Submission #568740

#	Time	Username	Problem	Language	Result	Execution time	Memory
568740		errorgorn	Reconstruction Project (JOI22_reconstruction)	C++17	7 / 100	5073 ms	13200 KiB

reconstruction

#include <bits/stdc++.h>
using namespace std;

#define ii pair<int,int>
#define fi first
#define se second
#define endl '\n'

#define puf push_front
#define pof pop_front
#define pub push_back
#define pob pop_back
#define lb lower_bound
#define ub upper_bound

#define rep(x,s,e) for (int x=(s)-((s)>(e));x!=(e)-((s)>(e));((s)<(e))?x++:x--)
#define all(x) (x).begin(),(x).end()
#define sz(x) (int) (x).size()

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

struct UFDS{
	int p[505];
	int r[505];
	
	void reset(){ rep(x,0,505) p[x]=x,r[x]=0; }
	
	int par(int i){
		if (p[i]==i) return i;
		else return p[i]=par(p[i]);
	}
	
	bool unions(int i,int j){
		i=par(i),j=par(j);
		if (i==j) return false;
		
		if (r[i]<r[j]) swap(i,j);
		p[i]=j;
		if (r[i]==r[j]) r[j]++;
		
		return true;
	}
} ufds;

int n,m,q;
struct E{
	int u,v;
	int w;
};

E ee[100005];

int qu[1000005];
int split[1000005];
long long ans[1000005];

signed main(){
	cin.tie(0);
	cout.tie(0);
	cin.sync_with_stdio(false);
	
	cin>>n>>m;
	rep(x,0,m) cin>>ee[x].u>>ee[x].v>>ee[x].w;
	
	sort(ee,ee+m,[](E i,E j){
		return i.w<j.w;
	});
	
	cin>>q;
	rep(x,0,q) cin>>qu[x];
	
	split[0]=0;
	rep(x,0,q){
		while (split[x]<m && ee[split[x]].w<=qu[x]) split[x]++;
		split[x+1]=split[x];
	}
	
	rep(x,0,q){
		ufds.reset();
		int idx1=split[x]-1,idx2=split[x];
		
		int num=0;
		long long ans=0;
		
		while (num<n-1){
			if (idx2==m || (idx1!=-1 && qu[x]-ee[idx1].w<=ee[idx2].w-qu[x])){
				if (ufds.unions(ee[idx1].u,ee[idx1].v)){
					ans+=qu[x]-ee[idx1].w;
					num++;
				}
				idx1--;
			}
			else{
				if (ufds.unions(ee[idx2].u,ee[idx2].v)){
					ans+=ee[idx2].w-qu[x];
					num++;
				}
				idx2++;				
			}
		}
		
		cout<<ans<<endl;
	}
}

• Subtask 1: 3 / 3
• Subtask 2: 4 / 4
• Subtask 3: 0 / 7
• Subtask 4: 0 / 28
• Subtask 5: 0 / 35
• Subtask 6: 0 / 23