oj.uz

Submission #886784

# Submission time Handle Problem Language Result Execution time Memory
886784 2023-12-12T23:14:36 Z WonderfulWhale timeismoney (balkan11_timeismoney) C++17
80 / 100
 1754 ms 1520 KB 
#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;
	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}});
	}
	int SUM1=1e9, SUM2=1e9;
	vector<pii> ANS;
	for(int k=0;k<2;k++) {
		iota(p, p+n, 0);
		random_shuffle(all(edges));
		cur.clear();
		memset(used, 0, sizeof(used));
		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);
		}
		if(sum1*sum2<SUM1*SUM2) {
			SUM1 = sum1;
			SUM2 = sum2;
			ANS = ans;
		}
	}
	cout << SUM1 << " " << SUM2 << "\n";
	for(pii x:ANS) cout << x.st << " " << x.nd << "\n";
}

Subtask #1
80.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 344 KB Output is correct
5 Correct 20 ms 544 KB Output is correct
6 Correct 30 ms 528 KB Output is correct
7 Correct 361 ms 688 KB Output is correct
8 Correct 1480 ms 1508 KB Output is correct
9 Correct 1 ms 548 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 20 ms 540 KB Output is correct
15 Correct 29 ms 344 KB Output is correct
16 Incorrect 356 ms 696 KB Output isn't correct
17 Incorrect 368 ms 604 KB Output isn't correct
18 Incorrect 431 ms 708 KB Output isn't correct
19 Correct 1754 ms 1520 KB Output is correct
20 Incorrect 1703 ms 1500 KB Output isn't correct