Submission #1274316

#	Time	Username	Problem	Language	Result	Execution time	Memory
1274316		quan606303	Robot (JOI21_ho_t4)	C++20	34 / 100	3097 ms	119040 KiB

Main

/*
 * @Author: RMQuan 
 * @Date: 2025-09-29 22:50:45 
 * @Last Modified by: RMQuan
 * @Last Modified time: 2025-09-30 02:30:55
 */
/*idea : 
*/

#include <bits/stdc++.h>
bool M1;
#define int long long
#define ll long long
#define fi first
#define se second
#define memfull(a,b) memset(a,b,sizeof(a));
#define endl '\n'
#define file(a) freopen(a".inp","r",stdin); freopen(a".out","w",stdout);
using namespace std;
const int MOD=1e9+7;
const int maxn=2e5+7;
const int inf=1e18;

struct canh {
    int u,v,w,col;
};
vector<canh> adj[maxn];
int n,m;

unordered_map<int,long long> dis[maxn];
unordered_map<int,bool> vst[maxn];
unordered_map<int,int> cnt[maxn];
unordered_map<int,long long> psum[maxn];

struct node {
    int u,prev_col,dist;
};
struct cmp {
    bool operator()(const node &x,const node &y)const{
        return x.dist>y.dist;
    }
};

int32_t main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin>>n>>m;
    for (int i=1;i<=m;i++)
    {
        int u,v,col,w;
        cin>>u>>v>>col>>w;
        adj[u].push_back({u,v,w,col});
        adj[v].push_back({v,u,w,col});
        psum[u][col]+=w;
        psum[v][col]+=w;
        cnt[u][col]++;
        cnt[v][col]++;
    }

    priority_queue<node,vector<node>,cmp> q;
    dis[1][-1]=0;
    q.push({1,-1,0});

    while (!q.empty())
    {
        int u=q.top().u;
        int col=q.top().prev_col;
        long long du=q.top().dist;
        q.pop();
        if (vst[u][col]) continue;
        vst[u][col]=true;

        if (col==-1)
        {
            for (auto &e:adj[u])
            {
                int v=e.v, c=e.col, w=e.w;
                if (cnt[u][c]<=1)
                {
                    if (!dis[v].count(-1) || dis[v][-1]>du)
                    {
                        dis[v][-1]=du;
                        q.push({v,-1,du});
                    }
                }
                else
                {
                    if (!dis[v].count(c) || dis[v][c]>du)
                    {
                        dis[v][c]=du;
                        q.push({v,c,du});
                    }
                    if (!dis[v].count(-1) || dis[v][-1]>du+w)
                    {
                        dis[v][-1]=du+w;
                        q.push({v,-1,dis[v][-1]});
                    }
                    if (!dis[v].count(-1) || dis[v][-1]>du+psum[u][c]-w)
                    {
                        dis[v][-1]=du+psum[u][c]-w;
                        q.push({v,-1,dis[v][-1]});
                    }
                }
            }
        }
        else
        {
            for (auto &e:adj[u])
            {
                int v=e.v,c=e.col,w=e.w;
                if (c==col)
                {
                    long long cost=du+psum[u][c]-w;
                    if (!dis[v].count(-1) || dis[v][-1]>cost)
                    {
                        dis[v][-1]=cost;
                        q.push({v,-1,cost});
                    }
                }
            }
        }
    }

    cout<<(dis[n].count(-1)?dis[n][-1]:-1);

    bool M2;
    cerr<<"-------------------------------------------------"<<endl;
    cerr<<"Time : "<<clock()<<" ms"<<endl;
    cerr<<"Memory : "<<abs(&M2-&M1)/1024/1024<<" MB"<<endl;
    cerr<<"-------------------------------------------------"<<endl;
    return 0;
}

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