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Cod sursa(job #998630)
#include <iostream>
#include <iomanip>
#include <fstream>
#include <cstdlib>
#include <cmath>
#define EPS 1e-9
#define DN 305
using namespace std;
ifstream f("gauss.in");
ofstream g("gauss.out");
int n,m;
double s[305][305],x[305];
void elim(double s[DN][DN]) {
for(int i=1,j=1,k;i<=n && j<=m;) {
for(k=i;k<=n; ++k) if(fabs(s[k][j])>EPS) break;
if(k>n) {
++j;
continue;
}
for(int l=1; l<=m+1; ++l) swap(s[i][l],s[k][l]);
for(k=i+1; k<=n; ++k) for(int l=m+1; l>=j; --l)
s[k][l]-=((s[k][j]*s[i][l])/s[i][j]);
++i; ++j;
}
for(int i=n; i;--i) for(int j=1; j<=m+1; ++j) if(fabs(s[i][j])>EPS) {
if(j==m+1) {
g<<"Imposibil";
exit(0);
}
for(int k=j+1; k<=m; ++k) x[j]-=s[i][k]*x[k];
x[j]+=s[i][j];
x[j]/=s[i][j];
break;
}
}
int main()
{
f>>n>>m;
for(int i=1; i<=n; ++i) for(int j=1; j<=m+1; ++j) f>>s[i][j];
elim(s);
for(int i=1; i<=m; ++i) g<<fixed<<setprecision(8)<<x[i]<<' ';
return 0;
}