Submission #3111

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
3111	2013-08-25 09:38:42	ainta	Following Flow (kriii1_F)	C++98	1 / 1	0 ms	1108 KiB

F

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#include<stdio.h>
int n,m,deg[31],Ed[1001][3];
double w[31][31],C[31],t,t2;
int main()
{
  int i,a,b,j,k;
  scanf("%d%d",&n,&m);
  for(i=0;i<m;i++){
    scanf("%d%d%d",&Ed[i][0],&Ed[i][1],&Ed[i][2]);
    deg[Ed[i][0]]++;
  }
  for(i=0;i<m;i++){
    a=Ed[i][0],b=Ed[i][1];
    if(b!=n)w[a][b]+=1.0/deg[a];
    C[a]+=1.0*Ed[i][2]/deg[a];
  }
  for(i=n-1;i>0;i--){
    t=1.0/(1.0-w[i][i]);
    w[i][i]=0;
    for(j=i-1;j>=0;j--){
      t2=t*w[j][i];
      w[j][i]=0;
      for(k=i-1;k>=0;k--){
        w[j][k]+=w[i][k]*t2;
      }
      C[j]+=C[i]*t2;
    }
  }
  printf("%.10lf\n",1.0/(1.0-w[0][0])*C[0]);
  return 0;
 
 
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• Subtask 1: 1 / 1