// x и y даны.
(система:)
a*b = x; (1)
a+b = y; (2)

(2)
b = y-a;

(2)=>(1)
a*(y-a) = x;
a*y-sqr(a) = x;
sqr(a) - y*a + x = 0;
D = sqr((-y))-4*x;

A1 = (-y + sqrt(D))/2;
A2 = (-y - sqrt(D))/2;
B1 = y-A1;
B2 = y-A2;

func s p = [(x, y) | x <- [0..s], y <- [0..s], x + y == s, x * y == p]

#include <windows.h>
#include <iostream>

int mesta[50];
int mesto;

int main()
{
  for (int i=0;i<50;i++)
  mesta[i]=rand()%2;

  std::cin>>mesto;

  if (mesta[mesto]==1) printf("mesto zanato!\n"); else printf("mesto svobodno!\n");

  system("pause"); //для того что бы увидеть ответ

  return 0;
}

#include <iostream>   

using namespace std;

int mesta[50];   
int mesto;   

int main()   
{   
    for (int i = 0 ;i < 50; i++)   

    mesta[i]=rand()%2;   

    cin >> mesto;   

    (mesta[mesto]==1) ? cout << "mesto zanato!\n" << endl : cout << "mesto svobodno!\n"<< endl;   

    system("pause"); //для того что бы увидеть ответ   

    return 0;   
}

7
PUSH 1 100
PUSH 1 200
PUSH 2 300
PUSH 2 400
POP 2
POP 1
POP 2

400
200
300

   #include <stdio.h>
   #include <stdlib.h>
   #include <string.h>

   #define PUSH 0
   #define POP  1

   FILE *input;
   FILE *output;

   class stack
   {
        public:
            stack() {_iterator = 10000;}
            void push(int x);
            int pop();
        private:
            int _data[10000];
            int _iterator;
   };
   stack *my_stack;
   struct task
   {
        int _task;
        int _stack_number;
        int _value;
   };
task current_task;
   void stack::push(int x)
   {
        if(_iterator)
        {
            _iterator--;
            _data[_iterator] = x;
        }
   }

   int stack::pop()
   {
        int ret_value;
        if(_iterator < 10000)
        {
            ret_value = _data[_iterator];
            _iterator++;
        }
        return ret_value;
   }

   void get_task(char *str)
   {

        char *p;
        //первая лексема-действие которое необходимо выполнит
        p = strtok(str, " ");
        if(!strcmp(p,"PUSH"))   current_task._task = PUSH;
        else current_task._task = POP;

        //вторая лексема-номер задействованного стека
        p = strtok('\0'," ");
        current_task._stack_number = atoi(p) - 1;

        //третья лексема-значение, которое должно быть записано в стек(если PUSH)
        p = strtok('\0'," ");
        if(current_task._task == PUSH)
        current_task._value = atoi(p);

   }

   void perform_task()
   {
        char buffer[30];
        if(current_task._task == PUSH)
        {
            my_stack[current_task._stack_number].push(current_task._value);
            return;
        }
        else
        {
            itoa(my_stack[current_task._stack_number].pop(),buffer,10);
            fputs(buffer,output);
            fputc('\n',output);
            printf("%s\n",buffer);
        }

   }

   int main()
   {
        int num_of_operations;

        char buffer[30];
        input = fopen("input.txt","r");
        output = fopen("output.txt","w");
        //количество операций == количество требуемых(максимально) стеков
        num_of_operations = atoi(fgets(buffer,sizeof(buffer),input));
        my_stack = new stack[num_of_operations];

        while(fgets(buffer,sizeof(buffer),input))
        {
            get_task(buffer);
            perform_task();
        }
        itoa(my_stack[1].pop(),buffer,10);

        return 0;
   }

b1bae136-b6a5-4516-ae7b-66f18dfa10a1
b1bae136-b6a5-4516-ae7b-66f18dfa10a1(24) : error C2380: type(s) preceding 'task' (constructor with return type, or illegal redefinition of current class-name?)
b1bae136-b6a5-4516-ae7b-66f18dfa10a1(35) : error C2274: 'function-style cast' : illegal as right side of '.' operator
b1bae136-b6a5-4516-ae7b-66f18dfa10a1(36) : error C2274: 'function-style cast' : illegal as right side of '.' operator
b1bae136-b6a5-4516-ae7b-66f18dfa10a1(44) : error C2274: 'function-style cast' : illegal as right side of '.' operator
b1bae136-b6a5-4516-ae7b-66f18dfa10a1(70) : error C2084: function 'void get_task(char *)' already has a body
          b1bae136-b6a5-4516-ae7b-66f18dfa10a1(29) : see previous definition of 'get_task'
b1bae136-b6a5-4516-ae7b-66f18dfa10a1(75) : error C2274: 'function-style cast' : illegal as right side of '.' operator
b1bae136-b6a5-4516-ae7b-66f18dfa10a1(76) : error C2274: 'function-style cast' : illegal as right side of '.' operator
b1bae136-b6a5-4516-ae7b-66f18dfa10a1(84) : error C2274: 'function-style cast' : illegal as right side of '.' operator
b1bae136-b6a5-4516-ae7b-66f18dfa10a1(92) : error C2274: 'function-style cast' : illegal as right side of '.' operator
b1bae136-b6a5-4516-ae7b-66f18dfa10a1(120) : error C3861: 'get_task': identifier not found