Задание:
Даны множества A={1, 2, 3, 4, 5, 6, 7}
и B={3, 5, 8}. Перечислите элементы, образующие множества С, D, E, F (через ",").

#include <iostream>

typedef long long   ll;

using namespace std;

bool ll_is_valid(ll t, ll N, ll x, ll y)

{

return  t / x + (t - x) / y >= N;

}

ll f(ll N, ll x, ll y)

{

   ll R = 1;

   while (!ll_is_valid(R,N,x,y)) R *= 2;

ll L = R / 2;

while(R - L > 1)

{

 ll M   =   (L + R) / 2;

 

 if (!ll_is_valid(M,N,x,y)) {L = M;}

 else {R = M;}

}

return  R;

}

int  main()

{

ll N,x,y;

cin >> N >> x >> y;

if(x > y) swap( x, y );  

cout << f(N, x, y) <<  std::endl;

}

1)

CLS
RANDOMIZE TIMER
INPUT "N = ", N
DIM D%(N)
PRINT "D("; N; "):";
K = 0
FOR i = 1 TO N
    D%(i) = RND * (2 * N + 1) - N
    PRINT " "; D%(i);
NEXT i
PRINT
INPUT "T = ", T
FOR i = 1 TO N
    IF D%(i) = T THEN
       K = K + 1
    END IF
NEXT i
PRINT "K = "; K
END

2)

CLS
RANDOMIZE TIMER
DIM D%(14), C%(14)
PRINT "D(14):";
K = 0
FOR i = 1 TO 14
    D%(i) = RND * 41 - 20
    PRINT " "; D%(i);
    IF D%(i) < 7 THEN
       K = K + 1
       C%(K) = D%(i)
    END IF
NEXT i
PRINT
PRINT "C("; K; "):";
FOR i = 1 TO K
    PRINT " "; C%(i);
NEXT i
END