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Submission #127483

# Submission time Handle Problem Language Result Execution time Memory
127483 2019-07-09T12:33:43 Z TadijaSebez Tug of War (BOI15_tug) C++11
23 / 100
 53 ms 13468 KB 
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
const int N=60050;
vector<pair<int,int>> E[N];
bool was[N];
int n,k;
int sum[2],deg[N];
int sum_dp[N*20],go[N*20];
bool dp[N*20];
int main()
{
	int u,v,w;
	scanf("%i %i",&n,&k);
	for(int i=1;i<=2*n;i++)
	{
		scanf("%i %i %i",&u,&v,&w);
		v+=n;
		E[u].pb({v,w});
		E[v].pb({u,w});
		deg[u]++;
		deg[v]++;
	}
	queue<int> q;
	for(int i=1;i<=2*n;i++) if(deg[i]==1) q.push(i),was[i]=1;
	while(q.size())
	{
		int x=q.front();
		q.pop();
		int b=x>n;
		bool ok=0;
		for(auto e:E[x]) if(!was[e.first])
		{
			ok=1;
			v=e.first;
			w=e.second;
		}
		if(!ok || deg[v]==1) return 0*printf("NO\n");
        sum[b]+=w;
        deg[v]--;
		if(deg[v]==1) was[v]=1,q.push(v);
	}
	for(int i=1;i<=2*n;i++) if(!was[i] && deg[i]!=2) return 0*printf("NO\n");
	vector<int> cyc;
	for(int i=1;i<=2*n;i++) if(!was[i])
	{
		int all=0;
		int par=0;
		for(int x=i,t=1,y;;t=-t)
		{
			int w;
			was[x]=1;
			bool ok=0;
			for(auto e:E[x]) if(deg[e.first]==2 && e.first!=par)
			{
				y=e.first;
				w=e.second;
				ok=1;
			}
			if(!ok)
			{
				vector<int> ws;
				for(auto e:E[i]) if(deg[e.first]==2) ws.pb(e.second);
				all=ws[0]-ws[1];
				break;
			}
			all+=t*w;
			par=x;
			x=y;
			if(x==i) break;
		}
		cyc.pb(all);
	}
	/*set<int> dp;
	dp.insert(sum[1]-sum[0]);
	for(int x:cyc)
	{
		vector<int> ins;
		for(int y:dp)
		{
			ins.pb(y+x);
			ins.pb(y-x);
		}
		dp.clear();
		for(int y:ins) dp.insert(y);
	}
	int ans=1e9;
	for(int y:dp) ans=min(ans,abs(y));*/
	/*const int lim=N*10;
	bitset<lim> dp;
	dp[lim/2+sum[1]-sum[0]]=1;
	for(int x:cyc)
	{
		x=abs(x);
		dp=(dp>>x)|(dp<<x);
	}
	int ans=1e9;
	for(int i=0;i<N*20;i++) if(dp[i])
	{
		int x=abs(lim/2-i);
		ans=min(ans,x);
	}*/
	dp[N*10+sum[1]-sum[0]]=1;
	for(int &x:cyc) x=abs(x);
	sort(cyc.begin(),cyc.end());
	for(int i=0,j=0;i<cyc.size();i=j)
	{
		int cnt=0;
		for(j=i;j<cyc.size() && cyc[i]==cyc[j];j++) cnt++;
		for(int k=0;k<N*20;k++) sum_dp[k]=dp[k]+(k>=cyc[i]*2?sum_dp[k-cyc[i]*2]:0);
		for(int k=0;k<N*20;k++)
		{
			/*if(k<cyc[i]*2) go[k]=k+cyc[i]*cnt;
			else
			{
				go[k]=go[k-cyc[i]*2];
				if(go[k]+cyc[i]*2<N*20) go[k]+=cyc[i]*2;
			}*/
			go[k]=k+cyc[i]*cnt;
			if(go[k]<N*20)
			{
				int tmp=sum_dp[go[k]];//-(k-cyc[i]*cnt>=0?sum_dp[k-cyc[i]*cnt]-dp[k-cyc[i]*cnt]:0);
				if(k-cyc[i]*cnt>=0) tmp-=sum_dp[k-cyc[i]*cnt]-dp[k-cyc[i]*cnt];
				if(tmp>0) dp[k]=1;
				else dp[k]=0;
			}
		}
	}
	int ans=1e9+7;
	for(int i=0;i<N*20;i++) if(dp[i]) ans=min(ans,abs(N*10-i));
	//printf("%i\n",ans);
	if(ans<=k) printf("YES\n");
	else printf("NO\n");
	return 0;
}

Compilation message

tug.cpp: In function 'int main()':
tug.cpp:106:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0,j=0;i<cyc.size();i=j)
                  ~^~~~~~~~~~~
tug.cpp:109:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(j=i;j<cyc.size() && cyc[i]==cyc[j];j++) cnt++;
           ~^~~~~~~~~~~
tug.cpp:14:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%i %i",&n,&k);
  ~~~~~^~~~~~~~~~~~~~~
tug.cpp:17:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%i %i %i",&u,&v,&w);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 18.0

# Verdict Execution time Memory Grader output
1 Incorrect 53 ms 12280 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 30.0

# Verdict Execution time Memory Grader output
1 Incorrect 53 ms 12280 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
23.0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 33 ms 13176 KB Output is correct
2 Correct 14 ms 2940 KB Output is correct
3 Correct 33 ms 13356 KB Output is correct
4 Correct 14 ms 2812 KB Output is correct
5 Correct 36 ms 13432 KB Output is correct
6 Correct 14 ms 2808 KB Output is correct
7 Correct 32 ms 13304 KB Output is correct
8 Correct 15 ms 2808 KB Output is correct
9 Correct 32 ms 13432 KB Output is correct
10 Correct 15 ms 2808 KB Output is correct
11 Correct 32 ms 13404 KB Output is correct
12 Correct 14 ms 2808 KB Output is correct
13 Correct 32 ms 13432 KB Output is correct
14 Correct 32 ms 13432 KB Output is correct
15 Correct 14 ms 2936 KB Output is correct
16 Correct 32 ms 13304 KB Output is correct
17 Correct 15 ms 2808 KB Output is correct
18 Correct 32 ms 13432 KB Output is correct
19 Correct 14 ms 2808 KB Output is correct
20 Correct 32 ms 13304 KB Output is correct
21 Correct 14 ms 2808 KB Output is correct
22 Correct 32 ms 13468 KB Output is correct

Subtask #4
0 / 29.0

# Verdict Execution time Memory Grader output
1 Incorrect 53 ms 12280 KB Output isn't correct
2 Halted 0 ms 0 KB -