mirror of
https://github.com/Kiritow/OJ-Problems-Source.git
synced 2024-03-22 13:11:29 +08:00
53 lines
1.2 KiB
C++
53 lines
1.2 KiB
C++
#include<cstdio>
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#include<algorithm>
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#include<cmath>
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using namespace std;
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double a[105][205],b[105],ans;
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int main()
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{
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int n,q,m;
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while(scanf("%d%d",&n,&q)!=EOF)
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{
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m=2*n;
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for(int i=1;i<=n;i++)
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for(int j=1;j<=n;j++)
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{
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scanf("%lf",&a[i][j]);
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if(i==j)
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a[i][n+j]=1;
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else
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a[i][n+j]=0;
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}
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for(int i=1;i<=n;i++)
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{
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int pos=i;
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for(;pos<=n;pos++)
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if(fabs(a[pos][i])>1e-6)break;
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if(pos!=i)
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for(int k=i;k<=m;k++)
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swap(a[i][k],a[pos][k]);
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double temp=a[i][i];
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for(int j=i;j<=m;j++)a[i][j]/=temp;
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for(int j=1;j<=n;j++)
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{
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if(j==i)continue;
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temp=a[j][i];
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for(int k=i;k<=m;k++)
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a[j][k]-=a[i][k]*temp;
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}
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}
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while(q--)
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{
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for(int i=1;i<=n;i++)
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scanf("%lf",&b[i]);
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for(int i=1;i<=n;i++)
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{
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ans=0;
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for(int j=n+1;j<=m;j++)
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ans+=a[i][j]*b[j-n];
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printf("%.2f%c",ans,i==n?'\n':' ');
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}
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}
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}
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}
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