제출 #3806

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
3806		qja0950	Following Flow (kriii1_F)	C++98	0 / 1	400 ms	1220 KiB

F

#include <stdio.h>
#include <vector>
using namespace std;

typedef pair<int,int> P;

vector<P> line[32];

int n, m;
//int line[34][34][3];
int x, y, z, cnt, now, how;
double plus[54][34], ans=0;
int times;
int main() {
//	freopen("input.txt", "r", stdin);
	scanf("%d %d", &n, &m);
	int i, j;
P temp;
	for(i=1; i<=m; i++) {
		scanf("%d %d %d", &x, &y, &z);
		
		temp.first=y;temp.second=z;
		line[x].push_back(temp);
/*
		line[x][0][0]++;
		line[x][line[x][0][0]][0]=y;
		line[x][line[x][0][0]][1]=z;
*/
	}
	plus[0][0]=1;
	while(times<=99999) {
		for(i=0; i<n; i++) {
			how=line[i].size();
			if(how==0 || plus[times%51][i]==0) continue;
			for(j=0; j<how; j++) {
				plus[(times+line[i][j].second)%51][line[i][j].first]+=((double)1/(double)how)*plus[times%51][i];
			}
			plus[times%51][i]=0;
		}
		if(plus[times%51][n]!=0) {
			ans+=(plus[times%51][n]*(double)times);
			plus[times%51][n]=0;
		}
		times++;
	}
	printf("%.9lf\n", ans);
	return 0;
}

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