delete pics to save space

1.3389.cpp

@@ -0,0 +1,25 @@
+#include<cstdio>
+#include<cmath>
+inline void swap(double &a,double &b) { double t=a; a=b; b=t; }
+const double eps=1E-8;
+double a[110][110];
+int n;
+#define For(i,a,b) for(int i=a;i<=b;i++)
+int main()
+{
+    scanf("%d",&n);
+    For(i,0,n-1) For(j,0,n) scanf("%lf",&a[i][j]);
+    for(int i=0;i<n;i++)
+	{
+        int pos=i;
+        for(int j=i+1;j<n;j++) if(fabs(a[pos][i])<fabs(a[i][j])) pos=j;
+        for(int j=0;j<=n;j++) swap(a[i][j],a[pos][j]);
+        if(fabs(a[i][i])<=eps) return printf("No Solution\n"),0;
+        for(int j=i+1;j<=n;j++) a[i][j]/=a[i][i];
+        for(int j=0;j<n;j++)
+            if(i!=j)
+                for(int k=i+1;k<=n;k++) a[j][k]-=a[j][i]*a[i][k];
+    }
+    for(int i=0;i<n;i++) printf("%.2lf\n",a[i][n]);
+    return 0;
+}