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Submission #705423

# Submission time Handle Problem Language Result Execution time Memory
705423 2023-03-04T10:50:50 Z blacktulip Olympic Bus (JOI20_ho_t4) C++17
11 / 100
 35 ms 7740 KB 
#include <bits/stdc++.h>

using namespace std;

typedef long long lo; 
typedef pair< lo,lo > PII;

#define fi first
#define se second
#define int long long
#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)

const lo inf = 100000000000000;
const lo KOK = 100000;
const lo LOG = 30;
const lo li = 205;
const lo mod = 1000000007;

int n,m,k,flag,t,y[50005],z[50005],c[50005],d[50005],dist[li][li],cur1[li],value,yasak[50005],par[li],ekstra1,ekstra2,ekstra3;
int cev;
bool vis[li],yolda[50005],yolda1[50005];
string s;
vector<pair<int,pair<int,int>>> v[li],rv[li];

inline int in(){
    int x;
    scanf("%lld",&x);
    return x;
}

inline void sp(bool cont){
	priority_queue<pair<int,int>> pq;
	pq.push({0,1});
	for(int i=1;i<=n;i++){vis[i]=0;cur1[i]=inf;}
	while(pq.size()){
		int node=pq.top().se;
		int co=-pq.top().fi;
		pq.pop();
		if(vis[node])continue;
		vis[node]=1;
		cur1[node]=co;
		for(auto go:v[node]){
			if(!vis[go.fi] && yasak[go.se.se]==0 && go.se.fi+co<cur1[go.fi]){cur1[go.fi]=go.se.fi+co;par[go.fi]=node;pq.push({-co-go.se.fi,go.fi});}
		}
		if(node==ekstra1){
			if(!vis[ekstra2] && co+ekstra3<cur1[ekstra2]){cur1[ekstra2]=ekstra3+co;pq.push({-co-ekstra3,ekstra2});}
		}
	}
	if(cont){value=cur1[n];return ;}
	if(vis[n]==0)return ;
	int node=n;
	while(node!=1){
		for(auto go:rv[node]){
			if(go.fi==par[node]){node=go.fi;yolda1[go.se.se]=1;break;}
		}
	}
}

inline void sp1(bool cont){
	priority_queue<pair<int,int>> pq;
	pq.push({0,n});
	for(int i=1;i<=n;i++){vis[i]=0;cur1[i]=inf;}
	while(pq.size()){
		int node=pq.top().se;
		int co=-pq.top().fi;
		pq.pop();
		if(vis[node])continue;
		vis[node]=1;
		cur1[node]=co;
		for(auto go:v[node]){
			if(!vis[go.fi] && yasak[go.se.se]==0 && go.se.fi+co<cur1[go.fi]){cur1[go.fi]=go.se.fi+co;par[go.fi]=node;pq.push({-co-go.se.fi,go.fi});}
		}
		if(node==ekstra1){
			if(!vis[ekstra2] && co+ekstra3<cur1[ekstra2]){cur1[ekstra2]=ekstra3+co;pq.push({-co-ekstra3,ekstra2});}
		}
	}
	if(cont){value=cur1[1];return ;}
	if(vis[1]==0)return ;
	int node=1;
	while(node!=n){
		for(auto go:rv[node]){
			if(go.fi==par[node]){node=go.fi;yolda1[go.se.se]=1;break;}
		}
	}
}

int32_t main(void){
    n=in(),m=in();
    FOR{
		for(int j=1;j<=n;j++){dist[i][j]=inf;}
		dist[i][i]=0;
	}
    for(int i=1;i<=m;i++){
		y[i]=in(),z[i]=in(),c[i]=in(),d[i]=in();
		dist[y[i]][z[i]]=min(dist[y[i]][z[i]],c[i]);
		v[y[i]].pb({z[i],{c[i],i}});
		rv[z[i]].pb({y[i],{c[i],i}});
	}
	for(int i=1;i<=n;i++){
		for(int j=1;j<=n;j++){
			for(int jj=1;jj<=n;jj++){
				dist[j][jj]=min(dist[j][jj],dist[j][i]+dist[i][jj]);
			}
		}
	}
	sp(0);
	sp1(0);
	//~ cout<<"**\n";
	cev=min(inf,dist[1][n]+dist[n][1]);
	for(int i=1;i<=m;i++){
		if(yolda[i]==0 && yolda1[i]==0){
			cev=min(cev,dist[1][n]+dist[n][z[i]]+dist[y[i]][1]+d[i]+c[i]);
			cev=min(cev,dist[n][1]+dist[1][z[i]]+dist[y[i]][n]+d[i]+c[i]);
			cev=min(cev,dist[n][z[i]]+c[i]+dist[y[i]][1]+dist[1][z[i]]+dist[y[i]][n]+d[i]+c[i]);
			continue;
		}
		if(yolda[i] && yolda1[i]){
			continue;
		}
		if(yolda[i]){
			yasak[i]=1;
			ekstra1=z[i];
			ekstra2=y[i];
			ekstra3=c[i];
			sp(1);
			yasak[i]=0;
			cev=min(cev,min(dist[n][1],dist[n][z[i]]+dist[y[i]][1]+c[i])+value+d[i]);
			continue;
		}
		ekstra1=z[i];
		ekstra2=y[i];
		ekstra3=c[i];
		yasak[i]=1;
		sp1(1);
		yasak[i]=0;
		cev=min(cev,min(dist[1][n],dist[1][z[i]]+dist[y[i]][n]+c[i])+value+d[i]);
	}
	if(cev>=inf)cev=-1;
	printf("%lld\n",cev);
    return 0;
}

Compilation message

ho_t4.cpp: In function 'long long int in()':
ho_t4.cpp:33:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |     scanf("%lld",&x);
      |     ~~~~~^~~~~~~~~~~

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 724 KB Output is correct
2 Correct 8 ms 676 KB Output is correct
3 Correct 9 ms 724 KB Output is correct
4 Correct 10 ms 792 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 9 ms 596 KB Output is correct
7 Incorrect 0 ms 340 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 35 ms 6736 KB Output is correct
2 Correct 32 ms 7196 KB Output is correct
3 Correct 33 ms 7012 KB Output is correct
4 Correct 10 ms 852 KB Output is correct
5 Correct 10 ms 724 KB Output is correct
6 Correct 12 ms 724 KB Output is correct
7 Correct 9 ms 564 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 32 ms 7220 KB Output is correct
10 Correct 31 ms 7176 KB Output is correct
11 Correct 33 ms 7316 KB Output is correct
12 Correct 34 ms 7232 KB Output is correct
13 Correct 34 ms 6860 KB Output is correct
14 Correct 34 ms 7740 KB Output is correct

Subtask #3
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 724 KB Output is correct
2 Correct 8 ms 596 KB Output is correct
3 Correct 26 ms 5216 KB Output is correct
4 Correct 11 ms 596 KB Output is correct
5 Correct 29 ms 6604 KB Output is correct
6 Incorrect 0 ms 340 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #4
0 / 63.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 724 KB Output is correct
2 Correct 8 ms 676 KB Output is correct
3 Correct 9 ms 724 KB Output is correct
4 Correct 10 ms 792 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 9 ms 596 KB Output is correct
7 Incorrect 0 ms 340 KB Output isn't correct
8 Halted 0 ms 0 KB -