		if(e < ps || pe < s) return;
		if(s <= ps && pe <= e){
			tree[p] += v;
			lazy[p] += v;
			return;
		}
		lazydown(p);
		int pm = (ps+pe)/2;
		add(s, e, ps, pm, 2*p, v);
		add(s, e, pm+1, pe, 2*p+1, v);
		tree[p] = min(tree[2*p], tree[2*p+1]);
	}
	int query(int s, int e, int ps, int pe, int p){
		if(e < ps || pe < s) return 1e9;
		if(s <= ps && pe <= e) return tree[p];
		lazydown(p);
		int pm = (ps+pe)/2;
		return min(query(s, e, ps, pm, 2*p), query(s, e, pm+1, pe, 2*p+1));
	}
}seg;

int main(){	
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	int n, m;
	cin >> n >> m;
	vector<int> L(n, 1e9), R(n, -1e9), dp(n + 1), nxt(n, 1e9);
	for(int i = 0; i < m; i++){
		int u, v; cin >> u >> v;
		u--; v--;
		if(u > v) swap(u, v);
		R[u] = max(R[u], v);
		L[v] = min(L[v], u);
	}
	for(int i = 0; i < n; i++){
		nxt[i] = R[i];
		if(i) nxt[i] = max(nxt[i], nxt[i - 1]);
	}
	vector<pi> swp;
	for(int i = 0; i < n; i++) swp.emplace_back(min(i, L[i]), i);
	sort(all(swp)); 
	for(int i = n - 1; i >= 1; i--){
		while(sz(swp) && swp.back().first >= i){
			seg.add(swp.back().second + 1, n, 0, n, 1, 1);
			swp.pop_back();
		}
		dp[i] = seg.query(max(i, nxt[i-1]) + 1, n, 0, n, 1);
		seg.add(i, i, 0, n, 1, dp[i]);
	}
	cout << dp[1] << "\n";
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct

Subtask #2
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 0 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 0 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 0 ms 340 KB Output is correct
21 Correct 1 ms 340 KB Output is correct
22 Correct 1 ms 340 KB Output is correct
23 Correct 2 ms 596 KB Output is correct
24 Correct 2 ms 596 KB Output is correct
25 Correct 5 ms 596 KB Output is correct
26 Correct 5 ms 596 KB Output is correct
27 Correct 5 ms 596 KB Output is correct
28 Correct 4 ms 596 KB Output is correct
29 Correct 3 ms 596 KB Output is correct
30 Correct 8 ms 596 KB Output is correct
31 Correct 8 ms 596 KB Output is correct

Subtask #3
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 0 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 0 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 0 ms 340 KB Output is correct
21 Correct 1 ms 340 KB Output is correct
22 Correct 1 ms 340 KB Output is correct
23 Correct 2 ms 596 KB Output is correct
24 Correct 2 ms 596 KB Output is correct
25 Correct 5 ms 596 KB Output is correct
26 Correct 5 ms 596 KB Output is correct
27 Correct 5 ms 596 KB Output is correct
28 Correct 4 ms 596 KB Output is correct
29 Correct 3 ms 596 KB Output is correct
30 Correct 8 ms 596 KB Output is correct
31 Correct 8 ms 596 KB Output is correct
32 Correct 107 ms 9260 KB Output is correct
33 Correct 124 ms 9308 KB Output is correct
34 Correct 125 ms 10536 KB Output is correct
35 Correct 163 ms 11780 KB Output is correct
36 Correct 176 ms 11752 KB Output is correct
37 Correct 167 ms 11708 KB Output is correct
38 Correct 134 ms 9216 KB Output is correct
39 Correct 106 ms 9268 KB Output is correct
40 Correct 80 ms 5968 KB Output is correct
41 Correct 137 ms 10436 KB Output is correct
42 Correct 172 ms 11592 KB Output is correct
43 Correct 166 ms 11648 KB Output is correct
44 Correct 1 ms 340 KB Output is correct
45 Correct 1 ms 340 KB Output is correct