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Submission #205878

# Submission time Handle Problem Language Result Execution time Memory
205878 2020-03-01T09:42:49 Z mraron Cheap flights (LMIO18_pigus_skrydziai) C++14
12 / 100
 3000 ms 45824 KB 
#include<bits/stdc++.h>
using namespace std;
int n,m;
typedef long long ll;
struct el {
	int a,b;
	ll c;
	bool operator<(const el& masik) const {
		if(a==masik.a) return b<masik.b;
		return a<masik.a;
	}
};
vector<el> lst;
vector<pair<int, ll>> adj[300001];
ll cost(int a, int b) {
	if(a>b) swap(a,b);
	auto it=lower_bound(lst.begin(),lst.end(), el{a,b,0});
	if(it==lst.end() || it->a!=a || it->b!=b) return 0;
	return it->c;
}
int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	cin>>n>>m;
	for(int i=0;i<m;++i) {
		int a,b,c;
		cin>>a>>b>>c;
		lst.push_back({min(a,b),max(a,b),c});
		adj[a].push_back({b,c});
		adj[b].push_back({a,c});
	}
	sort(lst.begin(),lst.end());
	ll ans=0;
	for(int i=1;i<=n;++i) {
		ll cans=0;
		for(auto j:adj[i]) {
			cans+=j.second;
		}
		ans=max(ans, cans);
	}
	
	const int lim=sqrt(300000);
	for(int i=1;i<=n;++i) {
		if(adj[i].size()<=lim) {
			for(int j=0;j<adj[i].size();++j) {
				for(int k=j+1;k<adj[i].size();++k) {
					ans=max(ans, adj[i][j].second+adj[i][k].second+cost(adj[i][j].first, adj[i][k].first));
				}
			}
		}else {
			vector<int> kell(n+1);
			for(auto i:adj[i]) {
				kell[i.first]=i.second;
			}
			for(auto i:lst) {
				if(kell[i.a] && kell[i.b]) ans=max(ans, kell[i.a]+kell[i.b]+i.c);
			}
		}
	}
	cout<<ans<<"\n";
	return 0;
}

Compilation message

pigus_skrydziai.cpp: In function 'int main()':
pigus_skrydziai.cpp:46:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int j=0;j<adj[i].size();++j) {
                ~^~~~~~~~~~~~~~
pigus_skrydziai.cpp:47:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int k=j+1;k<adj[i].size();++k) {
                   ~^~~~~~~~~~~~~~

Subtask #1
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 7416 KB Output is correct
2 Correct 9 ms 7416 KB Output is correct
3 Correct 10 ms 7416 KB Output is correct
4 Correct 9 ms 7416 KB Output is correct
5 Correct 12 ms 7416 KB Output is correct
6 Correct 261 ms 8944 KB Output is correct
7 Correct 9 ms 7416 KB Output is correct
8 Correct 9 ms 7416 KB Output is correct
9 Correct 9 ms 7416 KB Output is correct
10 Correct 9 ms 7416 KB Output is correct
11 Correct 10 ms 7416 KB Output is correct
12 Correct 9 ms 7416 KB Output is correct
13 Correct 10 ms 7416 KB Output is correct
14 Correct 9 ms 7416 KB Output is correct
15 Correct 9 ms 7416 KB Output is correct
16 Correct 10 ms 7416 KB Output is correct
17 Correct 9 ms 7416 KB Output is correct
18 Correct 12 ms 7416 KB Output is correct
19 Correct 14 ms 7544 KB Output is correct
20 Correct 10 ms 7416 KB Output is correct
21 Correct 9 ms 7416 KB Output is correct

Subtask #2
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 7416 KB Output is correct
2 Correct 9 ms 7416 KB Output is correct
3 Correct 10 ms 7416 KB Output is correct
4 Correct 9 ms 7416 KB Output is correct
5 Correct 12 ms 7416 KB Output is correct
6 Correct 261 ms 8944 KB Output is correct
7 Correct 9 ms 7416 KB Output is correct
8 Correct 9 ms 7416 KB Output is correct
9 Correct 9 ms 7416 KB Output is correct
10 Correct 9 ms 7416 KB Output is correct
11 Correct 10 ms 7416 KB Output is correct
12 Correct 9 ms 7416 KB Output is correct
13 Correct 10 ms 7416 KB Output is correct
14 Correct 9 ms 7416 KB Output is correct
15 Correct 9 ms 7416 KB Output is correct
16 Correct 10 ms 7416 KB Output is correct
17 Correct 9 ms 7416 KB Output is correct
18 Correct 12 ms 7416 KB Output is correct
19 Correct 14 ms 7544 KB Output is correct
20 Correct 10 ms 7416 KB Output is correct
21 Correct 9 ms 7416 KB Output is correct
22 Execution timed out 3061 ms 45824 KB Time limit exceeded
23 Halted 0 ms 0 KB -

Subtask #3
0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 125 ms 21860 KB Output is correct
2 Correct 340 ms 33756 KB Output is correct
3 Correct 91 ms 15588 KB Output is correct
4 Correct 194 ms 23516 KB Output is correct
5 Correct 528 ms 33244 KB Output is correct
6 Execution timed out 3033 ms 14564 KB Time limit exceeded
7 Halted 0 ms 0 KB -

Subtask #4
0 / 47.0

# Verdict Execution time Memory Grader output
1 Correct 125 ms 21860 KB Output is correct
2 Correct 340 ms 33756 KB Output is correct
3 Correct 91 ms 15588 KB Output is correct
4 Correct 194 ms 23516 KB Output is correct
5 Correct 528 ms 33244 KB Output is correct
6 Execution timed out 3033 ms 14564 KB Time limit exceeded
7 Halted 0 ms 0 KB -