Submission #1240116

#	Time	Username	Problem	Language	Result	Execution time	Memory
1240116		Geforgs	Robot (JOI21_ho_t4)	C++20	100 / 100	537 ms	96564 KiB

Main

#include <iostream>
#include <iomanip>
#include <vector>
#include <cmath>
#include <algorithm>
#include <set>
#include <queue>
#include <map>
#include <unordered_map>
#include <stack>
#include <bitset>
#include <string>
#include <cstring>
#include <iterator>
#include <random>
#define ll long long
#define ld long double
#define inf (ll)(2*1e18)
#define sort(a) sort(a.begin(), a.end())
#define reverse(a) reverse(a.begin(), a.end())
#define pb push_back
#define endl "\n"
using namespace std;

void Dijkstra(ll start, vector<vector<pair<ll, ll>>>& a, vector<ll>& dis){
    set<pair<ll, ll>> s;
    s.insert({0, start});
    dis[start] = 0;
    while(!s.empty()){
        auto [val, x] = *s.begin();
        s.erase(s.begin());
        for(auto [y, w]: a[x]){
            if(dis[y] > val + w){
                s.erase({dis[y], y});
                dis[y] = val + w;
                s.insert({dis[y], y});
            }
        }
    }
}

void solve(){
    ll n, m, i, j, x, y, w, c;
    cin>>n>>m;
    vector<vector<pair<ll, ll>>> a(n);
    vector<vector<pair<ll, ll>>> b(n);
    vector<vector<ll>> color(n);
    vector<ll> sums(m);
    map<pair<ll, ll>, ll> change;
    for(i=0;i<m;++i){
        cin>>x>>y>>c>>w;
        --x;
        --y;
        a[x].pb({y, w});
        a[y].pb({x, w});
        color[x].pb(c);
        color[y].pb(c);
    }
    for(i=0;i<n;++i){
        for(j=0;j<a[i].size();++j){
            sums[color[i][j]] += a[i][j].second;
        }
        for(j=0;j<a[i].size();++j){
            if(change.find({i, color[i][j]}) == change.end()){
                change[{i, color[i][j]}] = a.size();
                a.pb(vector<pair<ll, ll>>());
                b.pb(vector<pair<ll, ll>>());
            }
            b[change[{i, color[i][j]}]].pb({a[i][j].first, sums[color[i][j]] - a[i][j].second});
            b[a[i][j].first].pb({change[{i, color[i][j]}], 0});
            a[i][j].second = min(a[i][j].second, sums[color[i][j]] - a[i][j].second);
        }
        for(j=0;j<a[i].size();++j){
            sums[color[i][j]] = 0;
        }
    }
    for(i=0;i<b.size();++i){
        for(auto el: b[i]){
            a[i].pb(el);
        }
    }
    vector<ll> dis(a.size(), inf);
    Dijkstra(0, a, dis);
    if(dis[n-1] == inf){
        cout<<-1<<endl;
    }else{
        cout<<dis[n-1]<<endl;
    }
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    srand(time(nullptr));
    ll t=1;
//    cin>>t;
    for(;t>0;--t){
        solve();
    }
    return 0;
}

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