oj.uz

Submission #952564

# Submission time Handle Problem Language Result Execution time Memory
952564 2024-03-24T08:57:36 Z PM1 Tug of War (BOI15_tug) C++17
23 / 100
 317 ms 7248 KB 
#include <bits/stdc++.h>
using namespace std;
#define fr first
#define sc second
const int mxn=3e4+5;
int n,k,f[mxn*2][2],ans=0,st[mxn*2],res=0;
set<int>s[mxn*2];
set<pair<int,int> >g;
bool mark[mxn*2];
vector<int>nk;
void dfs(int z,int dis){
	mark[z]=1;
	int x=*s[z].begin();
	res+=(dis&1)?-st[x]:st[x];
	s[z].erase(x);
	int y=(z>mxn)?f[x][0]:f[x][1]+mxn;
	assert(y!=z);
	s[y].erase(x);
	if(!mark[y])
		dfs(y,dis+1);
}
int main(){
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	cin>>n>>k;
	for(int i=1;i<=n*2;i++){
		int x,y;
		cin>>x>>y>>st[i];
		s[x].insert(i);
		s[y+mxn].insert(i);
		f[i][0]=x;
		f[i][1]=y;
	}
	for(int i=1;i<=n;i++){
		g.insert({s[i].size(),i});
		g.insert({s[i+mxn].size(),i+mxn});
	}
	while(g.size() && g.begin()->fr!=2){
		if(g.begin()->fr==0){
			cout<<"NO";
			return 0;
		}
		int x=g.begin()->sc;
		int y=*s[x].begin();
		s[x].erase(y);
		int z=(x>mxn)?f[y][0]:f[y][1]+mxn;
		s[z].erase(y);
		g.erase({1,x});
		g.erase({s[z].size()+1,z});
		g.insert({s[z].size(),z});
		if(x>mxn)ans+=st[y];
		else ans-=st[y];
	}
	for(int i=1;i<=n;i++){
		if(!s[i].size() || mark[i])continue;
		res=0;
		dfs(i,0);
		nk.push_back(res);
	}
	for(int i=1+mxn;i<=n+mxn;i++){
		if(!s[i].size() || mark[i])continue;
		res=0;
		dfs(i,0);
		if(res<0)res*=-1;
		nk.push_back(res);
	}
	const int gg=20*30000+5,ggg=gg*2;
	bitset<ggg>b;
	b[gg]=1;
	for(int i=1;i<=nk.size();i++){
		int x=nk[i-1];
		b=((b<<x)|(b>>x));
	}
	for(int i=gg-k+ans;i<=gg+k+ans;i++){
		if(b[i]){
			cout<<"YES";
			return 0;
		}
	}
	cout<<"NO";
	return 0;

}

Compilation message

tug.cpp: In function 'int main()':
tug.cpp:71:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   71 |  for(int i=1;i<=nk.size();i++){
      |              ~^~~~~~~~~~~

Subtask #1
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 3672 KB Output is correct
2 Incorrect 2 ms 3676 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 3672 KB Output is correct
2 Incorrect 2 ms 3676 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
23.0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 289 ms 7248 KB Output is correct
2 Correct 9 ms 6748 KB Output is correct
3 Correct 317 ms 7004 KB Output is correct
4 Correct 9 ms 6744 KB Output is correct
5 Correct 292 ms 7028 KB Output is correct
6 Correct 10 ms 6744 KB Output is correct
7 Correct 284 ms 7004 KB Output is correct
8 Correct 11 ms 6748 KB Output is correct
9 Correct 287 ms 7036 KB Output is correct
10 Correct 9 ms 6748 KB Output is correct
11 Correct 284 ms 7004 KB Output is correct
12 Correct 9 ms 6744 KB Output is correct
13 Correct 307 ms 7044 KB Output is correct
14 Correct 280 ms 7004 KB Output is correct
15 Correct 10 ms 6748 KB Output is correct
16 Correct 282 ms 7004 KB Output is correct
17 Correct 10 ms 6744 KB Output is correct
18 Correct 289 ms 7032 KB Output is correct
19 Correct 11 ms 6744 KB Output is correct
20 Correct 286 ms 7000 KB Output is correct
21 Correct 10 ms 6748 KB Output is correct
22 Correct 151 ms 6748 KB Output is correct

Subtask #4
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 3672 KB Output is correct
2 Incorrect 2 ms 3676 KB Output isn't correct
3 Halted 0 ms 0 KB -