Submission #568943

#	Time	Username	Problem	Language	Result	Execution time	Memory
568943		HappyPacMan	Bridges (APIO19_bridges)	C++14	14 / 100	102 ms	7272 KiB

bridges

#include <bits/stdc++.h>
using namespace std;
const int maxn = 5e4 + 2;
vector<tuple<int,int,int> > edge;
int dsu[maxn],sz[maxn],res[maxn<<1];

int f(int x){
	return dsu[x] = dsu[x] == x ? dsu[x] : f(dsu[x]);
}
void join(int x,int y){
	x = f(x), y = f(y);
	if(x != y){
		dsu[x] = y;
		sz[y] += sz[x];
	}
}

int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);

	int n,m;
	cin >> n >> m;
	for(int i=1;i<=m;i++){
		int u,v,w;
		cin >> u >> v >> w;
		edge.emplace_back(-w,u,v);
	}
	sort(edge.begin(),edge.end());
	int q;
	cin >> q;
	vector<tuple<int,int,int> > query;
	for(int i=1;i<=n;i++){
		dsu[i] = i;
		sz[i] = 1;
	}
	for(int i=0;i<q;i++){
		int t,x,y;
		cin >> t >> x >> y;
		query.emplace_back(-y,x,i);
	}
	sort(query.begin(),query.end());
	for(int i=0,j=0;i<q;i++){
		while(j<m && get<0>(edge[j]) <= get<0>(query[i])){
			join(get<1>(edge[j]),get<2>(edge[j]));
			j++;
		}
		res[get<2>(query[i])] = sz[f(get<1>(query[i]))];
	}
	for(int i=0;i<q;i++){
		cout << res[i] << '\n';
	}
}

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