#include<cstdio>
#include<queue>
#include<vector>
#include<algorithm>
using namespace std;
int v[31][1001];
double dist[31][1001];
int cnt[31];
struct Q{
double per;
double dist;
int pos;
Q(int pos_,double dist_,double per_){
pos = pos_;
dist = dist_;
per = per_;
}
};
double sum=0;
int main(){
double lmt = 0.00000001;
int n, m;scanf("%d %d",&n,&m);
for(int i=0;i<m;i++){
int a, b;
double t;
scanf("%d %d %lf",&a,&b,&t);
v[a][ cnt[a] ] = b;
dist[a][ cnt[a] ] = t;
cnt[a] ++;
}
queue<Q> q;
q.push(Q(0,0,1));
while(q.size()){
Q now = q.front(); q.pop();
if(now.pos== n){
sum += now.dist * now.per;
continue;
}
if(cnt[now.pos] == 0) continue;
double per = now.per / (double)cnt[now.pos];
if( per <= lmt) continue;
for(int i=0;i<cnt[now.pos];i++)
q.push(Q( v[now.pos][i] , now.dist + dist[now.pos][i] , per));
}
printf("%.10lf\n",sum);
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
1600 KB |
Output is correct |
| 2 |
Incorrect |
0 ms |
4260 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
