Submission #1270200

#	Time	Username	Problem	Language	Result	Execution time	Memory
1270200		Born_To_Laugh	Robot (JOI21_ho_t4)	C++17	58 / 100	3093 ms	15880 KiB

Main

// Born_To_Laugh - Hughie Do
#include <bits/stdc++.h>
#define alle(AC) AC.begin(), AC.end()
#define fi first
#define se second
using namespace std;
typedef long long ll;
[[maybe_unused]] const ll MOD = 998244353, INF = 2e18 + 7;
/*
there are two case to deal with:
    - fix the edge of a to elm
    - fix all other edge that have the same col as a-elm edge:
        + move to a with random edge    
        + move to a with the same col edge    
*/
const int maxn = 1e5 + 5;
const int maxm = 2e5 + 5;
int n, m;
vector<array<int, 3>> adj[maxn];
priority_queue<pair<int,int>, vector<pair<int,int>>, greater<>> pq;
vector<ll> dist(maxn, INF);
ll sum[maxm];//sum[i] = sum all p of edge that have col i adjacent to a
ll minn[maxm];//minn[i] = min d[elm] that have c(elm, a) = i
void solve(){
    cin >> n >> m;
    for(int i=1; i<=m; ++i){
        int a, b, c, p;cin >> a >> b >> c >> p;
        adj[a].push_back({b, c, p});
        adj[b].push_back({a, c, p});
    }
    pq.push({0, 1});
    dist[1] = 0;
    while(!pq.empty()){
        int a = pq.top().se;
        int d = pq.top().fi;
        pq.pop();
        if(d > dist[a])continue;

        for(auto &[elm, col, p]: adj[a]){
            sum[col] = 0;
            minn[col] = INF;
        }
        for(auto &[elm, col, p]: adj[a]){
            sum[col] += p;
            minn[col] = min(minn[col], dist[elm]);
        }

        for(auto &[elm, col, p]: adj[a]){
            ll nxt = min({
                dist[a] + p,
                dist[a] + sum[col] - p,
                minn[col] + sum[col] - p
            });
            if(dist[elm] > nxt){
                dist[elm] = nxt;
                pq.push({dist[elm], elm});
            }
        }
    }
    if(dist[n] == INF)cout << -1 << '\n';
    else cout << dist[n] << '\n';
}
signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    solve();
}

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