oj.uz

Submission #952561

# Submission time Handle Problem Language Result Execution time Memory
952561 2024-03-24T08:54:52 Z PM1 Tug of War (BOI15_tug) C++17
23 / 100
 352 ms 7036 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;
	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[ans+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;i<=gg+k;i++){
		if(b[i]){
			cout<<"YES";
			return 0;
		}
	}
	cout<<"NO";
	return 0;

}

Compilation message

tug.cpp: In function 'int main()':
tug.cpp:70:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   70 |  for(int i=1;i<=nk.size();i++){
      |              ~^~~~~~~~~~~

Subtask #1
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3676 KB Output is correct
2 Incorrect 2 ms 3736 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3676 KB Output is correct
2 Incorrect 2 ms 3736 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 330 ms 7024 KB Output is correct
2 Correct 10 ms 6748 KB Output is correct
3 Correct 323 ms 7032 KB Output is correct
4 Correct 12 ms 6744 KB Output is correct
5 Correct 324 ms 7028 KB Output is correct
6 Correct 10 ms 6748 KB Output is correct
7 Correct 314 ms 7028 KB Output is correct
8 Correct 10 ms 6748 KB Output is correct
9 Correct 352 ms 7024 KB Output is correct
10 Correct 10 ms 6748 KB Output is correct
11 Correct 314 ms 7032 KB Output is correct
12 Correct 10 ms 6748 KB Output is correct
13 Correct 345 ms 7024 KB Output is correct
14 Correct 309 ms 7032 KB Output is correct
15 Correct 12 ms 6748 KB Output is correct
16 Correct 330 ms 7036 KB Output is correct
17 Correct 9 ms 6748 KB Output is correct
18 Correct 330 ms 7024 KB Output is correct
19 Correct 10 ms 6744 KB Output is correct
20 Correct 319 ms 7024 KB Output is correct
21 Correct 11 ms 6744 KB Output is correct
22 Correct 178 ms 6748 KB Output is correct

Subtask #4
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3676 KB Output is correct
2 Incorrect 2 ms 3736 KB Output isn't correct
3 Halted 0 ms 0 KB -