Submission #259284

#	Time	Username	Problem	Language	Result	Execution time	Memory
259284		alishahali1382	Bridges (APIO19_bridges)	C++14	14 / 100	2273 ms	4988 KiB

bridges

#include <bits/stdc++.h>
#pragma GCC optimize ("O2,unroll-loops")
//#pragma GCC optimize("no-stack-protector,fast-math")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")

using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<pii, int> piii;
typedef pair<ll, ll> pll;
#define debug(x) cerr<<#x<<'='<<(x)<<endl;
#define debugp(x) cerr<<#x<<"= {"<<(x.first)<<", "<<(x.second)<<"}"<<endl;
#define debug2(x, y) cerr<<"{"<<#x<<", "<<#y<<"} = {"<<(x)<<", "<<(y)<<"}"<<endl;
#define debugv(v) {cerr<<#v<<" : ";for (auto x:v) cerr<<x<<' ';cerr<<endl;}
#define all(x) x.begin(), x.end()
#define pb push_back
#define kill(x) return cout<<x<<'\n', 0;

const int inf=1000000010;
const ll INF=10000000000000010LL;
const int mod=1000000007;
const int MAXN=100010, SQ=240;

int n, m, q, u, v, x, y, t, a, b;
int E[MAXN][2], W[MAXN], W2[MAXN];
int typ[MAXN], A[MAXN], B[MAXN], ans[MAXN];
int ind[MAXN], ind1[MAXN], ind2[MAXN], m1, m2;
int par[MAXN], sz[MAXN], par2[MAXN], sz2[MAXN], comp[MAXN];
int bad[MAXN], vec[MAXN], ted;
pii Q[SQ+1];
pair<int*, int> todo[MAXN];
int TDO;

inline bool cmp(int x, int y){ return W[x]>W[y];}
int getpar(int x){ return (par[x]==x?x:par[x]=getpar(par[x]));}
inline void join(int x, int y){
	x=getpar(x);
	y=getpar(y);
	if (x==y) return ;
	if (sz[x]<sz[y]) swap(x, y);
	sz[x]+=sz[y];
	par[y]=x;
}
inline int getpar2(int x){
	while (x^par[x]) x=par[x];
	return x;
}
inline void join2(int x, int y){
	x=getpar2(x);
	y=getpar2(y);
	if (x==y) return ;
	if (sz[x]<sz[y]) swap(x, y);
	todo[TDO++]={sz+x, sz[x]+sz[y]};
	todo[TDO++]={par+y, y};
	sz[x]+=sz[y];
	par[y]=x;
}
inline void undo(){
	while (TDO){
		TDO--;
		(*todo[TDO].first)=todo[TDO].second;
	}
}

int main(){
	ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
	//freopen("input.txt", "r", stdin);
	//freopen("output.txt", "w", stdout);
	cin>>n>>m;
	for (int i=1; i<=m; i++) cin>>E[i][0]>>E[i][1]>>W[i], ind[i]=i;
	sort(ind+1, ind+m+1, cmp);
	cin>>q;
	for (int i=0; i<q; i++) cin>>typ[i]>>A[i]>>B[i];
	for (int block=0; block*SQ<q; block++){
		for (int i=1; i<=n; i++) par[i]=i, sz[i]=1;
		int ql=block*SQ, qr=min(q, ql+SQ);
		ted=0;
		for (int i=ql; i<qr; i++){
			if (typ[i]==1) bad[A[i]]=1;
			else vec[ted++]=A[i];
		}
		for (int i=1; i<=m; i++) if (bad[i]) vec[ted++]=E[i][0], vec[ted++]=E[i][1];
		sort(vec, vec+ted);
		ted=unique(vec, vec+ted)-vec;
		
		int qq=0;
		for (int i=ql; i<qr; i++) if (typ[i]==2) Q[++qq]={B[i], i};
		sort(Q+1, Q+qq+1);
		m1=m2=0;
		for (int i=1; i<=m; i++){
			if (bad[ind[i]]) ind1[++m1]=ind[i];
			else ind2[++m2]=ind[i];
		}
		
		ind2[m2+1]=0;
		for (int i=1; i<=m2+1; i++){
			int e=ind2[i];
			while (qq && Q[qq].first>W[e]){
				int id=Q[qq--].second;
				for (int j=1; j<=m1; j++) W2[ind1[j]]=W[ind1[j]];
				for (int j=ql; j<id; j++) if (typ[j]==1) W2[A[j]]=B[j];
				
				for (int j=1; j<=m1; j++) if (W2[ind1[j]]>=B[id])
					join2(E[ind1[j]][0], E[ind1[j]][1]);
				
				ans[id]=sz[getpar2(A[id])];
				undo();
			}
			join(E[e][0], E[e][1]);
		}
		for (int i=ql; i<qr; i++) if (typ[i]==1) W[A[i]]=B[i];
		sort(ind1+1, ind1+m1+1, cmp);
		merge(ind1+1, ind1+m1+1, ind2+1, ind2+m2+1, ind+1, cmp);
		
		for (int i=ql; i<qr; i++) if (typ[i]==1) bad[A[i]]=0;
	}
	for (int i=0; i<q; i++) if (typ[i]==2) cout<<ans[i]<<"\n";
	
	return 0;
}

• Subtask 1: 0 / 13
• Subtask 2: 0 / 16
• Subtask 3: 0 / 17
• Subtask 4: 14 / 14
• Subtask 5: 0 / 13
• Subtask 6: 0 / 27