type
base = record
id: integer;
ball: integer;
end;
var
t: text;
a: array of array of integer;
n: integer;
st, tmp: string;
err: integer := 1;
database: base;
begin
readln(n);
setlength(a, n);
for i: integer := low(a) to high(a) do
setlength(a[i], 2);
for i: integer := low(a) to high(a) do
begin
readln(st);
tmp := st;
delete(tmp, pos(' ', tmp, err), tmp.Length - pos(' ', tmp, err) + 1);
database.id := strtoint(tmp);
tmp := st;
delete(tmp, 1, pos(' ', tmp, err));
database.ball := strtoint(tmp);
a[i, 0] := database.id;
a[i, 1] := database.ball;
end;
var j: integer := 0;
assign(t, 'output.txt');
rewrite(t);
while (j <= high(a)) do
begin
if (j + 1 < high(a)) and (a[j, 1] = a[j + 1, 1]) then
if (a[j, 0] < a[j + 1, 0]) then begin
write(t, inttostr(a[j, 0])); write(t, ' '); write(t, inttostr(a[j, 1])); writeln(t,'');
write(t, inttostr(a[j + 1, 0])); write(t, ' '); write(t, inttostr(a[j + 1, 1])); writeln(t,'');
end else begin
write(t, inttostr(a[j + 1, 0])); write(t, ' '); write(t, inttostr(a[j + 1, 1])); writeln(t,'');
write(t, inttostr(a[j, 0])); write(t, ' '); write(t, inttostr(a[j, 1])); writeln(t,'');
end;
if (j+1=n) then
write(t, inttostr(a[j, 0])); write(t, ' '); write(t, inttostr(a[j, 1])); writeln(t,'');
inc(j, 2);
end;
close(t);
end.
/*Решение с обобщения формула Брахмагупты для произвольного четырехугольника. Функция perimeter(double x[], double y[]) возвращает значение периметра, функция area(double x[], double y[]) возвращает значение площади, пример использования и реализация приведены ниже. */
#include <iostream>
#include <math.h>
double perimeter(double x[], double y[]);
double area(double x[], double y[]);
int main()
{
double x[4], y[4];
std::cout << "Quadrangle ABCD\n";
for (auto i = 0; i < 4; i++)
{
std::cout << "Input coordinates of point " << char(i + 'A') << ": ";
std::cin >> x[i] >> y[i];
}
std::cout << perimeter(x, y) << " " << area(x, y);
return 0;
}
double perimeter(double x[], double y[])
{
double a[4], p = 0;
for (auto i = 0; i < 4; i++)
{
a[i] = sqrt((x[i]-x[(i + 1) % 4]) * (x[i]-x[(i + 1) % 4]) + (y[i]-y[(i + 1) % 4]) * (y[i]-y[(i + 1) % 4]));
p += a[i];
}
return p;
}
double area(double x[], double y[])
{
double a[4], p = 0, s = 1, d[2];
for (auto i = 0; i < 4; i++)
{
a[i] = sqrt((x[i]-x[(i + 1) % 4]) * (x[i]-x[(i + 1) % 4]) + (y[i]-y[(i + 1) % 4]) * (y[i]-y[(i + 1) % 4]));
p += a[i];
}
for (auto i = 0; i < 4; i++)
{
s *= (p / 2- a[i]);
}
for (auto i = 0; i < 2; i++)
{
d[i] = sqrt((x[i]-x[i + 2]) * (x[i]-x[i + 2]) + (y[i]-y[i + 2]) * (y[i]-y[i + 2]));
}
s -= (a[0] * a[2] + a[1] * a[3] + d[0] * d[1]) * (a[0] * a[2] + a[1] * a[3] - d[0] * d[1]) / 4;
s = sqrt(s);
return s;
}
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