uses crt;
const nmax=20;
type matr=array[1..nmax,1..nmax] of integer;
function Elem(a:matr;k,n:byte):integer;
var i:byte;
s:integer;
begin
s:=0;
for i:=k to n do
s:=s+a[i,i];
Elem:=s;
end;
var a:matr;
b:array[1..nmax] of integer;
n,i,j,imx:byte;
f,g:text;
mx:integer;
s:string;
begin
clrscr;
randomize;
assign(f,'file1.txt');
rewrite(f);
assign(g,'file2.txt');
rewrite(g);
repeat
write('Размер матрицы до ',nmax,' n=');
readln(n);
until n in [1..nmax];
writeln(f,'Ishodnaya matrica:');
for i:=1 to n do
begin
for j:=1 to n do
begin
a[i,j]:=random(50)-25;
write(f,a[i,j]:5);
end;
writeln(f);
end;
writeln;
close(f);
reset(f);
readln(f,s);
writeln('Исходная матрица:');
for i:=1 to n do
begin
for j:=1 to n do
begin
read(f,a[i,j]);
write(a[i,j]:5);
end;
writeln;
end;
writeln('Вектор последовательных сумм элементов главной диагонали:');
writeln(g,'Vector:');
imx:=0;mx:=a[n,n];
for i:=1 to n do
begin
b[i]:=Elem(a,i,n);
write(b[i],' ');
write(g,b[i],' ');
if b[i]>mx then
begin
mx:=b[i];
imx:=i;
end;
end;
writeln;
writeln(g);
write('Максимальный элемент вектора b[',imx,']=',mx);
write(g,'Maximalnyj element vektora b[',imx,']=',mx);
close(f);
close(g);
readln
end.