Submission #886782

#	Time	Username	Problem	Language	Result	Execution time	Memory
886782		WonderfulWhale	timeismoney (balkan11_timeismoney)	C++17	75 / 100	850 ms	1740 KiB

timeismoney

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

#define int int64_t
#define pb push_back
#define pii pair<int, int>
#define st first
#define nd second
#define sz(x) (int)(x).size()
#define all(x) (x).begin(), (x).end()

int n, m;
vector<pair<int, pii>> G[209];
vector<pair<pii, pii>> edges;
vector<int> cur;
vector<int> G2[209];
bool used[10009];

bool vis[209];

int p[209];
int Find(int x) {
	return p[x]==x?x:p[x]=Find(p[x]);
}
void Union(int a, int b) {
	p[Find(a)] = Find(b);
}

void dfs(int x, int y) {
	vis[x] = true;
	for(int z:G2[x])
		if(z!=y) 
			dfs(z, x);
}

bool improve() {
	int sum1=0, sum2=0;
	for(int i=0;i<n;i++) G2[i].clear();
	for(int i=0;i<n-1;i++) {
		auto e = edges[cur[i]];
		G2[e.st.st].pb(e.st.nd);
		G2[e.st.nd].pb(e.st.st);
		sum1 += e.nd.st, sum2 += e.nd.nd;
	}
	tuple<int, int, int> Opt = {-1, -1, sum1*sum2};
	for(int i=0;i<n-1;i++) {
		auto e = edges[cur[i]];
		memset(vis, 0, sizeof(vis));
		dfs(e.st.st, e.st.nd);
		for(int j=0;j<m;j++) {
			if(!used[j]) {
				auto ne = edges[j];
				if(vis[ne.st.st]^vis[ne.st.nd]) {
					int nsum1 = sum1-e.nd.st+ne.nd.st;
					int nsum2 = sum2-e.nd.nd+ne.nd.nd;
					if(nsum1*nsum2<(get<2>(Opt))) {
						Opt = {i, j, nsum1*nsum2};
					}
				}
			}
		}
	}
	if(get<0>(Opt)==-1) return false;
	auto [a, b, c] = Opt;
	used[cur[a]] = false;
	cur[a] = b;
	used[b] = true;
	return true;
}
	
int32_t main() {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);

	srand(666);

	cin >> n >> m;
	iota(p, p+n, 0);
	for(int i=0;i<m;i++) {
		int a, b, c, d;
		cin >> a >> b >> c >> d;
		G[a].pb({b, {c, d}});
		G[b].pb({a, {c, d}});
		edges.pb({{a, b}, {c, d}});
	}
	// random_shuffle(all(edges));
	for(int i=0;i<m;i++) {
		auto [x, y] = edges[i];
		if(Find(x.st)!=Find(x.nd)) {
			used[i] = true;
			cur.pb(i);
			Union(x.st, x.nd);
		} 
	}
	while(improve()) {}
	int sum1=0, sum2=0;
	vector<pii> ans;
	for(int x:cur) {
		sum1 += edges[x].nd.st;
		sum2 += edges[x].nd.nd;
		ans.pb(edges[x].st);
	}
	cout << sum1 << " " << sum2 << "\n";
	for(pii x:ans) 
		cout << x.st << " " << x.nd << "\n";
}

• Subtask 1: 75 / 100