Submission #248629

#	Time	Username	Problem	Language	Result	Execution time	Memory
248629		tleontest1	Olympic Bus (JOI20_ho_t4)	C++17	0 / 100	1084 ms	262148 KiB

ho_t4

#include <bits/stdc++.h>

using namespace std;

typedef long long lo;
typedef pair< lo,lo > PII;
typedef pair< lo,PII > PIII;
typedef pair< lo,PIII > PIIII;
typedef pair< lo,PIIII > PIIIII;
typedef pair< lo,PIIIII > PIIIIII;

#define fi first
#define se second
#define mp make_pair
#define endl "\n"
#define pb push_back
#define fio() ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
#define FOR for(int i=1;i<=n;i++)
#define mid ((start+end)/2)
#define ort ((bas+son)/2)
#define int long long

const lo inf = 1000000000000000000;
const lo KOK = 100000;
const lo LOG = 30;
const lo li = 1005;
const lo mod = 1000000007;

int n,m,k,flag,t,vis[li][50005],vis1[li][50005],yasak,mn,ans1,ans2,cev,d,x,y,z,dp[50005],dp1[50005];
string s;
vector<PIIII> v[li];

//~ inline void sp2(){
	//~ priority_queue<PIIIII> pq;
	//~ pq.push({0,{n,{0,{0,0}}}});
	//~ FOR vis[i][0]=0;
	//~ FOR vis[i][1]=0;
	//~ mn=inf;
	//~ while(pq.size()){
		//~ int co=-pq.top().fi;
		//~ int node=pq.top().se.fi;
		//~ int hak=pq.top().se.se.fi;
		//~ int xx=pq.top().se.se.se.fi;
		//~ int yy=pq.top().se.se.se.se;
		//~ pq.pop();
		//~ if(vis[node][hak])continue;
		//~ vis[node][hak]=1;
		//~ if(node==1)mn=min(mn,co);
		//~ for(int i=0;i<(int)v[node].size();i++){
			//~ int go=v[node][i].fi;
			//~ if(node==xx && go==yy)continue;
			//~ if(v[node][i].se.se==0)pq.push({-co-v[node][i].se.fi,{go,{hak,{xx,yy}}}});
			//~ else{
				//~ if(hak)continue;
				//~ pq.push({-co-v[node][i].se.fi,{go,{1,{go,node}}}});
			//~ }
		//~ }
	//~ }
//~ }

//~ inline void sp3(int xxx,int yyy){
	//~ priority_queue<PIIIII> pq;
	//~ pq.push({0,{n,{1,{xxx,yyy}}}});
	//~ FOR vis[i][0]=0;
	//~ FOR vis[i][1]=0;
	//~ mn=inf;
	//~ while(pq.size()){
		//~ int co=-pq.top().fi;
		//~ int node=pq.top().se.fi;
		//~ int hak=pq.top().se.se.fi;
		//~ int xx=pq.top().se.se.se.fi;
		//~ int yy=pq.top().se.se.se.se;
		//~ pq.pop();
		//~ if(vis[node][hak])continue;
		//~ vis[node][hak]=1;
		//~ if(node==1)mn=min(mn,co);
		//~ cout<<xx<<" : : "<<yy<<endl;
		//~ for(int i=0;i<(int)v[node].size();i++){
			//~ int go=v[node][i].fi;
			//~ if(node==xx && go==yy)continue;
			//~ if(v[node][i].se.se==0)pq.push({-co-v[node][i].se.fi,{go,{hak,{xx,yy}}}});
			//~ else{
				//~ if(hak)continue;
				//~ pq.push({-co-v[node][i].se.fi,{go,{1,{go,node}}}});
			//~ }
		//~ }
	//~ }
//~ }

inline void sp(){
	priority_queue<PIII> pq;
	for(int i=0;i<=m;i++)
	pq.push({0,{1,i}});
	//~ FOR vis[i]=0;
	while(pq.size()){
		int co=-pq.top().fi;
		int node=pq.top().se.fi;
		int ban=pq.top().se.se;
		pq.pop();
		if(vis[node][ban])continue;
		//~ cout<<node<<" : ; "<<ban<<endl;
		vis[node][ban]=1;
		if(node==n)dp[ban]=co;
		for(int i=0;i<(int)v[node].size();i++){
			//~ if(v[node][i].se.se.se==yasak && v[node][i].se.se.fi==0)continue;
			//~ if(v[node][i].se.se.se!=yasak && v[node][i].se.se.fi==1)continue;
			if(ban!=v[node][i].se.se.se && v[node][i].se.se.fi==1)continue;
			if(ban==v[node][i].se.se.se && v[node][i].se.se.fi==0)continue;
			pq.push({-co-v[node][i].se.fi,{v[node][i].fi,ban}});
		}
	}
}

inline void sp1(){
	priority_queue<PIII> pq;
	for(int i=0;i<=m;i++)
	pq.push({0,{n,i}});
	//~ FOR vis[i]=0;
	ans1=-1;
	ans2=-1;
	while(pq.size()){
		int co=-pq.top().fi;
		int node=pq.top().se.fi;
		int ban=pq.top().se.se;
		pq.pop();
		if(vis1[node][ban])continue;
		vis1[node][ban]=1;
		if(node==1)dp1[ban]=co;
		for(int i=0;i<(int)v[node].size();i++){
			//~ if(v[node][i].se.se.se==yasak && v[node][i].se.se.fi==0)continue;
			//~ if(v[node][i].se.se.se!=yasak && v[node][i].se.se.fi==1)continue;
			if(ban!=v[node][i].se.se.se && v[node][i].se.se.fi==1)continue;
			if(ban==v[node][i].se.se.se && v[node][i].se.se.fi==0)continue;
			pq.push({-co-v[node][i].se.fi,{v[node][i].fi,ban}});
		}
	}
}

main(void){
	scanf("%lld %lld",&n,&m);
	for(int i=1;i<=m;i++){
		//~ int z;
		scanf("%lld %lld %lld %lld",&x,&y,&z,&d);
		v[x].pb({y,{z,{0,i}}});
		v[y].pb({x,{z+d,{1,i}}});
	}
	//~ FOR{
		//~ for(int j=1;j<=n;j++)dp[i][j]=inf;
	//~ }
	for(int i=0;i<=m;i++) dp[i]=inf;
	for(int i=0;i<=m;i++) dp1[i]=inf;
	sp();
	sp1();
	int ans=inf;
	//~ cout<<dp[0]<<" : : "<<dp1[0]<<endl;
	//~ FOR dp[i]=min(dp[i],dp[0]);
	//~ FOR dp1[i]=min(dp1[i],dp1[0]);
	for(int i=1;i<=m;i++){
		//~ cout<<dp[i]<<" : : "<<dp1[i]<<endl;
		ans=min(ans,dp[i]+dp1[i]);
		//~ ans=min(ans,dp[i]+dp1[0]);
		//~ ans=min(ans,dp[0]+dp1[i]);
	}
	ans=min(ans,dp[0]+dp1[0]);
	if(ans==inf)ans=-1;
	printf("%lld\n",ans);
	return 0;
}

Compilation message (stderr)

ho_t4.cpp:139:10: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main(void){
          ^
ho_t4.cpp: In function 'int main()':
ho_t4.cpp:140:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld %lld",&n,&m);
  ~~~~~^~~~~~~~~~~~~~~~~~~
ho_t4.cpp:143:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld %lld %lld %lld",&x,&y,&z,&d);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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