Задана матрица A(M x M). Сформиовать одномерный массив из произведений элементов строк, в которых первый элемент не равен 0 и сумм элементов тех столбцов, в которых последний элемент не равен 0 — QBasic(Бейсик)

CLS
INPUT "Razmernost kvadratnoy matrici="; m
DIM a(m, m)
RANDOMIZE TIMER
FOR i = 1 TO m
    FOR j = 1 TO m
        a(i, j) = INT(RND * 100) - 50
    NEXT j
NEXT i
FOR i = 1 TO m
    FOR j = 1 TO m
        PRINT a(i, j);
    NEXT j
    PRINT
NEXT i
PRINT
n = 0: r = 0
FOR i = 1 TO m
    IF a(i, 1) <> 0 THEN n = n + 1
NEXT i
FOR j = 1 TO m
    IF a(m, j) <> 0 THEN r = r + 1
NEXT j
DIM p(n): DIM s(r)
k = 0: t = 0
FOR i = 1 TO m
    IF a(i, 1) <> 0 THEN
        k = k + 1
        p(k) = 1
        FOR j = 1 TO m
            p(k) = p(k) * a(i, j)
        NEXT j
    END IF
NEXT i
FOR j = 1 TO m
    IF a(m, j) <> 0 THEN
        t = t + 1
        s(t) = 0
        FOR i = 1 TO m
            s(t) = s(t) + a(i, j)
        NEXT i
    END IF
NEXT j
PRINT "Massiv iz proizv elementov strok"
FOR i = 1 TO n
    PRINT p(i);
NEXT i
PRINT
PRINT "Massiv iz summ elementov stolbcov"
FOR i = 1 TO r
    PRINT s(i);
NEXT i