oj.uz

Submission #314955

# Submission time Handle Problem Language Result Execution time Memory
314955 2020-10-21T17:22:31 Z aZvezda Olympic Bus (JOI20_ho_t4) C++14
100 / 100
 402 ms 8212 KB 
#include <bits/stdc++.h>
using namespace std;
//#pragma GCC optimize ("O3")
//#pragma GCC target ("sse4")
#define endl "\n"
typedef long long ll;
template<class T, class T2> inline ostream &operator <<(ostream &out, const pair<T, T2> &x) { out << x.first << " " << x.second; return out;}
template<class T, class T2> inline istream &operator >>(istream &in, pair<T, T2> &x) { in >> x.first >> x.second; return in;}
template<class T, class T2> inline bool chkmax(T &x, const T2 &y) { return x < y ? x = y, 1 : 0; }
template<class T, class T2> inline bool chkmin(T &x, const T2 &y) { return x > y ? x = y, 1 : 0; }
const ll mod = 1e12 + 7;
#define out(x) "{" << (#x) << ": " << x << "} "
 
const ll MAX_N = 2e2 + 10, MAX_W = 1e5 + 10;
vector<pair<pair<int, int>, pair<ll, ll> > > edges;
bitset<MAX_W> off;
vector<pair<pair<int, ll>, int> > g[MAX_N];
ll dist[2][MAX_N];
int n, m;
 
void dij(ll ind, ll start) {
	for(ll i = 0; i < MAX_N; i ++) {
		dist[ind][i] = mod;
	}
	priority_queue<pair<ll, ll> > pq;
	pq.push({0, start});
	dist[ind][start] = 0;
	while(!pq.empty()) {
		auto curr = pq.top(); pq.pop();
		curr.first *= -1;
      	if(curr.first != dist[ind][curr.second]) {continue;}
		for(auto it : g[curr.second]) {
			if(off[it.second]) {continue;}
			ll nxt = it.first.first;
			if(dist[ind][nxt] > curr.first + it.first.second) {
				dist[ind][nxt] = curr.first + it.first.second;
				pq.push({-dist[ind][nxt], nxt});
			}	
		}
	}
	return;
	cout << "Started from " << start << endl;
	for(ll i = 1; i <= n; i ++) {
		cout << dist[ind][i] << " ";
	}
	cout << endl;
} 
 
ll distFull[MAX_N][MAX_N];
 
signed main() {
	ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
	for(ll i = 0; i < MAX_N; i ++) {
		for(ll j = 0; j < MAX_N; j ++) {
			distFull[i][j] = mod;
		}
	}
	for(ll i = 0; i < MAX_N; i ++) {
		distFull[i][i] = 0;
	} 
	
	cin >> n >> m;
	edges.resize(m);
	for(ll i = 0; i < m; i ++) {
		cin >> edges[i];
	}
	random_shuffle(edges.begin(), edges.end());
 
	for(int i = 0; i < m; i ++) {
		off[2 * i] = false;
		off[2 * i + 1] = true;
		g[edges[i].first.first].push_back({{edges[i].first.second, edges[i].second.first}, 2 * i}); 
		g[edges[i].first.second].push_back({{edges[i].first.first, edges[i].second.first}, 2 * i + 1}); 
		chkmin(distFull[edges[i].first.first][edges[i].first.second], edges[i].second.first);
	}
	for(ll k = 1; k <= n; k ++) {
		for(ll i = 1; i <= n; i ++) {
			for(ll j = 1; j <= n; j ++) {
				chkmin(distFull[i][j], distFull[i][k] + distFull[k][j]);
			}
		}
	}
	ll ret = distFull[1][n] + distFull[n][1];
	vector<pair<ll, int> > indices;
	for(int i = 0; i < m; i ++) {
		ll u = edges[i].first.first, v = edges[i].first.second, cost = edges[i].second.first, price = edges[i].second.second;
		ll firstHalf = min(distFull[1][v] + cost + distFull[u][n], (ll)distFull[1][n]);
		ll secondHalf = min(distFull[n][v] + cost + distFull[u][1], (ll)distFull[n][1]);
		indices.push_back({firstHalf + secondHalf + price, i});
	}
	sort(indices.begin(), indices.end());
	for(ll i = 0; i < m; i ++) {
		int ind = indices[i].second;
		if(indices[i].first >= ret) {continue;}
		off[2 * ind] = true;
		off[2 * ind + 1] = false;
		dij(0, 1);
		dij(1, n);
		chkmin(ret, edges[ind].second.second + dist[0][n] + dist[1][1]);
		off[2 * ind] = false;
		off[2 * ind + 1] = true;
	}
	if(ret < mod) {
		cout << ret << endl;
	} else {
		cout << -1 << endl;
	}
	return 0;
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 768 KB Output is correct
2 Correct 9 ms 768 KB Output is correct
3 Correct 11 ms 768 KB Output is correct
4 Correct 11 ms 768 KB Output is correct
5 Correct 1 ms 768 KB Output is correct
6 Correct 9 ms 768 KB Output is correct
7 Correct 1 ms 640 KB Output is correct
8 Correct 1 ms 640 KB Output is correct
9 Correct 1 ms 760 KB Output is correct
10 Correct 18 ms 768 KB Output is correct
11 Correct 28 ms 896 KB Output is correct
12 Correct 13 ms 896 KB Output is correct
13 Correct 11 ms 896 KB Output is correct
14 Correct 11 ms 896 KB Output is correct
15 Correct 11 ms 896 KB Output is correct
16 Correct 10 ms 896 KB Output is correct

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 42 ms 6548 KB Output is correct
2 Correct 43 ms 6300 KB Output is correct
3 Correct 43 ms 7408 KB Output is correct
4 Correct 12 ms 1024 KB Output is correct
5 Correct 10 ms 768 KB Output is correct
6 Correct 10 ms 768 KB Output is correct
7 Correct 9 ms 768 KB Output is correct
8 Correct 1 ms 640 KB Output is correct
9 Correct 43 ms 7536 KB Output is correct
10 Correct 43 ms 7656 KB Output is correct
11 Correct 42 ms 7572 KB Output is correct
12 Correct 42 ms 7544 KB Output is correct
13 Correct 43 ms 7544 KB Output is correct
14 Correct 42 ms 8212 KB Output is correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 768 KB Output is correct
2 Correct 9 ms 768 KB Output is correct
3 Correct 31 ms 5360 KB Output is correct
4 Correct 9 ms 768 KB Output is correct
5 Correct 36 ms 6256 KB Output is correct
6 Correct 1 ms 640 KB Output is correct
7 Correct 1 ms 640 KB Output is correct
8 Correct 38 ms 6256 KB Output is correct
9 Correct 37 ms 6420 KB Output is correct
10 Correct 37 ms 6296 KB Output is correct
11 Correct 37 ms 6452 KB Output is correct
12 Correct 38 ms 6768 KB Output is correct
13 Correct 1 ms 640 KB Output is correct
14 Correct 1 ms 640 KB Output is correct
15 Correct 1 ms 640 KB Output is correct
16 Correct 1 ms 640 KB Output is correct
17 Correct 1 ms 640 KB Output is correct
18 Correct 1 ms 640 KB Output is correct
19 Correct 38 ms 6640 KB Output is correct
20 Correct 37 ms 6392 KB Output is correct
21 Correct 38 ms 6252 KB Output is correct
22 Correct 38 ms 6640 KB Output is correct

Subtask #4
63.0 / 63.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 768 KB Output is correct
2 Correct 9 ms 768 KB Output is correct
3 Correct 11 ms 768 KB Output is correct
4 Correct 11 ms 768 KB Output is correct
5 Correct 1 ms 768 KB Output is correct
6 Correct 9 ms 768 KB Output is correct
7 Correct 1 ms 640 KB Output is correct
8 Correct 1 ms 640 KB Output is correct
9 Correct 1 ms 760 KB Output is correct
10 Correct 18 ms 768 KB Output is correct
11 Correct 28 ms 896 KB Output is correct
12 Correct 13 ms 896 KB Output is correct
13 Correct 11 ms 896 KB Output is correct
14 Correct 11 ms 896 KB Output is correct
15 Correct 11 ms 896 KB Output is correct
16 Correct 10 ms 896 KB Output is correct
17 Correct 42 ms 6548 KB Output is correct
18 Correct 43 ms 6300 KB Output is correct
19 Correct 43 ms 7408 KB Output is correct
20 Correct 12 ms 1024 KB Output is correct
21 Correct 10 ms 768 KB Output is correct
22 Correct 10 ms 768 KB Output is correct
23 Correct 9 ms 768 KB Output is correct
24 Correct 1 ms 640 KB Output is correct
25 Correct 43 ms 7536 KB Output is correct
26 Correct 43 ms 7656 KB Output is correct
27 Correct 42 ms 7572 KB Output is correct
28 Correct 42 ms 7544 KB Output is correct
29 Correct 43 ms 7544 KB Output is correct
30 Correct 42 ms 8212 KB Output is correct
31 Correct 10 ms 768 KB Output is correct
32 Correct 9 ms 768 KB Output is correct
33 Correct 31 ms 5360 KB Output is correct
34 Correct 9 ms 768 KB Output is correct
35 Correct 36 ms 6256 KB Output is correct
36 Correct 1 ms 640 KB Output is correct
37 Correct 1 ms 640 KB Output is correct
38 Correct 38 ms 6256 KB Output is correct
39 Correct 37 ms 6420 KB Output is correct
40 Correct 37 ms 6296 KB Output is correct
41 Correct 37 ms 6452 KB Output is correct
42 Correct 38 ms 6768 KB Output is correct
43 Correct 1 ms 640 KB Output is correct
44 Correct 1 ms 640 KB Output is correct
45 Correct 1 ms 640 KB Output is correct
46 Correct 1 ms 640 KB Output is correct
47 Correct 1 ms 640 KB Output is correct
48 Correct 1 ms 640 KB Output is correct
49 Correct 38 ms 6640 KB Output is correct
50 Correct 37 ms 6392 KB Output is correct
51 Correct 38 ms 6252 KB Output is correct
52 Correct 38 ms 6640 KB Output is correct
53 Correct 42 ms 7188 KB Output is correct
54 Correct 42 ms 7316 KB Output is correct
55 Correct 42 ms 7408 KB Output is correct
56 Correct 11 ms 896 KB Output is correct
57 Correct 15 ms 896 KB Output is correct
58 Correct 35 ms 6256 KB Output is correct
59 Correct 37 ms 6256 KB Output is correct
60 Correct 36 ms 6256 KB Output is correct
61 Correct 50 ms 6256 KB Output is correct
62 Correct 138 ms 6276 KB Output is correct
63 Correct 279 ms 6276 KB Output is correct
64 Correct 94 ms 6256 KB Output is correct
65 Correct 214 ms 6260 KB Output is correct
66 Correct 402 ms 6256 KB Output is correct
67 Correct 23 ms 6052 KB Output is correct
68 Correct 42 ms 7572 KB Output is correct
69 Correct 43 ms 7700 KB Output is correct
70 Correct 41 ms 7476 KB Output is correct
71 Correct 42 ms 7408 KB Output is correct
72 Correct 42 ms 7476 KB Output is correct
73 Correct 42 ms 7700 KB Output is correct
74 Correct 43 ms 7672 KB Output is correct