Submission #361213

#	Time	Username	Problem	Language	Result	Execution time	Memory
361213		HoneyBadger	Olympic Bus (JOI20_ho_t4)	C++17	5 / 100	1094 ms	8556 KiB

ho_t4

#include <iostream>
#include <iomanip>
#include <cstdio>
#include <vector>
#include <bitset>
#include <string>
#include <cstring>
#include <map>
#include <set>
#include <stack>
#include <queue>
#include <deque>
#include <utility>
#include <algorithm>
#include <random>
#include <cmath>
#include <cassert>
#include <climits>
#include <ctime>
#include <chrono>


/*
#pragma GCC optimize("Ofast")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,sse4.1,sse4.2,popcnt,abm,mmx,avx,avx2,tune=native")
*/


#ifdef LOCAL
    #define dbg(x) cout << #x << " : " << x << endl;
#else
    #define dbg(x)
#endif

#define int long long
#define pb push_back
#define ppb pop_back()
#define mp make_pair
#define fi(a, b) for (int i = a; i < b; i++)
#define fj(a, b) for (int j = a; j < b; j++)
#define fk(a, b) for (int k = a; k < b; k++)
#define fi1(a, b) for (int i = a - 1; i >= b; i--)
#define fj1(a, b) for (int j = a - 1; j >= b; j--)
#define fk1(a, b) for (int k = a - 1; k >= b; k--)
#define fx(x, a) for (auto& x : a)
#define rep(i, a, b) for (int i = a; i < b; ++i)
#define rep1(i, a, b) for (int i = a - 1; i >= b; --i)
#define siz(x) (int)x.size()
#define lb lower_bound
#define ub upper_bound
#define all(x) x.begin(), x.end()

using namespace std;

template<typename T1, typename T2>inline void mine(T1 &x, const T2 &y) { if (y < x) x = y; }
template<typename T1, typename T2>inline void maxe(T1 &x, const T2 &y) { if (x < y) x = y; }

ostream& operator << (ostream &out, const vector<int> &b) {
    for (auto k : b) out << k << ' ';
    return out;
}

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef char ch;
typedef string str;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<pii> vpii;
typedef vector<vpii> vvpii;
typedef vector<ch> vch;
typedef vector<vch> vvch;
typedef vector<str> vs;



const int MOD = 1000000007;
const int INF = 1000000050;
const long long BIG = (long long)2e18 + 50;
const int MX = 200010;
const double EPS = 1e-9;


mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

int n, m;
vi g[MX];
int c[MX];
int from[MX];
int to[MX];
int dist[MX];

int dij(int s, int t, int ban) {
	if (ban != -1) {
		g[to[ban]].pb(m);
		from[m] = to[ban];
		to[m] = from[ban];
		c[m] = c[ban];
	}
	fill(dist, dist + n, BIG);
	dist[s] = 0;
	priority_queue<pii> q;
	q.push({0, s});
	while (q.size()) {
		auto[d, v] = q.top();
		q.pop();
		d *= -1;
		if (dist[v] < d) continue;
		fx(id, g[v]) {
			if (id == ban) continue;
			if (dist[to[id]] >  d + c[id]) {
				dist[to[id]] = d + c[id];
				q.push({-dist[to[id]], to[id]});
			}
		}
	}
	if (ban != -1)
		g[to[ban]].ppb;
	return dist[t];
}


int d[MX];

int32_t main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

   
    cin >> n >> m;

    for (int i = 0; i < m; ++i) {
    	int u;
    	cin >> u >> to[i] >> c[i] >> d[i];
    	--u, --to[i];
    	g[u].pb(i);
    	from[i] = u;
	}
	int ans = BIG;
	for (int ban = -1; ban < m; ++ban) {
		int res = dij(0, n - 1, ban) + dij(n - 1, 0, ban);
		if (ban != -1) res += d[ban];
		mine(ans, res);
	}
	cout << (ans == BIG ? -1 : ans) << '\n';
}	

• Subtask 1: 5 / 5
• Subtask 2: 0 / 11
• Subtask 3: 0 / 21
• Subtask 4: 0 / 63