oj.uz

Submission #952554

# Submission time Handle Problem Language Result Execution time Memory
952554 2024-03-24T08:44:53 Z PM1 Tug of War (BOI15_tug) C++17
23 / 100
 34 ms 6744 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*3000+5,ggg=gg*2;
	bitset<ggg>b[2];
	b[0][ans+gg]=1;
	for(int i=1;i<=nk.size();i++){
		int j=i&1,x=nk[i-1];
		b[j]=((b[j^1]<<x)|(b[j^1]>>x));
	}
	for(int i=gg-k;i<=gg+k;i++){
		if(b[nk.size()&1][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 1 ms 3160 KB Output is correct
2 Incorrect 1 ms 3164 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 3160 KB Output is correct
2 Incorrect 1 ms 3164 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 29 ms 6492 KB Output is correct
2 Correct 10 ms 6236 KB Output is correct
3 Correct 29 ms 6492 KB Output is correct
4 Correct 9 ms 6236 KB Output is correct
5 Correct 30 ms 6744 KB Output is correct
6 Correct 11 ms 6236 KB Output is correct
7 Correct 34 ms 6516 KB Output is correct
8 Correct 9 ms 6236 KB Output is correct
9 Correct 30 ms 6520 KB Output is correct
10 Correct 10 ms 6204 KB Output is correct
11 Correct 29 ms 6492 KB Output is correct
12 Correct 9 ms 6236 KB Output is correct
13 Correct 29 ms 6492 KB Output is correct
14 Correct 29 ms 6492 KB Output is correct
15 Correct 9 ms 6236 KB Output is correct
16 Correct 30 ms 6416 KB Output is correct
17 Correct 9 ms 6232 KB Output is correct
18 Correct 33 ms 6492 KB Output is correct
19 Correct 9 ms 6232 KB Output is correct
20 Correct 30 ms 6492 KB Output is correct
21 Correct 10 ms 6232 KB Output is correct
22 Correct 24 ms 6232 KB Output is correct

Subtask #4
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 3160 KB Output is correct
2 Incorrect 1 ms 3164 KB Output isn't correct
3 Halted 0 ms 0 KB -