Submission #3665

#	Time	Username	Problem	Language	Result	Execution time	Memory
3665		cki86201	Following Flow (kriii1_F)	C++98	0 / 1	96 ms	1100 KiB

F

#include<stdio.h>
#include<vector>
#include<time.h>
struct edge{
	int st,en,len;
};
edge data[1005];
long double t[2][35],p[2][35];
long double cnt[35];
int n,m;

int main()
{
	long double ans=0;
	int s=0, e=1, ct=0;
	scanf("%d%d",&n,&m);
	for(int i=0;i<m;i++){
		scanf("%d%d%d",&data[i].st,&data[i].en,&data[i].len);
		cnt[data[i].st]++;
	}
	p[s][0]=1;
	while(++ct<5000){
		for(int i=0;i<=n;i++)p[e][i]=t[e][i]=0;
		for(int i=0;i<m;i++){
			p[e][data[i].en]+=p[s][data[i].st]/cnt[data[i].st];
			t[e][data[i].en]+=(t[s][data[i].st]+data[i].len*p[s][data[i].st])/cnt[data[i].st];
		}
		ans+=t[e][n];
		s=!s; e=!e;
	}
	printf("%.9llf",ans);
}

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