oj.uz

Submission #203507

# Submission time Handle Problem Language Result Execution time Memory
203507 2020-02-21T03:52:21 Z abacaba Olympic Bus (JOI20_ho_t4) C++14
100 / 100
 123 ms 4604 KB 
#include<bits/stdc++.h>
using namespace std;

#define int long long

const long long inf=2e13;
const int N=2e2+5;
const int M=5e4+5;

int n,m,a[N];
int d[3][N][N];
int cost[M];
int curd[N],p[N];

vector<int >g[N];
vector<int >path1,path2;

priority_queue<pair<long long,long long>>q;

int is[2][M];

struct edge{
	int u,v,c,d;
	edge(){
		u=v=c=d=0;
	}
};

edge e[M];

void recover(int v,vector<int >&path){
	while(p[v]!=-1){
		path.push_back(p[v]);
		v=e[p[v]].u;
	}
	reverse(path.begin(),path.end());
}

void dxtra(int s){
	fill(curd,curd+N,inf);
	fill(p,p+N,-1);
	q.push(make_pair(0,s));
	curd[s]=0;
	while(!q.empty()){
		int d=-q.top().first,v=q.top().second;
		q.pop();
		if(d>curd[v])
			continue;
		for(int ind:g[v]){
			int to=e[ind].v,w=e[ind].c;
			if(curd[to]>curd[v]+w){
				p[to]=ind;
				curd[to]=curd[v]+w;
				q.push(make_pair(-curd[to],to));
			}
		}
	}
}

void calc_distance(){
	for(int i=0;i<3;++i)
		for(int j=0;j<N;++j)
			for(int k=0;k<N;++k)
				if(j!=k)
					d[i][j][k]=inf;

	for(int i=1;i<=m;++i)
		d[0][e[i].u][e[i].v]=min(d[0][e[i].u][e[i].v],e[i].c);
	for(int k=1;k<=n;++k)
		for(int i=1;i<=n;++i)
			for(int j=1;j<=n;++j)
				d[0][i][j]=min(d[0][i][j],d[0][i][k]+d[0][k][j]);

	for(int t=0;t<2;++t){
		for(int i=1;i<=m;++i)
			if(!is[t][i])
				d[t+1][e[i].u][e[i].v]=min(d[t+1][e[i].u][e[i].v],e[i].c);
		for(int k=1;k<=n;++k)
			for(int i=1;i<=n;++i)
				for(int j=1;j<=n;++j)
					d[t+1][i][j]=min(d[t+1][i][j],d[t+1][i][k]+d[t+1][k][j]);
	}
}

main(){
	cin>>n>>m;
	for(int i=1;i<=m;++i){
		cin>>e[i].u>>e[i].v>>e[i].c>>e[i].d;
		g[e[i].u].push_back(i);
	}

	dxtra(1);
	if(curd[n]!=inf)
		recover(n,path1);

	dxtra(n);
	if(curd[1]!=inf)
		recover(1,path2);

	for(int i=0;i<path1.size();++i)
		is[0][path1[i]]=i+1;
	for(int i=0;i<path2.size();++i)
		is[1][path2[i]]=i+1;

	calc_distance();

	for(int i=1;i<=m;++i){
		int u=e[i].u,v=e[i].v,c=e[i].c;
		if(!is[0][i])
			cost[i]+=min(d[0][1][n],d[0][1][v]+d[0][u][n]+e[i].c);
		else{
			int j=is[0][i]-1;
			int now=inf;
			for(int i=0;i<=j;++i){
				for(int k=j;k<path1.size();++k){
					int u=e[path1[i]].u,v=e[path1[k]].v;
					now=min(now,d[0][1][u]+d[1][u][v]+d[0][v][n]);
				}
			}
			cost[i]+=now;
		}
	}

	for(int i=1;i<=m;++i){
		int u=e[i].u,v=e[i].v,c=e[i].c;
		if(!is[1][i])
			cost[i]+=min(d[0][n][1],d[0][n][v]+d[0][u][1]+e[i].c);
		else{
			int j=is[1][i]-1;
			int now=inf;
			for(int i=0;i<=j;++i)
				for(int k=j;k<path2.size();++k){
					int u=e[path2[i]].u,v=e[path2[k]].v;
					now=min(now,d[0][n][u]+d[2][u][v]+d[0][v][1]);
				}
			cost[i]+=now;
		}
	}

	int ans=d[0][1][n]+d[0][n][1];

	for(int i=1;i<=m;++i)
		ans=min(ans,cost[i]+e[i].d);

	if(ans>=inf)
		cout<<-1<<endl;
	else
		cout<<ans<<endl;
	return 0;
}

Compilation message

ho_t4.cpp:85:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main(){
      ^
ho_t4.cpp: In function 'int main()':
ho_t4.cpp:100:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<path1.size();++i)
              ~^~~~~~~~~~~~~
ho_t4.cpp:102:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<path2.size();++i)
              ~^~~~~~~~~~~~~
ho_t4.cpp:115:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int k=j;k<path1.size();++k){
                 ~^~~~~~~~~~~~~
ho_t4.cpp:108:25: warning: unused variable 'c' [-Wunused-variable]
   int u=e[i].u,v=e[i].v,c=e[i].c;
                         ^
ho_t4.cpp:132:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int k=j;k<path2.size();++k){
                 ~^~~~~~~~~~~~~
ho_t4.cpp:125:25: warning: unused variable 'c' [-Wunused-variable]
   int u=e[i].u,v=e[i].v,c=e[i].c;
                         ^

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 35 ms 2936 KB Output is correct
2 Correct 34 ms 2936 KB Output is correct
3 Correct 35 ms 2936 KB Output is correct
4 Correct 36 ms 2936 KB Output is correct
5 Correct 8 ms 2936 KB Output is correct
6 Correct 35 ms 2936 KB Output is correct
7 Correct 6 ms 2936 KB Output is correct
8 Correct 7 ms 2936 KB Output is correct
9 Correct 8 ms 2940 KB Output is correct
10 Correct 42 ms 2936 KB Output is correct
11 Correct 43 ms 2936 KB Output is correct
12 Correct 42 ms 2936 KB Output is correct
13 Correct 36 ms 2936 KB Output is correct
14 Correct 35 ms 2936 KB Output is correct
15 Correct 35 ms 2936 KB Output is correct
16 Correct 35 ms 2936 KB Output is correct

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 110 ms 3924 KB Output is correct
2 Correct 109 ms 3960 KB Output is correct
3 Correct 121 ms 3964 KB Output is correct
4 Correct 40 ms 3064 KB Output is correct
5 Correct 35 ms 2936 KB Output is correct
6 Correct 35 ms 2936 KB Output is correct
7 Correct 34 ms 2936 KB Output is correct
8 Correct 6 ms 2808 KB Output is correct
9 Correct 118 ms 3960 KB Output is correct
10 Correct 118 ms 3960 KB Output is correct
11 Correct 120 ms 3924 KB Output is correct
12 Correct 118 ms 3960 KB Output is correct
13 Correct 118 ms 3960 KB Output is correct
14 Correct 122 ms 4088 KB Output is correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 35 ms 2936 KB Output is correct
2 Correct 33 ms 2936 KB Output is correct
3 Correct 89 ms 3704 KB Output is correct
4 Correct 35 ms 2936 KB Output is correct
5 Correct 107 ms 3832 KB Output is correct
6 Correct 6 ms 2936 KB Output is correct
7 Correct 6 ms 2936 KB Output is correct
8 Correct 106 ms 3836 KB Output is correct
9 Correct 107 ms 3832 KB Output is correct
10 Correct 107 ms 3960 KB Output is correct
11 Correct 110 ms 3836 KB Output is correct
12 Correct 106 ms 3960 KB Output is correct
13 Correct 6 ms 2936 KB Output is correct
14 Correct 6 ms 2936 KB Output is correct
15 Correct 6 ms 2936 KB Output is correct
16 Correct 6 ms 2936 KB Output is correct
17 Correct 6 ms 2936 KB Output is correct
18 Correct 6 ms 2936 KB Output is correct
19 Correct 107 ms 3960 KB Output is correct
20 Correct 105 ms 3960 KB Output is correct
21 Correct 106 ms 3960 KB Output is correct
22 Correct 107 ms 3964 KB Output is correct

Subtask #4
63.0 / 63.0

# Verdict Execution time Memory Grader output
1 Correct 35 ms 2936 KB Output is correct
2 Correct 34 ms 2936 KB Output is correct
3 Correct 35 ms 2936 KB Output is correct
4 Correct 36 ms 2936 KB Output is correct
5 Correct 8 ms 2936 KB Output is correct
6 Correct 35 ms 2936 KB Output is correct
7 Correct 6 ms 2936 KB Output is correct
8 Correct 7 ms 2936 KB Output is correct
9 Correct 8 ms 2940 KB Output is correct
10 Correct 42 ms 2936 KB Output is correct
11 Correct 43 ms 2936 KB Output is correct
12 Correct 42 ms 2936 KB Output is correct
13 Correct 36 ms 2936 KB Output is correct
14 Correct 35 ms 2936 KB Output is correct
15 Correct 35 ms 2936 KB Output is correct
16 Correct 35 ms 2936 KB Output is correct
17 Correct 110 ms 3924 KB Output is correct
18 Correct 109 ms 3960 KB Output is correct
19 Correct 121 ms 3964 KB Output is correct
20 Correct 40 ms 3064 KB Output is correct
21 Correct 35 ms 2936 KB Output is correct
22 Correct 35 ms 2936 KB Output is correct
23 Correct 34 ms 2936 KB Output is correct
24 Correct 6 ms 2808 KB Output is correct
25 Correct 118 ms 3960 KB Output is correct
26 Correct 118 ms 3960 KB Output is correct
27 Correct 120 ms 3924 KB Output is correct
28 Correct 118 ms 3960 KB Output is correct
29 Correct 118 ms 3960 KB Output is correct
30 Correct 122 ms 4088 KB Output is correct
31 Correct 35 ms 2936 KB Output is correct
32 Correct 33 ms 2936 KB Output is correct
33 Correct 89 ms 3704 KB Output is correct
34 Correct 35 ms 2936 KB Output is correct
35 Correct 107 ms 3832 KB Output is correct
36 Correct 6 ms 2936 KB Output is correct
37 Correct 6 ms 2936 KB Output is correct
38 Correct 106 ms 3836 KB Output is correct
39 Correct 107 ms 3832 KB Output is correct
40 Correct 107 ms 3960 KB Output is correct
41 Correct 110 ms 3836 KB Output is correct
42 Correct 106 ms 3960 KB Output is correct
43 Correct 6 ms 2936 KB Output is correct
44 Correct 6 ms 2936 KB Output is correct
45 Correct 6 ms 2936 KB Output is correct
46 Correct 6 ms 2936 KB Output is correct
47 Correct 6 ms 2936 KB Output is correct
48 Correct 6 ms 2936 KB Output is correct
49 Correct 107 ms 3960 KB Output is correct
50 Correct 105 ms 3960 KB Output is correct
51 Correct 106 ms 3960 KB Output is correct
52 Correct 107 ms 3964 KB Output is correct
53 Correct 115 ms 4032 KB Output is correct
54 Correct 112 ms 3960 KB Output is correct
55 Correct 107 ms 3960 KB Output is correct
56 Correct 35 ms 2936 KB Output is correct
57 Correct 35 ms 2936 KB Output is correct
58 Correct 111 ms 4344 KB Output is correct
59 Correct 105 ms 4176 KB Output is correct
60 Correct 103 ms 4216 KB Output is correct
61 Correct 100 ms 4216 KB Output is correct
62 Correct 103 ms 4344 KB Output is correct
63 Correct 103 ms 4216 KB Output is correct
64 Correct 110 ms 4580 KB Output is correct
65 Correct 109 ms 4604 KB Output is correct
66 Correct 112 ms 4604 KB Output is correct
67 Correct 70 ms 3696 KB Output is correct
68 Correct 120 ms 4020 KB Output is correct
69 Correct 117 ms 3960 KB Output is correct
70 Correct 117 ms 3960 KB Output is correct
71 Correct 121 ms 3960 KB Output is correct
72 Correct 118 ms 3964 KB Output is correct
73 Correct 123 ms 3960 KB Output is correct
74 Correct 118 ms 3960 KB Output is correct