oj.uz

Submission #257642

# Submission time Handle Problem Language Result Execution time Memory
257642 2020-08-04T13:56:43 Z arnold518 Joker (BOI20_joker) C++14
14 / 100
 2000 ms 27636 KB 
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int MAXN = 4e5;
const int SQ = 200;

struct Query
{
	int l, r, k;
	bool operator < (const Query &p) { return r>p.r; }
};

int N, M, Q;
pii E[MAXN+10];
Query A[MAXN+10];
vector<Query> B[MAXN+10];
int ans[MAXN+10];

struct UF
{
	//int par[MAXN+10], sz[MAXN+10], opp[MAXN+10];
	vector<int> par, sz, opp;
	bool state;
	vector<int> V;
	void init()
	{
		par.resize(2*N+10); sz.resize(2*N+10); opp.resize(2*N+10);
		int i, j;
		for(i=1; i<=N; i++) par[i]=i, sz[i]=1, opp[i]=N+i;
		for(i=1; i<=N; i++) par[i+N]=i+N, sz[i+N]=1, opp[i+N]=i;
		V.clear(); state=true;
	}
	int Find(int x)
	{
		if(x==par[x]) return x;
		return Find(par[x]);
	}
	void Union(int x, int y)
	{
		//printf("Union %d %d\n", x, y);

		x=Find(x); y=Find(y);
		int nx=opp[x], ny=opp[y];

		if(x==y || !state)
		{
			if(state) V.push_back(-1);
			else V.push_back(-2);
			state=false;
			return;
		}

		if(sz[x]<sz[ny]) swap(x, ny);
		if(sz[y]<sz[nx]) swap(y, nx);
		V.push_back(opp[x]); V.push_back(opp[y]); V.push_back(ny); V.push_back(nx);
		par[ny]=x; sz[x]+=sz[ny];
		par[nx]=y; sz[y]+=sz[nx];
		opp[x]=y; opp[y]=x;
	}
	void restore()
	{
		int ny, nx, x, y, oppx, oppy;
		//printf("RESTORE\n");
		if(V.empty()) while(1);
		if(V.back()<0)
		{
			if(V.back()==-1) state=true;
			V.pop_back();
		 	return;
		}
		nx=V.back(); V.pop_back();
		ny=V.back(); V.pop_back();
		oppy=V.back(); V.pop_back();
		oppx=V.back(); V.pop_back();
		x=par[ny]; y=par[nx];
		opp[x]=oppx; opp[y]=oppy;
		sz[x]-=sz[ny]; sz[y]-=sz[nx];
		par[ny]=ny; par[nx]=nx;
	}
}uf;


int main()
{
	int i, j, k;

	scanf("%d%d%d", &N, &M, &Q);
	for(i=1; i<=M; i++) scanf("%d%d", &E[i].first, &E[i].second);
	for(i=1; i<=Q; i++)
	{
		scanf("%d%d", &A[i].l, &A[i].r);
		A[i].k=i;
		B[A[i].l/SQ].push_back(A[i]);
	}

	uf.init();
	for(i=0, j=1; i<=M/SQ; i++)
	{
		int l=max(SQ*i, 1), r=min(SQ*i+SQ-1, M);
		sort(B[i].begin(), B[i].end());

		for(; j<l; j++) uf.Union(E[j].first, E[j].second);
		int p=M, q;
		for(auto it : B[i])
		{
			for(; p>it.r; p--) uf.Union(E[p].first, E[p].second);
			for(q=l; q<it.l; q++) uf.Union(E[q].first, E[q].second);
			ans[it.k]=uf.state;
			for(q=l; q<it.l; q++) uf.restore();
		}
		for(p++; p<=M; p++) uf.restore();
	}
	for(i=1; i<=Q; i++)
	{
		if(!ans[i]) printf("YES\n");
		else printf("NO\n");
	}
}

Compilation message

Joker.cpp: In member function 'void UF::init()':
Joker.cpp:32:10: warning: unused variable 'j' [-Wunused-variable]
   int i, j;
          ^
Joker.cpp: In function 'int main()':
Joker.cpp:103:23: warning: unused variable 'r' [-Wunused-variable]
   int l=max(SQ*i, 1), r=min(SQ*i+SQ-1, M);
                       ^
Joker.cpp:89:12: warning: unused variable 'k' [-Wunused-variable]
  int i, j, k;
            ^
Joker.cpp:91:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%d", &N, &M, &Q);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~
Joker.cpp:92:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(i=1; i<=M; i++) scanf("%d%d", &E[i].first, &E[i].second);
                      ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Joker.cpp:95:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &A[i].l, &A[i].r);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 9728 KB Output is correct
2 Correct 5 ms 9728 KB Output is correct
3 Correct 5 ms 9728 KB Output is correct
4 Correct 6 ms 9728 KB Output is correct
5 Correct 6 ms 9728 KB Output is correct
6 Correct 5 ms 9728 KB Output is correct
7 Correct 6 ms 9728 KB Output is correct
8 Correct 7 ms 9728 KB Output is correct
9 Correct 6 ms 9728 KB Output is correct
10 Correct 6 ms 9736 KB Output is correct
11 Correct 7 ms 9728 KB Output is correct
12 Correct 6 ms 9728 KB Output is correct
13 Correct 6 ms 9728 KB Output is correct
14 Correct 6 ms 9728 KB Output is correct
15 Correct 6 ms 9728 KB Output is correct
16 Correct 6 ms 9728 KB Output is correct
17 Correct 7 ms 9728 KB Output is correct
18 Correct 6 ms 9728 KB Output is correct
19 Correct 9 ms 9728 KB Output is correct
20 Correct 10 ms 9728 KB Output is correct
21 Correct 8 ms 9728 KB Output is correct
22 Correct 9 ms 9728 KB Output is correct
23 Correct 7 ms 9728 KB Output is correct
24 Correct 7 ms 9728 KB Output is correct
25 Correct 8 ms 9728 KB Output is correct
26 Correct 7 ms 9728 KB Output is correct
27 Correct 7 ms 9728 KB Output is correct
28 Correct 7 ms 9728 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 9728 KB Output is correct
2 Correct 5 ms 9728 KB Output is correct
3 Correct 5 ms 9728 KB Output is correct
4 Correct 6 ms 9728 KB Output is correct
5 Correct 6 ms 9728 KB Output is correct
6 Correct 5 ms 9728 KB Output is correct
7 Correct 6 ms 9728 KB Output is correct
8 Correct 7 ms 9728 KB Output is correct
9 Correct 6 ms 9728 KB Output is correct
10 Correct 6 ms 9736 KB Output is correct
11 Correct 7 ms 9728 KB Output is correct
12 Correct 6 ms 9728 KB Output is correct
13 Correct 6 ms 9728 KB Output is correct
14 Correct 6 ms 9728 KB Output is correct
15 Correct 6 ms 9728 KB Output is correct
16 Correct 6 ms 9728 KB Output is correct
17 Correct 7 ms 9728 KB Output is correct
18 Correct 6 ms 9728 KB Output is correct
19 Correct 9 ms 9728 KB Output is correct
20 Correct 10 ms 9728 KB Output is correct
21 Correct 8 ms 9728 KB Output is correct
22 Correct 9 ms 9728 KB Output is correct
23 Correct 7 ms 9728 KB Output is correct
24 Correct 7 ms 9728 KB Output is correct
25 Correct 8 ms 9728 KB Output is correct
26 Correct 7 ms 9728 KB Output is correct
27 Correct 7 ms 9728 KB Output is correct
28 Correct 7 ms 9728 KB Output is correct
29 Correct 15 ms 9856 KB Output is correct
30 Correct 13 ms 9856 KB Output is correct
31 Correct 12 ms 9856 KB Output is correct
32 Correct 12 ms 9856 KB Output is correct
33 Correct 11 ms 9856 KB Output is correct
34 Correct 11 ms 9856 KB Output is correct
35 Correct 16 ms 9856 KB Output is correct
36 Correct 11 ms 9856 KB Output is correct
37 Correct 14 ms 9984 KB Output is correct
38 Correct 16 ms 9984 KB Output is correct
39 Correct 30 ms 9984 KB Output is correct
40 Correct 19 ms 9856 KB Output is correct
41 Correct 20 ms 9960 KB Output is correct
42 Correct 20 ms 9856 KB Output is correct
43 Correct 59 ms 9856 KB Output is correct
44 Correct 49 ms 9856 KB Output is correct
45 Correct 10 ms 9856 KB Output is correct
46 Correct 13 ms 9856 KB Output is correct
47 Correct 69 ms 9936 KB Output is correct
48 Correct 20 ms 9856 KB Output is correct
49 Correct 14 ms 9856 KB Output is correct
50 Correct 14 ms 9984 KB Output is correct
51 Correct 55 ms 9908 KB Output is correct
52 Correct 52 ms 9976 KB Output is correct
53 Correct 31 ms 9856 KB Output is correct
54 Correct 14 ms 9856 KB Output is correct

Subtask #3
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 9728 KB Output is correct
2 Correct 5 ms 9728 KB Output is correct
3 Correct 142 ms 23780 KB Output is correct
4 Correct 160 ms 27636 KB Output is correct
5 Correct 163 ms 27108 KB Output is correct
6 Correct 146 ms 23780 KB Output is correct
7 Correct 151 ms 23784 KB Output is correct
8 Execution timed out 2077 ms 21984 KB Time limit exceeded
9 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 9728 KB Output is correct
2 Correct 5 ms 9728 KB Output is correct
3 Correct 5 ms 9728 KB Output is correct
4 Correct 6 ms 9728 KB Output is correct
5 Correct 6 ms 9728 KB Output is correct
6 Correct 5 ms 9728 KB Output is correct
7 Correct 6 ms 9728 KB Output is correct
8 Correct 7 ms 9728 KB Output is correct
9 Correct 6 ms 9728 KB Output is correct
10 Correct 6 ms 9736 KB Output is correct
11 Correct 7 ms 9728 KB Output is correct
12 Correct 6 ms 9728 KB Output is correct
13 Correct 6 ms 9728 KB Output is correct
14 Correct 6 ms 9728 KB Output is correct
15 Correct 6 ms 9728 KB Output is correct
16 Correct 6 ms 9728 KB Output is correct
17 Correct 7 ms 9728 KB Output is correct
18 Correct 6 ms 9728 KB Output is correct
19 Correct 9 ms 9728 KB Output is correct
20 Correct 10 ms 9728 KB Output is correct
21 Correct 8 ms 9728 KB Output is correct
22 Correct 9 ms 9728 KB Output is correct
23 Correct 7 ms 9728 KB Output is correct
24 Correct 7 ms 9728 KB Output is correct
25 Correct 8 ms 9728 KB Output is correct
26 Correct 7 ms 9728 KB Output is correct
27 Correct 7 ms 9728 KB Output is correct
28 Correct 7 ms 9728 KB Output is correct
29 Correct 142 ms 23780 KB Output is correct
30 Correct 160 ms 27636 KB Output is correct
31 Correct 163 ms 27108 KB Output is correct
32 Correct 146 ms 23780 KB Output is correct
33 Correct 151 ms 23784 KB Output is correct
34 Execution timed out 2077 ms 21984 KB Time limit exceeded
35 Halted 0 ms 0 KB -

Subtask #5
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 9728 KB Output is correct
2 Correct 5 ms 9728 KB Output is correct
3 Correct 5 ms 9728 KB Output is correct
4 Correct 6 ms 9728 KB Output is correct
5 Correct 6 ms 9728 KB Output is correct
6 Correct 5 ms 9728 KB Output is correct
7 Correct 6 ms 9728 KB Output is correct
8 Correct 7 ms 9728 KB Output is correct
9 Correct 6 ms 9728 KB Output is correct
10 Correct 6 ms 9736 KB Output is correct
11 Correct 7 ms 9728 KB Output is correct
12 Correct 6 ms 9728 KB Output is correct
13 Correct 6 ms 9728 KB Output is correct
14 Correct 6 ms 9728 KB Output is correct
15 Correct 6 ms 9728 KB Output is correct
16 Correct 6 ms 9728 KB Output is correct
17 Correct 7 ms 9728 KB Output is correct
18 Correct 6 ms 9728 KB Output is correct
19 Correct 9 ms 9728 KB Output is correct
20 Correct 10 ms 9728 KB Output is correct
21 Correct 8 ms 9728 KB Output is correct
22 Correct 9 ms 9728 KB Output is correct
23 Correct 7 ms 9728 KB Output is correct
24 Correct 7 ms 9728 KB Output is correct
25 Correct 8 ms 9728 KB Output is correct
26 Correct 7 ms 9728 KB Output is correct
27 Correct 7 ms 9728 KB Output is correct
28 Correct 7 ms 9728 KB Output is correct
29 Correct 15 ms 9856 KB Output is correct
30 Correct 13 ms 9856 KB Output is correct
31 Correct 12 ms 9856 KB Output is correct
32 Correct 12 ms 9856 KB Output is correct
33 Correct 11 ms 9856 KB Output is correct
34 Correct 11 ms 9856 KB Output is correct
35 Correct 16 ms 9856 KB Output is correct
36 Correct 11 ms 9856 KB Output is correct
37 Correct 14 ms 9984 KB Output is correct
38 Correct 16 ms 9984 KB Output is correct
39 Correct 30 ms 9984 KB Output is correct
40 Correct 19 ms 9856 KB Output is correct
41 Correct 20 ms 9960 KB Output is correct
42 Correct 20 ms 9856 KB Output is correct
43 Correct 59 ms 9856 KB Output is correct
44 Correct 49 ms 9856 KB Output is correct
45 Correct 10 ms 9856 KB Output is correct
46 Correct 13 ms 9856 KB Output is correct
47 Correct 69 ms 9936 KB Output is correct
48 Correct 20 ms 9856 KB Output is correct
49 Correct 14 ms 9856 KB Output is correct
50 Correct 14 ms 9984 KB Output is correct
51 Correct 55 ms 9908 KB Output is correct
52 Correct 52 ms 9976 KB Output is correct
53 Correct 31 ms 9856 KB Output is correct
54 Correct 14 ms 9856 KB Output is correct
55 Correct 1643 ms 15992 KB Output is correct
56 Execution timed out 2096 ms 22760 KB Time limit exceeded
57 Halted 0 ms 0 KB -

Subtask #6
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 9728 KB Output is correct
2 Correct 5 ms 9728 KB Output is correct
3 Correct 5 ms 9728 KB Output is correct
4 Correct 6 ms 9728 KB Output is correct
5 Correct 6 ms 9728 KB Output is correct
6 Correct 5 ms 9728 KB Output is correct
7 Correct 6 ms 9728 KB Output is correct
8 Correct 7 ms 9728 KB Output is correct
9 Correct 6 ms 9728 KB Output is correct
10 Correct 6 ms 9736 KB Output is correct
11 Correct 7 ms 9728 KB Output is correct
12 Correct 6 ms 9728 KB Output is correct
13 Correct 6 ms 9728 KB Output is correct
14 Correct 6 ms 9728 KB Output is correct
15 Correct 6 ms 9728 KB Output is correct
16 Correct 6 ms 9728 KB Output is correct
17 Correct 7 ms 9728 KB Output is correct
18 Correct 6 ms 9728 KB Output is correct
19 Correct 9 ms 9728 KB Output is correct
20 Correct 10 ms 9728 KB Output is correct
21 Correct 8 ms 9728 KB Output is correct
22 Correct 9 ms 9728 KB Output is correct
23 Correct 7 ms 9728 KB Output is correct
24 Correct 7 ms 9728 KB Output is correct
25 Correct 8 ms 9728 KB Output is correct
26 Correct 7 ms 9728 KB Output is correct
27 Correct 7 ms 9728 KB Output is correct
28 Correct 7 ms 9728 KB Output is correct
29 Correct 15 ms 9856 KB Output is correct
30 Correct 13 ms 9856 KB Output is correct
31 Correct 12 ms 9856 KB Output is correct
32 Correct 12 ms 9856 KB Output is correct
33 Correct 11 ms 9856 KB Output is correct
34 Correct 11 ms 9856 KB Output is correct
35 Correct 16 ms 9856 KB Output is correct
36 Correct 11 ms 9856 KB Output is correct
37 Correct 14 ms 9984 KB Output is correct
38 Correct 16 ms 9984 KB Output is correct
39 Correct 30 ms 9984 KB Output is correct
40 Correct 19 ms 9856 KB Output is correct
41 Correct 20 ms 9960 KB Output is correct
42 Correct 20 ms 9856 KB Output is correct
43 Correct 59 ms 9856 KB Output is correct
44 Correct 49 ms 9856 KB Output is correct
45 Correct 10 ms 9856 KB Output is correct
46 Correct 13 ms 9856 KB Output is correct
47 Correct 69 ms 9936 KB Output is correct
48 Correct 20 ms 9856 KB Output is correct
49 Correct 14 ms 9856 KB Output is correct
50 Correct 14 ms 9984 KB Output is correct
51 Correct 55 ms 9908 KB Output is correct
52 Correct 52 ms 9976 KB Output is correct
53 Correct 31 ms 9856 KB Output is correct
54 Correct 14 ms 9856 KB Output is correct
55 Correct 142 ms 23780 KB Output is correct
56 Correct 160 ms 27636 KB Output is correct
57 Correct 163 ms 27108 KB Output is correct
58 Correct 146 ms 23780 KB Output is correct
59 Correct 151 ms 23784 KB Output is correct
60 Execution timed out 2077 ms 21984 KB Time limit exceeded
61 Halted 0 ms 0 KB -