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Submission #217114

# Submission time Handle Problem Language Result Execution time Memory
217114 2020-03-29T02:42:52 Z jamielim Olympic Bus (JOI20_ho_t4) C++14
5 / 100
 1000 ms 2552 KB 
#include <bits/stdc++.h>
using namespace std;

int n,m;
vector<pair<pair<int,int>,int> > adj[205];
const long long INF=1000000000000000010LL;
int d[50005];
bool use[50005];

long long f(){
	/*for(int j=0;j<n;j++){
		for(int k=0;k<(int)adj[j].size();k++){
			if(use[adj[j][k].second])printf("%d %d\n",j,adj[j][k].first.first);
		}
	}
	printf(".\n");*/
	priority_queue<pair<long long,int>,vector<pair<long long,int> >,greater<pair<long long,int> > > pq;
	pq.push(make_pair(0,0));
	long long dist1[205];
	for(int i=0;i<n;i++)dist1[i]=INF;
	dist1[0]=0;
	while(!pq.empty()){
		int cur=pq.top().second;pq.pop();
		for(int i=0;i<(int)adj[cur].size();i++){
			if(use[adj[cur][i].second]){
				int a=adj[cur][i].first.first,b=adj[cur][i].first.second;
				if(dist1[a]>dist1[cur]+b){
					dist1[a]=dist1[cur]+b;
					pq.push(make_pair(dist1[a],a));
				}
			}
		}
	}
	pq.push(make_pair(0,n-1));
	long long dist2[205];
	for(int i=0;i<n;i++)dist2[i]=INF;
	dist2[n-1]=0;
	while(!pq.empty()){
		int cur=pq.top().second;pq.pop();
		for(int i=0;i<(int)adj[cur].size();i++){
			if(use[adj[cur][i].second]){
				int a=adj[cur][i].first.first,b=adj[cur][i].first.second;
				if(dist2[a]>dist2[cur]+b){
					dist2[a]=dist2[cur]+b;
					pq.push(make_pair(dist2[a],a));
				}
			}
		}
	}
	return min(INF,dist1[n-1]+dist2[0]);
}

int main(){
	scanf("%d%d",&n,&m);
	int a,b,c;
	for(int i=0;i<m;i++){
		scanf("%d%d%d%d",&a,&b,&c,&d[i]);a--;b--;
		adj[a].push_back(make_pair(make_pair(b,c),i));
	}
	for(int i=0;i<=m;i++)use[i]=1;
	long long ans=f();
	for(int i=0;i<n;i++){
		for(int j=0;j<(int)adj[i].size();j++){
			use[adj[i][j].second]=0;
			pair<pair<int,int>,int > x=adj[i][j];
			x.first.first=i;x.second=m;
			adj[adj[i][j].first.first].push_back(x);
			ans=min(ans,f()+d[adj[i][j].second]);
			use[adj[i][j].second]=1;
			adj[adj[i][j].first.first].pop_back();
		}
	}
	if(ans>=INF)printf("-1");
	else printf("%lld",ans);
}

Compilation message

ho_t4.cpp: In function 'int main()':
ho_t4.cpp:54:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&n,&m);
  ~~~~~^~~~~~~~~~~~~~
ho_t4.cpp:57:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d%d%d",&a,&b,&c,&d[i]);a--;b--;
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 36 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 55 ms 512 KB Output is correct
4 Correct 59 ms 384 KB Output is correct
5 Correct 29 ms 384 KB Output is correct
6 Correct 5 ms 256 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 4 ms 384 KB Output is correct
9 Correct 9 ms 384 KB Output is correct
10 Correct 87 ms 384 KB Output is correct
11 Correct 91 ms 384 KB Output is correct
12 Correct 88 ms 384 KB Output is correct
13 Correct 29 ms 384 KB Output is correct
14 Correct 40 ms 384 KB Output is correct
15 Correct 35 ms 440 KB Output is correct
16 Correct 39 ms 384 KB Output is correct

Subtask #2
0 / 11.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1095 ms 2552 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #3
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 36 ms 384 KB Output is correct
2 Correct 6 ms 384 KB Output is correct
3 Execution timed out 1089 ms 1920 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #4
0 / 63.0

# Verdict Execution time Memory Grader output
1 Correct 36 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 55 ms 512 KB Output is correct
4 Correct 59 ms 384 KB Output is correct
5 Correct 29 ms 384 KB Output is correct
6 Correct 5 ms 256 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 4 ms 384 KB Output is correct
9 Correct 9 ms 384 KB Output is correct
10 Correct 87 ms 384 KB Output is correct
11 Correct 91 ms 384 KB Output is correct
12 Correct 88 ms 384 KB Output is correct
13 Correct 29 ms 384 KB Output is correct
14 Correct 40 ms 384 KB Output is correct
15 Correct 35 ms 440 KB Output is correct
16 Correct 39 ms 384 KB Output is correct
17 Execution timed out 1095 ms 2552 KB Time limit exceeded
18 Halted 0 ms 0 KB -