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Submission #1054303

# Submission time Handle Problem Language Result Execution time Memory
1054303 2024-08-12T08:32:59 Z allin27x Joker (BOI20_joker) C++17
14 / 100
 2000 ms 21440 KB 
#include <bits/stdc++.h>
using namespace std;
#define int long long 
const int mod = 1e9+7;
#define forn(i,n) for(int i=0; i<n; i++)
#define readv(a,n) vector<int>a(n);forn(i,n)cin>>a[i];
#define readvv(a,n,m) vector<vector<int>> a(n,vector<int>(m));forn(i,n)forn(j,m)cin>>a[i][j];
#define all(a) a.begin(), a.end()
#define _max(x,y) x = max(x,y)
#define _min(x,y) x = min(x,y)
// #define f first
// #define s second

const int N = 2e5+4;
const int SQRT = 460;
int ans[N];

struct qr{
	int l, r, i;
	bool operator<(qr b){
		return make_pair(l/SQRT, r) < make_pair(b.l/SQRT,b.r);
	}
};

vector<qr> queries[SQRT];
int edges[N][2];

struct DSU{
	vector<int> par;
	vector<int> size;
	stack<int> rb;
	int cmp;
	DSU(int n){
		par.resize(n); for(int i=0; i<n; ++i) par[i]=i;
		size.resize(n,1); cmp = n;
	}
	int get(int p){
		return par[p]==p? p: get(par[p]);
	}
	void unite(int a, int b){
		a = get(a); b = get(b);
		if (a==b){
			rb.push(-1);
			return;
		}
		cmp--;
		if (size[a] > size[b]) swap(a,b);
		rb.push(a);
		size[b]+=size[a];
		par[a] = b;
	}
	int conn(int a, int b){
		return get(a) == get(b);
	}
	void rollback(){
		int f = rb.top();
		rb.pop();
		if (f==-1) return;
		cmp++;
		size[par[f]] -= size[f];
		par[f] = f;
	}
};


void solve(){
	int n,m,q; cin>>n>>m>>q;
	for (int i=0; i<m; i++){
		int a,b; cin>>a>>b; a--;b--; edges[i][0]=a; edges[i][1] = b;
	}
	for (int i=0; i<q; i++){
		int l,r; cin>>l>>r; l--; r--;
		qr p; p.l=l;p.r=r;p.i=i;
		queries[l/SQRT].push_back(p);
	}
	for (int i=0; i<SQRT; i++) sort(queries[i].begin(), queries[i].end());
	DSU dsu(2*n);
	int fM =0; 
	for (int t=0; t<SQRT; t++){
		int fm = 0;
		int i = m-1; int j = queries[t].size()-1;
		while (i>=0){
			if (j<0){
				dsu.unite(edges[i][0] + n, edges[i][1]);
				dsu.unite(edges[i][0], edges[i][1] + n);
				i--;
				continue;
			}
			qr p = queries[t][j];
			while (p.r == i){
				if (j<0) break;
				int f = 0;
				for (int ll=t*SQRT; ll<p.l; ll++){
					if (dsu.conn(edges[ll][0],edges[ll][1])) f++;
					dsu.unite(edges[ll][0]+n, edges[ll][1]);
					dsu.unite(edges[ll][0], edges[ll][1]+n);
				}
				for (int ll=t*SQRT; ll<p.l; ll++){
					dsu.rollback(); dsu.rollback();
				}
				if (f || fm || fM) ans[p.i] = 1;
				j--;
				if (j<0) break;
				p = queries[t][j];
			}
			fm += dsu.conn(edges[i][0], edges[i][1]);
			dsu.unite(edges[i][0] + n, edges[i][1]);
			dsu.unite(edges[i][0], edges[i][1] + n);
			i--;
		}
		for (int ll=0; ll<2*m; ll++) dsu.rollback();
		for (int ll=SQRT*t; ll<min(m, SQRT*t + SQRT); ll++){
			fM += dsu.conn(edges[ll][0], edges[ll][1]);
			dsu.unite(edges[ll][0] + n, edges[ll][1]);
			dsu.unite(edges[ll][0], edges[ll][1] + n);
		}
	}
	for (int i=0;i<q; i++) cout<<(ans[i]?"YES\n":"NO\n");
}


signed main(){ 
	ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
	int t=1;
	while(t--){
		solve();
	}	
	return 0;
}

Subtask #1
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 0 ms 2396 KB Output is correct
3 Correct 0 ms 2396 KB Output is correct
4 Correct 0 ms 2396 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 0 ms 2396 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 1 ms 2396 KB Output is correct
9 Correct 2 ms 2396 KB Output is correct
10 Correct 1 ms 2396 KB Output is correct
11 Correct 1 ms 2396 KB Output is correct
12 Correct 1 ms 2396 KB Output is correct
13 Correct 1 ms 2396 KB Output is correct
14 Correct 1 ms 2396 KB Output is correct
15 Correct 1 ms 2396 KB Output is correct
16 Correct 2 ms 2396 KB Output is correct
17 Correct 2 ms 2536 KB Output is correct
18 Correct 1 ms 2396 KB Output is correct
19 Correct 1 ms 2396 KB Output is correct
20 Correct 2 ms 2396 KB Output is correct
21 Correct 2 ms 2396 KB Output is correct
22 Correct 2 ms 2532 KB Output is correct
23 Correct 3 ms 2396 KB Output is correct
24 Correct 1 ms 2396 KB Output is correct
25 Correct 1 ms 2396 KB Output is correct
26 Correct 1 ms 2396 KB Output is correct
27 Correct 2 ms 2396 KB Output is correct
28 Correct 1 ms 2396 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 0 ms 2396 KB Output is correct
3 Correct 0 ms 2396 KB Output is correct
4 Correct 0 ms 2396 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 0 ms 2396 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 1 ms 2396 KB Output is correct
9 Correct 2 ms 2396 KB Output is correct
10 Correct 1 ms 2396 KB Output is correct
11 Correct 1 ms 2396 KB Output is correct
12 Correct 1 ms 2396 KB Output is correct
13 Correct 1 ms 2396 KB Output is correct
14 Correct 1 ms 2396 KB Output is correct
15 Correct 1 ms 2396 KB Output is correct
16 Correct 2 ms 2396 KB Output is correct
17 Correct 2 ms 2536 KB Output is correct
18 Correct 1 ms 2396 KB Output is correct
19 Correct 1 ms 2396 KB Output is correct
20 Correct 2 ms 2396 KB Output is correct
21 Correct 2 ms 2396 KB Output is correct
22 Correct 2 ms 2532 KB Output is correct
23 Correct 3 ms 2396 KB Output is correct
24 Correct 1 ms 2396 KB Output is correct
25 Correct 1 ms 2396 KB Output is correct
26 Correct 1 ms 2396 KB Output is correct
27 Correct 2 ms 2396 KB Output is correct
28 Correct 1 ms 2396 KB Output is correct
29 Correct 11 ms 2652 KB Output is correct
30 Correct 16 ms 2708 KB Output is correct
31 Correct 18 ms 2728 KB Output is correct
32 Correct 16 ms 2652 KB Output is correct
33 Correct 16 ms 2696 KB Output is correct
34 Correct 18 ms 2648 KB Output is correct
35 Correct 18 ms 2648 KB Output is correct
36 Correct 27 ms 2648 KB Output is correct
37 Correct 21 ms 2704 KB Output is correct
38 Correct 14 ms 2652 KB Output is correct
39 Correct 29 ms 2736 KB Output is correct
40 Correct 34 ms 2652 KB Output is correct
41 Correct 18 ms 2652 KB Output is correct
42 Correct 17 ms 2652 KB Output is correct
43 Correct 34 ms 2668 KB Output is correct
44 Correct 17 ms 2712 KB Output is correct
45 Correct 18 ms 2648 KB Output is correct
46 Correct 17 ms 2740 KB Output is correct
47 Correct 15 ms 2648 KB Output is correct
48 Correct 15 ms 2720 KB Output is correct
49 Correct 17 ms 2652 KB Output is correct
50 Correct 15 ms 2716 KB Output is correct
51 Correct 18 ms 2652 KB Output is correct
52 Correct 18 ms 2712 KB Output is correct
53 Correct 22 ms 2724 KB Output is correct
54 Correct 19 ms 2716 KB Output is correct

Subtask #3
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 0 ms 2396 KB Output is correct
3 Correct 1587 ms 21440 KB Output is correct
4 Execution timed out 2054 ms 21432 KB Time limit exceeded
5 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 0 ms 2396 KB Output is correct
3 Correct 0 ms 2396 KB Output is correct
4 Correct 0 ms 2396 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 0 ms 2396 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 1 ms 2396 KB Output is correct
9 Correct 2 ms 2396 KB Output is correct
10 Correct 1 ms 2396 KB Output is correct
11 Correct 1 ms 2396 KB Output is correct
12 Correct 1 ms 2396 KB Output is correct
13 Correct 1 ms 2396 KB Output is correct
14 Correct 1 ms 2396 KB Output is correct
15 Correct 1 ms 2396 KB Output is correct
16 Correct 2 ms 2396 KB Output is correct
17 Correct 2 ms 2536 KB Output is correct
18 Correct 1 ms 2396 KB Output is correct
19 Correct 1 ms 2396 KB Output is correct
20 Correct 2 ms 2396 KB Output is correct
21 Correct 2 ms 2396 KB Output is correct
22 Correct 2 ms 2532 KB Output is correct
23 Correct 3 ms 2396 KB Output is correct
24 Correct 1 ms 2396 KB Output is correct
25 Correct 1 ms 2396 KB Output is correct
26 Correct 1 ms 2396 KB Output is correct
27 Correct 2 ms 2396 KB Output is correct
28 Correct 1 ms 2396 KB Output is correct
29 Correct 1587 ms 21440 KB Output is correct
30 Execution timed out 2054 ms 21432 KB Time limit exceeded
31 Halted 0 ms 0 KB -

Subtask #5
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 0 ms 2396 KB Output is correct
3 Correct 0 ms 2396 KB Output is correct
4 Correct 0 ms 2396 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 0 ms 2396 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 1 ms 2396 KB Output is correct
9 Correct 2 ms 2396 KB Output is correct
10 Correct 1 ms 2396 KB Output is correct
11 Correct 1 ms 2396 KB Output is correct
12 Correct 1 ms 2396 KB Output is correct
13 Correct 1 ms 2396 KB Output is correct
14 Correct 1 ms 2396 KB Output is correct
15 Correct 1 ms 2396 KB Output is correct
16 Correct 2 ms 2396 KB Output is correct
17 Correct 2 ms 2536 KB Output is correct
18 Correct 1 ms 2396 KB Output is correct
19 Correct 1 ms 2396 KB Output is correct
20 Correct 2 ms 2396 KB Output is correct
21 Correct 2 ms 2396 KB Output is correct
22 Correct 2 ms 2532 KB Output is correct
23 Correct 3 ms 2396 KB Output is correct
24 Correct 1 ms 2396 KB Output is correct
25 Correct 1 ms 2396 KB Output is correct
26 Correct 1 ms 2396 KB Output is correct
27 Correct 2 ms 2396 KB Output is correct
28 Correct 1 ms 2396 KB Output is correct
29 Correct 11 ms 2652 KB Output is correct
30 Correct 16 ms 2708 KB Output is correct
31 Correct 18 ms 2728 KB Output is correct
32 Correct 16 ms 2652 KB Output is correct
33 Correct 16 ms 2696 KB Output is correct
34 Correct 18 ms 2648 KB Output is correct
35 Correct 18 ms 2648 KB Output is correct
36 Correct 27 ms 2648 KB Output is correct
37 Correct 21 ms 2704 KB Output is correct
38 Correct 14 ms 2652 KB Output is correct
39 Correct 29 ms 2736 KB Output is correct
40 Correct 34 ms 2652 KB Output is correct
41 Correct 18 ms 2652 KB Output is correct
42 Correct 17 ms 2652 KB Output is correct
43 Correct 34 ms 2668 KB Output is correct
44 Correct 17 ms 2712 KB Output is correct
45 Correct 18 ms 2648 KB Output is correct
46 Correct 17 ms 2740 KB Output is correct
47 Correct 15 ms 2648 KB Output is correct
48 Correct 15 ms 2720 KB Output is correct
49 Correct 17 ms 2652 KB Output is correct
50 Correct 15 ms 2716 KB Output is correct
51 Correct 18 ms 2652 KB Output is correct
52 Correct 18 ms 2712 KB Output is correct
53 Correct 22 ms 2724 KB Output is correct
54 Correct 19 ms 2716 KB Output is correct
55 Correct 1671 ms 14316 KB Output is correct
56 Execution timed out 2087 ms 19672 KB Time limit exceeded
57 Halted 0 ms 0 KB -

Subtask #6
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 0 ms 2396 KB Output is correct
3 Correct 0 ms 2396 KB Output is correct
4 Correct 0 ms 2396 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 0 ms 2396 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 1 ms 2396 KB Output is correct
9 Correct 2 ms 2396 KB Output is correct
10 Correct 1 ms 2396 KB Output is correct
11 Correct 1 ms 2396 KB Output is correct
12 Correct 1 ms 2396 KB Output is correct
13 Correct 1 ms 2396 KB Output is correct
14 Correct 1 ms 2396 KB Output is correct
15 Correct 1 ms 2396 KB Output is correct
16 Correct 2 ms 2396 KB Output is correct
17 Correct 2 ms 2536 KB Output is correct
18 Correct 1 ms 2396 KB Output is correct
19 Correct 1 ms 2396 KB Output is correct
20 Correct 2 ms 2396 KB Output is correct
21 Correct 2 ms 2396 KB Output is correct
22 Correct 2 ms 2532 KB Output is correct
23 Correct 3 ms 2396 KB Output is correct
24 Correct 1 ms 2396 KB Output is correct
25 Correct 1 ms 2396 KB Output is correct
26 Correct 1 ms 2396 KB Output is correct
27 Correct 2 ms 2396 KB Output is correct
28 Correct 1 ms 2396 KB Output is correct
29 Correct 11 ms 2652 KB Output is correct
30 Correct 16 ms 2708 KB Output is correct
31 Correct 18 ms 2728 KB Output is correct
32 Correct 16 ms 2652 KB Output is correct
33 Correct 16 ms 2696 KB Output is correct
34 Correct 18 ms 2648 KB Output is correct
35 Correct 18 ms 2648 KB Output is correct
36 Correct 27 ms 2648 KB Output is correct
37 Correct 21 ms 2704 KB Output is correct
38 Correct 14 ms 2652 KB Output is correct
39 Correct 29 ms 2736 KB Output is correct
40 Correct 34 ms 2652 KB Output is correct
41 Correct 18 ms 2652 KB Output is correct
42 Correct 17 ms 2652 KB Output is correct
43 Correct 34 ms 2668 KB Output is correct
44 Correct 17 ms 2712 KB Output is correct
45 Correct 18 ms 2648 KB Output is correct
46 Correct 17 ms 2740 KB Output is correct
47 Correct 15 ms 2648 KB Output is correct
48 Correct 15 ms 2720 KB Output is correct
49 Correct 17 ms 2652 KB Output is correct
50 Correct 15 ms 2716 KB Output is correct
51 Correct 18 ms 2652 KB Output is correct
52 Correct 18 ms 2712 KB Output is correct
53 Correct 22 ms 2724 KB Output is correct
54 Correct 19 ms 2716 KB Output is correct
55 Correct 1587 ms 21440 KB Output is correct
56 Execution timed out 2054 ms 21432 KB Time limit exceeded
57 Halted 0 ms 0 KB -