delete pics to save space

1.4783.cpp

@@ -0,0 +1,51 @@
+#include<cstdio>
+#include<algorithm>
+#include<cassert>
+using namespace std;
+#define For(i,a,b) for(int i=(a);i<=(b);++i)
+typedef long long LL;
+const int maxn=405;
+const LL mod=1e9+7;
+inline LL ksm(LL a,LL b)
+{
+	LL res=1;
+	for(;b;b>>=1,a=a*a%mod) if(b&1) res=res*a%mod;
+	return res;
+}
+int n,m;
+LL a[maxn][maxn*2];
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	scanf("%d",&n); m=n*2;
+	For(i,1,n)
+	{
+		For(j,1,n) scanf("%lld",&a[i][j]);
+		a[i][i+n]=1;
+	}
+	For(i,1,n)
+	{
+		For(j,i,n)
+			if(a[j][i])
+			{
+				For(k,1,m) swap(a[i][k],a[j][k]);
+				break;
+			}
+		if(!a[i][i]) return puts("No Solution"),0;
+		LL inv=ksm(a[i][i],mod-2);
+		For(j,i,m) a[i][j]=a[i][j]*inv%mod;
+		For(j,1,n) if(i!=j)
+		{
+			LL r=a[j][i];
+			For(k,i,m) a[j][k]=((a[j][k]-r*a[i][k])%mod+mod)%mod;
+		}
+	}
+	For(i,1,n)
+	{
+		For(j,1+n,m) printf("%lld ",a[i][j]);
+		printf("\n");+ 
+	}
+	return 0;
+}