Submission #535328

#	Time	Username	Problem	Language	Result	Execution time	Memory
535328		Biaz	Olympic Bus (JOI20_ho_t4)	C++17	0 / 100	1093 ms	3636 KiB

ho_t4

#include<bits/stdc++.h>
#define int long long
#define pb push_back
#define ALL(x) x.begin(),x.end()
#define fi first
#define se second
#define ist insert
using namespace std;
int min(int a,int b){return a<b?a:b;}
int max(int a,int b){return a>b?a:b;}
typedef long long ll;
typedef pair<ll,ll> pii;
const int N=205;
const int MOD=1000000007;//998244353
const int INF=1700000000000000000;//2147483647;

int n,m;
struct I{
    int u,v,c,D,id;
} ee[50005];

vector<pii> e[N];
priority_queue<pii,vector<pii>,greater<pii>> pq;
int d[N];
int dij(int s,int t){
    memset(d,0x3f,sizeof(d));
    d[s]=0;
    pq.push({0,s});
    while (pq.size()){
        int v=pq.top().se,w=pq.top().fi;pq.pop();
        if (d[v]<w) continue;
        for (pii i:e[v]) if(d[i.fi]>w+i.se){
            d[i.fi]=w+i.se;
            pq.push({d[i.fi],i.fi});
        }
    }
    return d[t];
}
inline void sol(){
    cin >>n>>m;
    for (int i=0;i<m;i++){
        cin >>ee[i].u>>ee[i].v>>ee[i].c>>ee[i].D;
    }
    int ans=INF;
    for (int kk=0;kk<=m;kk++){
        for (int i=1;i<=n;i++) e[i].clear();
        int cst=0;
        for (int i=0;i<m;i++){
            if (i==kk) e[ee[i].v].pb({ee[i].u,ee[i].c}),cst=ee[i].D;
            else e[ee[i].u].pb({ee[i].v,ee[i].c});
        }
        ans=min(ans,dij(1,n)+dij(n,1)+cst);
    }
    cout <<ans<<'\n';
}
signed main(){
    int _=1;
    //cin >>_;
    while (_--) sol();
    return 0;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 11
• Subtask 3: 0 / 21
• Subtask 4: 0 / 63