Submission #525364

#	Time	Username	Problem	Language	Result	Execution time	Memory
525364		Lobo	Robot (JOI21_ho_t4)	C++17	0 / 100	132 ms	37676 KiB

Main

#include<bits/stdc++.h>
using namespace std;

const long long inf = (long long) 1e18 + 10;
const int inf1 = (int) 1e9 + 10;
#define int long long
#define dbl long double
#define endl '\n'
#define sc second
#define fr first
#define mp make_pair
#define pb push_back
#define all(x) x.begin(), x.end()

#define maxn 220000

int n, m, fq[maxn], d[maxn];
vector<pair<int,pair<int,int>>> edg[maxn];
vector<pair<int,int>> g[maxn];

void shp() {
    for(int i = 2; i <= n; i++) {
        d[i] = inf;
    }

    d[1] = 0;
    priority_queue<pair<int,int>> pq;
    pq.push(mp(0,1));

    while(pq.size()) {
        int u = pq.top().sc;
        int dist = -pq.top().fr;
        pq.pop();
        if(dist != d[u]) continue;  
        
        for(auto V : g[u]) {
            int v = V.fr;
            int w = V.sc;

            if(d[v] > d[u] + w) {
                d[v] = d[u] + w;
                pq.push(mp(-d[v],v));
            }
        }
    }
}

void solve() {
    cin >> n >> m;
    for(int i = 0; i < m; i++) {
        int u, v, col, val;
        cin >> u >> v >> col >> val;
        edg[u].pb(mp(v,mp(col,val)));
        edg[v].pb(mp(u,mp(col,val)));
    }

    for(int i = 1; i <= n; i++) {
        for(auto V : edg[i]) {
            fq[V.sc.fr]++;
        }
        for(auto V : edg[i]) {
            int v = V.fr;
            int col = V.sc.fr;
            int val = V.sc.sc;

            if(fq[col] == 1) g[i].pb(mp(v,0));
            else g[i].pb(mp(v,val));
        }
        for(auto V : edg[i]) {
            fq[V.sc.fr]--;
        }
    }

    shp();

    if(d[n] == inf) cout << -1 << endl;
    else cout << d[n] << endl;
}

int32_t main() {
    ios::sync_with_stdio(false); cin.tie(0);

    // freopen("in.in", "r", stdin);
    //freopen("out.out", "w", stdout);
    
    int tt = 1;
    // cin >> tt;
    while(tt--) solve();

}

• Subtask 1: 0 / 34
• Subtask 2: 0 / 24
• Subtask 3: 0 / 42