oj.uz

답안 #314699

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
314699 2020-10-20T22:36:30 Z aZvezda Olympic Bus (JOI20_ho_t4) C++14
0 / 100
 1000 ms 6272 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<ll, ll>, pair<ll, ll> > > edges;
bool off[MAX_W];
vector<pair<pair<ll, ll>, ll> > g[MAX_N];
ll dist[4][MAX_N];
ll 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;
		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;
} 

signed main() {
	ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
	cin >> n >> m;
	edges.resize(m);
	for(ll i = 0; i < m; i ++) {
		cin >> edges[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}); 
	}
	dij(0, 1);
	dij(1, n);
	ll ret = dist[0][n] + dist[1][1];
	for(ll i = 0; i < m; i ++) {
		int u = edges[i].first.first, v = edges[i].first.second, cost = edges[i].second.first;
		if(dist[0][v] + cost + dist[1][u] > dist[0][n] && dist[1][v] + cost + dist[0][u] > dist[1][1]) {continue;}
		off[2 * i] = true;
		off[2 * i + 1] = false;
		dij(2, 1);
		dij(3, n);
		chkmin(ret, edges[i].second.second + dist[2][n] + dist[3][1]);
		off[2 * i] = false;
		off[2 * i + 1] = true;
	}
	if(ret < mod) {
		cout << ret << endl;
	} else {
		cout << -1 << endl;
	}
	return 0;
}

Subtask #1
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 45 ms 512 KB Output is correct
2 Correct 1 ms 384 KB Output is correct
3 Correct 3 ms 512 KB Output is correct
4 Correct 2 ms 512 KB Output is correct
5 Correct 2 ms 512 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 0 ms 384 KB Output is correct
9 Correct 9 ms 512 KB Output is correct
10 Correct 21 ms 512 KB Output is correct
11 Correct 17 ms 512 KB Output is correct
12 Correct 30 ms 632 KB Output is correct
13 Incorrect 14 ms 544 KB Output isn't correct
14 Halted 0 ms 0 KB -

Subtask #2
0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 578 ms 5664 KB Output is correct
2 Incorrect 164 ms 6272 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 21.0

# 결과 실행 시간 메모리 Grader output
1 Correct 44 ms 512 KB Output is correct
2 Correct 1 ms 384 KB Output is correct
3 Execution timed out 1048 ms 4352 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #4
0 / 63.0

# 결과 실행 시간 메모리 Grader output
1 Correct 45 ms 512 KB Output is correct
2 Correct 1 ms 384 KB Output is correct
3 Correct 3 ms 512 KB Output is correct
4 Correct 2 ms 512 KB Output is correct
5 Correct 2 ms 512 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 0 ms 384 KB Output is correct
9 Correct 9 ms 512 KB Output is correct
10 Correct 21 ms 512 KB Output is correct
11 Correct 17 ms 512 KB Output is correct
12 Correct 30 ms 632 KB Output is correct
13 Incorrect 14 ms 544 KB Output isn't correct
14 Halted 0 ms 0 KB -