1 files changed, 60 insertions, 0 deletions
diff --git a/others/volume1/078.pas b/others/volume1/078.pas
new file mode 100644
index 0000000..a202c6a
--- /dev/null
+++ b/others/volume1/078.pas
@@ -0,0 +1,60 @@
+uses clib;
+
+var
+  n, i, j: int16;
+  m: int32 = 0;
+  a, b: array of int16;
+
+procedure sort(l, h: int32);
+  var
+    i, j, k: int32;
+    tmp: int16;
+  begin
+    i := l;
+    j := h;
+    k := (l + h) div 2;
+    repeat
+      while a[i] * b[k] < a[k] * b[i] do
+        inc(i);
+      while a[j] * b[k] > a[k] * b[j] do
+        dec(j);
+      if i <= j then
+        begin
+          tmp := a[i];
+          a[i] := a[j];
+          a[j] := tmp;
+          tmp := b[i];
+          b[i] := b[j];
+          b[j] := tmp;
+          inc(i);
+          dec(j)
+        end
+    until i > j;
+
+    if l < j then
+      sort(l, j);
+    if i < h then
+      sort(i, h)
+  end;
+
+begin
+  readln(n);
+  setlength(a, m);
+  setlength(b, m);
+  for i := 1 to n do
+    for j := 1 to n do
+      if gcd(i, j) = 1 then
+        begin
+          inc(m);
+          setlength(a, m);
+          a[m - 1] := i;
+          setlength(b, m);
+          b[m - 1] := j
+        end;
+  sort(0, m - 1);
+  writeln(m);
+  repeat
+    dec(m);
+    writeln(a[m], ' ', b[m])
+  until m = 0;
+end.