Submission #541149

#	Time	Username	Problem	Language	Result	Execution time	Memory
541149		nathanlee726	Olympic Bus (JOI20_ho_t4)	C++14	0 / 100	1080 ms	5128 KiB

ho_t4

//#include<i_am_noob_orz>
#include<bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
using namespace std;
#define ll long long
#define int ll
#define ull unsigned long long
#define pii pair<int,int>
#define X first
#define Y second
#define mod ((ll)1e9+7)
#define pb push_back
#define mp make_pair
#define abs(x) ((x)>0?(x):(-(x)))
#define F(n) Fi(i,n)
#define Fi(i,n) Fl(i,0,n)
#define Fl(i,l,n) for(int i=l;i<n;i++)
#define memres(a) memset(a,0,sizeof(a))
#define all(a) a.begin(),a.end()
#define sz(a) ((int)a.size())
#define ceiling(a,b) (((a)+(b)-1)/(b))
#define endl '\n'
#define bit_count(x) __builtin_popcountll((x))
#define ykh mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
#define jimmy_is_kind false
typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> rbtree;

//#define LOCAL
#ifdef LOCAL
#define bug(...) cerr<<"#"<<__LINE__<<' '<<#__VA_ARGS__<<"- ", _do(__VA_ARGS__)
template<typename T> void _do(T && x) {cerr<<x<<endl;}
template<typename T, typename ...S> void _do(T && x, S&&...y) {cerr<<x<<", "; _do(y...);}
#define IOS()
#else
#define IOS() ios_base::sync_with_stdio(0), cin.tie(0)
#define endl '\n'
#define bug(...)
#endif

int add(int a,int b){return(a+b>=mod?a+b-mod:a+b);}
int sub(int a,int b){return(a<b?a+mod-b:a-b);}
int po(int a,int b){
	if(b==0)return 1;
	if(b==1)return(a%mod);
	int tem=po(a,b/2);
	if(b&1)return(((tem*tem)%mod)*a)%mod;
	else return(tem*tem)%mod;
}
int GCD(int a,int b){
	int x=0;
	int ra,rb;
	while(a&&b){
		if(((a&1)==0)&&((b&1)==0)){
			a>>=1,b>>=1,x++;
		}
		else if((a^b)&1){
			if(a&1)b>>=1;
			else a>>=1;
		}
		else{
			ra=abs(a-b),rb=min(a,b);
			a=ra,b=rb;
		}
	}
	return max(a,b)<<x;
}
int gcd(int a,int b){if(b==0)return a;return gcd(b,a%b);}

int n,m,a[205],aa[205],b[205],c[205],cc[205],d[205];
vector<int> g[205];
vector<pair<pii,pii> > edge;
priority_queue<pii,vector<pii>,greater<pii> >pq;
bool ud[205],ued[50010];

signed main(){
	IOS();
    //freopen("05-01.txt","r",stdin);
	cin>>n>>m;
	F(m){
        int v,u,c,d;
        cin>>v>>u>>c>>d;
        d+=c;
        --u,--v;
        g[u].pb(i);
        g[v].pb(i);
        edge.pb({{v,u},{c,d}});
	}
	F(n)a[i]=b[i]=c[i]=d[i]=1e17;
	memres(ud);
	pq.push({0,-1});
	while(!pq.empty()){
        pii pt=pq.top();pq.pop();
        int p=(pt.Y==-1?0:edge[pt.Y].X.Y);
        if(ud[p])continue;
        ud[p]=1;
        a[p]=pt.X;
        aa[p]=pt.Y;
        if(p==n-1)continue;
        for(int id:g[p]){
            if(edge[id].X.X!=p)continue;
            if(ud[edge[id].X.Y])continue;
            pq.push({pt.X+edge[id].Y.X,id});
        }
	}
	pq.push({0,0});
	memres(ud);
	while(!pq.empty()){
        pii pt=pq.top();pq.pop();
        if(ud[pt.Y])continue;
        ud[pt.Y]=1;
        b[pt.Y]=pt.X;
        if(pt.Y==n-1)continue;
        for(int id:g[pt.Y]){
            if(edge[id].X.Y!=pt.Y)continue;
            if(ud[edge[id].X.X])continue;
            pq.push({pt.X+edge[id].Y.X,edge[id].X.X});
        }
	}
	pq.push({0,-1});
	memres(ud);
	while(!pq.empty()){
        pii pt=pq.top();pq.pop();
        int p=(pt.Y==-1?n-1:edge[pt.Y].X.Y);
        if(ud[p])continue;
        ud[p]=1;
        c[p]=pt.X;
        //bug(p,pt.X);
        cc[p]=pt.Y;
        if(p==0)continue;
        for(int id:g[p]){
            if(edge[id].X.X!=p)continue;
            if(ud[edge[id].X.Y])continue;
            pq.push({pt.X+edge[id].Y.X,id});
        }
	}
	pq.push({0,n-1});
	memres(ud);
	while(!pq.empty()){
        pii pt=pq.top();pq.pop();
        if(ud[pt.Y])continue;
        ud[pt.Y]=1;
        d[pt.Y]=pt.X;
        if(pt.Y==0)continue;
        for(int id:g[pt.Y]){
            if(edge[id].X.Y!=pt.Y)continue;
            if(ud[edge[id].X.X])continue;
            pq.push({pt.X+edge[id].Y.X,edge[id].X.X});
        }
	}
	int ans=a[n-1]+c[0];
	F(n)bug(a[i]);
	F(n)bug(c[i]);
	int p=n-1;
	vector<int> v;
	F(n){
        if(aa[i]!=-1)v.pb(aa[i]);
        if(cc[i]!=-1)v.pb(cc[i]);
	}
	memres(ued);
	bug(ans);
	for(int i:v)ued[i]=1;
	F(sz(edge)){
        if(ued[i])continue;
        pair<pii,pii> tp=edge[i];
        ans=min(ans,a[tp.X.Y]+tp.Y.Y+d[tp.X.X]+c[0]);
        ans=min(ans,a[n-1]+c[tp.X.Y]+tp.Y.Y+b[tp.X.X]);
        bug(i,ans,tp.Y.Y,a[n-1],c[tp.X.Y],b[tp.X.X]);
	}
	for(int i:v){
            Fi(j,n)a[j]=c[j]=1e17;
        memres(ud);
        pq.push({0,0});
        while(!pq.empty()){
            pii pt=pq.top();pq.pop();
            if(ud[pt.Y])continue;
            ud[pt.Y]=1;
            a[pt.Y]=pt.X;
            if(pt.Y==n-1)continue;
            for(int id:g[pt.Y]){
                if(id==i){
                    if(edge[id].X.Y!=pt.Y)continue;
                    if(ud[edge[id].X.X])continue;
                    pq.push({pt.X+edge[id].Y.Y,edge[id].X.X});
                }
                else{
                    if(edge[id].X.X!=pt.Y)continue;
                    if(ud[edge[id].X.Y])continue;
                    pq.push({pt.X+edge[id].Y.X,edge[id].X.Y});
                }
            }
        }
        memres(ud);
        pq.push({a[n-1],n-1});
        while(!pq.empty()){
            pii pt=pq.top();pq.pop();
            if(ud[pt.Y])continue;
            ud[pt.Y]=1;
            c[pt.Y]=pt.X;
            bug(pt.Y,pt.X);
            if(pt.Y==0)continue;
            for(int id:g[pt.Y]){
                if(id==i){
                    if(edge[id].X.Y!=pt.Y)continue;
                    if(ud[edge[id].X.X])continue;
                    pq.push({pt.X+edge[id].Y.Y,edge[id].X.X});
                }
                else{
                    if(edge[id].X.X!=pt.Y)continue;
                    if(ud[edge[id].X.Y])continue;
                    pq.push({pt.X+edge[id].Y.X,edge[id].X.Y});
                }
            }
        }
        ans=min(ans,c[0]);
        //bug(i);
        //Fi(j,n)bug(a[j]);
        //Fi(j,n)bug(c[j]);
	}
	//bug(sz(v));
	cout<<(ans<1e17?ans:-1)<<endl;
	return 0;
}

Compilation message (stderr)

ho_t4.cpp: In function 'int main()':
ho_t4.cpp:155:6: warning: unused variable 'p' [-Wunused-variable]
  155 |  int p=n-1;
      |      ^

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