Submission #382725

#	Time	Username	Problem	Language	Result	Execution time	Memory
382725		jainbot27	Dungeon 3 (JOI21_ho_t5)	C++17	0 / 100	129 ms	61744 KiB

Main

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

#define f first
#define s second
#define pb push_back
#define ar array
#define all(x) x.begin(), x.end()
#define siz(x) (int)x.size()

#define FOR(x, y, z) for(int x = (y); x < (z); x++)
#define ROF(x, z, y) for(int x = (y-1); x >= (z); x--)
#define F0R(x, z) FOR(x, 0, z)
#define R0F(x, z) ROF(x, 0, z)
#define trav(x, y) for(auto&x:y)

using ll = long long;
using vi = vector<int>;
using vl = vector<long long>;
using pii = pair<int, int>;
using vpii = vector<pair<int, int>>;

template<class T> inline bool ckmin(T&a, T b) {return b < a ? a = b, 1 : 0;}
template<class T> inline bool ckmax(T&a, T b) {return b > a ? a = b, 1 : 0;}
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

const char nl = '\n';
const int mxN = 1e5 + 10;
const int MOD = 1e9 + 7;
const long long infLL = 1e18;

int n, m;
//vector<ll> d;
ll d[mxN*10];
//vector<vector<pair<int, ll>>> g;
vector<pair<int, ll>> g[mxN*10];
vector<pair<int, pii>> v[mxN];

int32_t main(){
    ios_base::sync_with_stdio(0); cin.tie(0);
    cin >> n >> m;
    F0R(i, m){
        int a, b, c, p; cin >> a >> b >> c >> p;
        a--; b--; 
        v[a].pb({c, {p, b}});
        v[b].pb({c, {p, a}});
    }
    int sz = n-1;
    //g.resize(n);
    //d.resize(n, infLL);
    F0R(i, n){
        if(v[i].empty()) continue;
        sort(all(v[i]));
        for(int l=0, r=0; l<siz(v[i]); l=r){
            ll sum = 0;
            while(r<siz(v[i])&&v[i][l].f==v[i][r].f) sum += v[i][r++].s.f;
            if(r-l==1) g[i].pb({0, v[i][l].s.s});
            else{
                //g.pb({});
                //d.pb(infLL);
                g[i].pb({0, ++sz});
                FOR(j, l, r){
                    pii x = v[i][j].s;
                    g[i].pb(x);
                    g[x.s].pb({0, sz});
                    g[sz].pb({sum-x.f, x.s});
                }
            }
        }
    }
    using F = pair<ll, int>;
    priority_queue<F, vector<F>, greater<F>> pq;
    pq.push({0, 0});
    F0R(i, sz+1) d[i] = infLL;
    d[0] = 0;
    while(!pq.empty()){
        auto T = pq.top(); pq.pop();
        if(d[T.s]!=T.f) continue;
        trav(v, g[T.s]){
            if(ckmin(d[v.s], T.f+v.f)){
                pq.push({T.f+v.f, v.s});
            }
        }
    }
    cout << (d[n-1]==infLL?-1:d[n-1]) << nl;
    return 0;
}

• Subtask 1: 0 / 11
• Subtask 2: 0 / 14
• Subtask 3: 0 / 31
• Subtask 4: 0 / 44