Cod sursa(job #2402657)

Utilizator PredaBossPreda Andrei PredaBoss Data 10 aprilie 2019 21:37:38
Problema Algoritmul lui Gauss Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.6 kb
#include <bits/stdc++.h>
#include<cstdio>
using namespace std;
int n,m,c;
#define verify 0.00000001
double matrix[305][305];
double ind[305];
int main()
{
    freopen("gauss.in","r",stdin);
    freopen("gauss.out","w",stdout);
    scanf("%d%d",&n,&m);
    for(int i=1;i<=n;i++)
        for(int j=1;j<=m+1;j++)
        scanf("%lf",&matrix[i][j]);
        int i=1;
        int j=1;
    while(i<=n && j<=m)
    {
        for(c=i;c<=n;c++)
            if(matrix[c][j]<-verify || matrix[c][j]>verify)
            break;
        if(c==n+1)
        {
            j++;
            continue;
        }
        if(c!=i)
        {
            for(int l=1;l<=m+1;l++)
            {
                double aux=matrix[i][l];
                matrix[i][l]=matrix[c][l];
                matrix[c][l]=aux;
            }
        }
        for(int l=j+1;l<=m+1;l++)
            matrix[i][l]/=matrix[i][j];
        matrix[i][j]=1;
        for(int u=i+1;u<=n;u++)
        {
            for(int l=j+1;l<=m+1;l++)
                matrix[u][l]-=matrix[u][j]*matrix[i][l];
            matrix[u][j]=0;
        }
        i++;
        j++;
    }
    for(int i=n;i>0;i--)
        for(int j=1;j<=m+1;j++)
        if(matrix[i][j]<-verify || matrix[i][j]>verify)
        {
            if(j==m+1)
            {
                printf("Imposibil");
                return 0;
            }
            ind[j]=matrix[i][m+1];
            for(c=j+1;c<=m;c++)
                ind[j]-=matrix[i][c]*ind[c];
            break;
        }
    for(int i=1;i<=m;i++)
        printf("%.8lf ",ind[i]);
    return 0;
}