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Submission #257635

# Submission time Handle Problem Language Result Execution time Memory
257635 2020-08-04T13:48:11 Z arnold518 Joker (BOI20_joker) C++14
25 / 100
 199 ms 262148 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 par[x]=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
0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 9728 KB Output is correct
2 Correct 9 ms 9728 KB Output is correct
3 Correct 6 ms 9728 KB Output is correct
4 Correct 9 ms 9728 KB Output is correct
5 Correct 9 ms 9728 KB Output is correct
6 Correct 6 ms 9728 KB Output is correct
7 Runtime error 190 ms 262148 KB Execution killed with signal 9 (could be triggered by violating memory limits)
8 Halted 0 ms 0 KB -

Subtask #2
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 9728 KB Output is correct
2 Correct 9 ms 9728 KB Output is correct
3 Correct 6 ms 9728 KB Output is correct
4 Correct 9 ms 9728 KB Output is correct
5 Correct 9 ms 9728 KB Output is correct
6 Correct 6 ms 9728 KB Output is correct
7 Runtime error 190 ms 262148 KB Execution killed with signal 9 (could be triggered by violating memory limits)
8 Halted 0 ms 0 KB -

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 9728 KB Output is correct
2 Correct 9 ms 9728 KB Output is correct
3 Correct 158 ms 23772 KB Output is correct
4 Correct 189 ms 27620 KB Output is correct
5 Correct 157 ms 27108 KB Output is correct
6 Correct 149 ms 23904 KB Output is correct
7 Correct 152 ms 23776 KB Output is correct
8 Correct 148 ms 23008 KB Output is correct
9 Correct 157 ms 23908 KB Output is correct
10 Correct 167 ms 26340 KB Output is correct
11 Correct 155 ms 23780 KB Output is correct
12 Correct 167 ms 25704 KB Output is correct
13 Correct 147 ms 21860 KB Output is correct
14 Correct 165 ms 22836 KB Output is correct
15 Correct 199 ms 24712 KB Output is correct
16 Correct 180 ms 26208 KB Output is correct

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 9728 KB Output is correct
2 Correct 9 ms 9728 KB Output is correct
3 Correct 6 ms 9728 KB Output is correct
4 Correct 9 ms 9728 KB Output is correct
5 Correct 9 ms 9728 KB Output is correct
6 Correct 6 ms 9728 KB Output is correct
7 Runtime error 190 ms 262148 KB Execution killed with signal 9 (could be triggered by violating memory limits)
8 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 9 ms 9728 KB Output is correct
3 Correct 6 ms 9728 KB Output is correct
4 Correct 9 ms 9728 KB Output is correct
5 Correct 9 ms 9728 KB Output is correct
6 Correct 6 ms 9728 KB Output is correct
7 Runtime error 190 ms 262148 KB Execution killed with signal 9 (could be triggered by violating memory limits)
8 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 9 ms 9728 KB Output is correct
3 Correct 6 ms 9728 KB Output is correct
4 Correct 9 ms 9728 KB Output is correct
5 Correct 9 ms 9728 KB Output is correct
6 Correct 6 ms 9728 KB Output is correct
7 Runtime error 190 ms 262148 KB Execution killed with signal 9 (could be triggered by violating memory limits)
8 Halted 0 ms 0 KB -