#include<stdio.h>
#include<algorithm>
#include<string.h>
#include<vector>
#include<math.h>
#include<stdlib.h>
using namespace std;
const double EPS = 1e-8;
double mat[32][32];
int N,M;
int edge[32][32];
int out[32];
double val[32];
double ed[32];
inline double ab(double x){return x>0?x:-x;}
void gauss(int x,int y,double t)
{
int i;
for(i=0;i<N;i++)mat[x][i]-=t*mat[y][i];
val[x]-=t*val[y];
}
void solve()
{
int i,j;
for(i=0;i<N;i++){
for(j=i+1;j<N;j++){
if(ab(mat[i][j])<EPS)continue;
gauss(j,i,mat[j][i]/mat[j-1][i]);
}
}
for(i=N-1;i>=0;i--){
ed[i]=val[i];
for(j=i+1;j<N;j++){
ed[i]-=mat[i][j]*ed[j];
}
ed[i]/=mat[i][i];
}
printf("%.10f",ed[0]);
}
int main()
{
//freopen("input.txt","r",stdin);
scanf("%d%d",&N,&M);
int i,j;
for(i=1;i<=M;i++){
int x,y,t;
scanf("%d%d%d",&x,&y,&t);
if(!edge[x][y])out[x]++;
edge[x][y]+=t;
val[x]+=t;
}
for(i=0;i<N;i++){mat[i][i]=1;val[i]/=(double)out[i];}
for(i=0;i<N;i++){
for(j=0;j<N;j++){
if(edge[i][j])mat[i][j]=-1.0/out[i];
}
}
solve();
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
0 ms |
1100 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
