Submission #3515

#	Time	Username	Problem	Language	Result	Execution time	Memory
3515		pichulia	Following Flow (kriii1_F)	C++98	0 / 1	0 ms	1304 KiB

F

#include<stdio.h>
#include<time.h>

int n,m;
int a[35][35][3];
int an[35];

double d[3][35][250];
double la;

long start;
long end;

int main(){
	int i,j,k,in1,in2,in3;
	scanf("%d %d",&n,&m);
	for(i=1;i<=m;i++){
		scanf("%d %d %d",&in1,&in2,&in3);
		a[in1][++an[in1]][0]=in2;
		a[in1][an[in1]][1]=in3;
	}
	start = clock();
	d[0][0][0]=1;
	int i1,i2;
	double op;
	for(i=0;i<=25000000;++i){
		i2=0;
		i1=i%200;
		if(i1>=100)
			i2=1,i1-=100;
		if(i1==0){
			for(j=0;j<=n;j++)
				for(k=0;k<=200;++k)
					d[(i2+1)%2][j][k]=0;
		}
		for(j=0;j<n;++j){
			if(an[j]!=0){
				op=d[i2][j][i1]/(double)an[j];
				for(k=an[j];k>=1;--k){
					if(i1+a[j][k][1]>=100)
						d[(i2+1)%2][a[j][k][0]][i1+a[j][k][1]-100]+=op;
					else
						d[i2][a[j][k][0]][i1+a[j][k][1]]+=op;
				}
			}
		}
		la+=d[i2][n][i1]*i;
		end = clock();
		if(end-start>390)
			break;
	}
	printf("%lf",la);
}

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