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Submission #218751

# Submission time Handle Problem Language Result Execution time Memory
218751 2020-04-02T17:05:59 Z ryansee Olympic Bus (JOI20_ho_t4) C++14
100 / 100
 467 ms 5248 KB 
#include "bits/stdc++.h"
using namespace std;

#define FAST ios_base::sync_with_stdio(false); cin.tie(0);
#define pb push_back
#define eb emplace_back
#define ins insert
#define f first
#define s second
#define cbr cerr << "hi\n"
#define mmst(x, v) memset((x), v, sizeof ((x)))
#define siz(x) ll(x.size())
#define all(x) (x).begin(), (x).end()
#define lbd(x,y) (lower_bound(all(x),y)-x.begin())
#define ubd(x,y) (upper_bound(all(x),y)-x.begin())
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());    //can be used by calling rng() or shuffle(A, A+n, rng)
inline long long rand(long long x, long long y) { return (rng() % (y+1-x)) + x; } //inclusivesss
string inline to_string(char c) {string s(1,c);return s;} template<typename T> inline T gcd(T a,T b){ return a==0?llabs(b):gcd(b%a,a); }

typedef long long ll; 
typedef long double ld;
#define FOR(i,s,e) for(ll i=s;i<=ll(e);++i)
#define DEC(i,s,e) for(ll i=s;i>=ll(e);--i)
typedef pair<ll,ll>pi; typedef pair<ll,pi>spi; typedef pair<pi,pi>dpi;

#define LLINF ((long long)1e18)
#define INF int(1e9+1e6)
#define MAXN (50006)
ll n,m,dist[206][206],disty[206];
vector<ll>v[206];
struct edge{
	ll a,b,c,d;
}E[MAXN];
ll sp(ll start,ll ep){
	mmst(disty,-1);
	priority_queue<pi,vector<pi>,greater<pi>> pq;
	disty[start]=0, pq.emplace(disty[start],start);
	while(pq.size()){
		ll x=pq.top().s,d=pq.top().f;
		pq.pop();
		if(disty[x]^d)continue;
		for(auto i:v[x]) if(E[i].a==x&&(disty[E[i].b]==-1||disty[E[i].b]>d+E[i].c)) {
			disty[E[i].b]=d+E[i].c;
			pq.emplace(disty[E[i].b],E[i].b);
		}
	}
	return disty[ep] == -1 ? LLINF : disty[ep];
}
ll get_dist(){
	return sp(1,n) + sp(n,1);
}
int main(){
	FAST
	cin>>n>>m;
	FOR(i,1,n)FOR(j,1,n)dist[i][j]=(i==j)?0:LLINF;
	FOR(i,1,m){
		ll a,b,c,d;cin>>a>>b>>c>>d;
		v[a].pb(i), v[b].pb(i);
		E[i]={a,b,c,d};
		dist[a][b]=min(dist[a][b],c);
	}
	FOR(k,1,n)FOR(i,1,n)FOR(j,1,n)dist[i][j]=min(dist[i][j],dist[i][k]+dist[k][j]);
	ll ans=min(LLINF,dist[1][n]+dist[n][1]);
	vector<int> p; FOR(i,1,m)p.pb(i); shuffle(all(p),rng);
	shuffle(all(p),rng);
	for(auto i:p) if(min(dist[1][n],dist[1][E[i].b]+E[i].c+dist[E[i].a][n])+min(dist[n][1],dist[n][E[i].b]+E[i].c+dist[E[i].a][1])+E[i].d < ans) {
		swap(E[i].a,E[i].b);
		ans=min(ans,get_dist()+E[i].d);
		swap(E[i].a,E[i].b);
	}
	if(ans>=LLINF)ans=-1;
	cout<<ans<<'\n';
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 768 KB Output is correct
2 Correct 13 ms 768 KB Output is correct
3 Correct 14 ms 768 KB Output is correct
4 Correct 14 ms 768 KB Output is correct
5 Correct 5 ms 512 KB Output is correct
6 Correct 13 ms 768 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 4 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 19 ms 768 KB Output is correct
11 Correct 33 ms 896 KB Output is correct
12 Correct 15 ms 768 KB Output is correct
13 Correct 14 ms 768 KB Output is correct
14 Correct 14 ms 768 KB Output is correct
15 Correct 15 ms 768 KB Output is correct
16 Correct 14 ms 768 KB Output is correct

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 39 ms 4984 KB Output is correct
2 Correct 42 ms 4856 KB Output is correct
3 Correct 40 ms 5000 KB Output is correct
4 Correct 15 ms 896 KB Output is correct
5 Correct 14 ms 768 KB Output is correct
6 Correct 14 ms 768 KB Output is correct
7 Correct 14 ms 768 KB Output is correct
8 Correct 5 ms 384 KB Output is correct
9 Correct 54 ms 5000 KB Output is correct
10 Correct 53 ms 5112 KB Output is correct
11 Correct 41 ms 5112 KB Output is correct
12 Correct 43 ms 4988 KB Output is correct
13 Correct 42 ms 5120 KB Output is correct
14 Correct 43 ms 5248 KB Output is correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 768 KB Output is correct
2 Correct 13 ms 640 KB Output is correct
3 Correct 31 ms 3968 KB Output is correct
4 Correct 14 ms 640 KB Output is correct
5 Correct 36 ms 4736 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 47 ms 4856 KB Output is correct
9 Correct 42 ms 4752 KB Output is correct
10 Correct 37 ms 4856 KB Output is correct
11 Correct 38 ms 4744 KB Output is correct
12 Correct 37 ms 4872 KB Output is correct
13 Correct 5 ms 384 KB Output is correct
14 Correct 5 ms 384 KB Output is correct
15 Correct 5 ms 384 KB Output is correct
16 Correct 5 ms 384 KB Output is correct
17 Correct 5 ms 384 KB Output is correct
18 Correct 5 ms 384 KB Output is correct
19 Correct 38 ms 4872 KB Output is correct
20 Correct 40 ms 4856 KB Output is correct
21 Correct 39 ms 4856 KB Output is correct
22 Correct 39 ms 4864 KB Output is correct

Subtask #4
63.0 / 63.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 768 KB Output is correct
2 Correct 13 ms 768 KB Output is correct
3 Correct 14 ms 768 KB Output is correct
4 Correct 14 ms 768 KB Output is correct
5 Correct 5 ms 512 KB Output is correct
6 Correct 13 ms 768 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 4 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 19 ms 768 KB Output is correct
11 Correct 33 ms 896 KB Output is correct
12 Correct 15 ms 768 KB Output is correct
13 Correct 14 ms 768 KB Output is correct
14 Correct 14 ms 768 KB Output is correct
15 Correct 15 ms 768 KB Output is correct
16 Correct 14 ms 768 KB Output is correct
17 Correct 39 ms 4984 KB Output is correct
18 Correct 42 ms 4856 KB Output is correct
19 Correct 40 ms 5000 KB Output is correct
20 Correct 15 ms 896 KB Output is correct
21 Correct 14 ms 768 KB Output is correct
22 Correct 14 ms 768 KB Output is correct
23 Correct 14 ms 768 KB Output is correct
24 Correct 5 ms 384 KB Output is correct
25 Correct 54 ms 5000 KB Output is correct
26 Correct 53 ms 5112 KB Output is correct
27 Correct 41 ms 5112 KB Output is correct
28 Correct 43 ms 4988 KB Output is correct
29 Correct 42 ms 5120 KB Output is correct
30 Correct 43 ms 5248 KB Output is correct
31 Correct 14 ms 768 KB Output is correct
32 Correct 13 ms 640 KB Output is correct
33 Correct 31 ms 3968 KB Output is correct
34 Correct 14 ms 640 KB Output is correct
35 Correct 36 ms 4736 KB Output is correct
36 Correct 5 ms 384 KB Output is correct
37 Correct 5 ms 384 KB Output is correct
38 Correct 47 ms 4856 KB Output is correct
39 Correct 42 ms 4752 KB Output is correct
40 Correct 37 ms 4856 KB Output is correct
41 Correct 38 ms 4744 KB Output is correct
42 Correct 37 ms 4872 KB Output is correct
43 Correct 5 ms 384 KB Output is correct
44 Correct 5 ms 384 KB Output is correct
45 Correct 5 ms 384 KB Output is correct
46 Correct 5 ms 384 KB Output is correct
47 Correct 5 ms 384 KB Output is correct
48 Correct 5 ms 384 KB Output is correct
49 Correct 38 ms 4872 KB Output is correct
50 Correct 40 ms 4856 KB Output is correct
51 Correct 39 ms 4856 KB Output is correct
52 Correct 39 ms 4864 KB Output is correct
53 Correct 40 ms 4856 KB Output is correct
54 Correct 39 ms 4844 KB Output is correct
55 Correct 39 ms 4744 KB Output is correct
56 Correct 14 ms 768 KB Output is correct
57 Correct 14 ms 768 KB Output is correct
58 Correct 35 ms 3968 KB Output is correct
59 Correct 38 ms 4088 KB Output is correct
60 Correct 46 ms 4088 KB Output is correct
61 Correct 38 ms 3960 KB Output is correct
62 Correct 151 ms 4088 KB Output is correct
63 Correct 328 ms 3960 KB Output is correct
64 Correct 112 ms 4268 KB Output is correct
65 Correct 245 ms 4288 KB Output is correct
66 Correct 467 ms 4408 KB Output is correct
67 Correct 24 ms 3444 KB Output is correct
68 Correct 60 ms 4992 KB Output is correct
69 Correct 55 ms 4992 KB Output is correct
70 Correct 41 ms 4984 KB Output is correct
71 Correct 45 ms 5112 KB Output is correct
72 Correct 41 ms 5000 KB Output is correct
73 Correct 40 ms 5112 KB Output is correct
74 Correct 42 ms 5112 KB Output is correct