Just prepare the equation as described and solve for c=x,

display_sum + k - (entered_sum + x) == (n + 1) * 2;
display_sum + k - entered_sum - x = 2 * n + 2;
x = -2 * n - 2 + display_sum + k - entered_sum;

if x < 0 then Big Bang!

n,k = map(int, input().split())
kol = 0
u = 1
for i in range(n):
    a, b = map(int, input().split())
    if a - b == 2:
        kol += u
    else: u = 0
if kol == 0:
    print('Big Bang!')
else: print(kol)

Определим переменную difference
Затем для каждого элемента истории прибавляем к difference разницу между
числом с компьютера - 2 и введённым числом

В конце проверяем k - 2 + difference, если оно меньше нуля, то мы в пролете, иначе вывести число

#include <iostream>

using namespace std;

int main()
{
        int n, k;
        int i;
        int show, type;
        int showTotal = 0, typeTotal = 0;
        int neededType;

        cin >> n >> k;
        for ( i = 1; i <= n; i++)
        {
                cin >> show >> type;

                if (show - type == 2)
                        showTotal = typeTotal = 0;
                else
                {
                        showTotal += show;
                        typeTotal += type + 2;
                }
        }
        neededType = k + showTotal - typeTotal - 2;
        if (neededType > 0 && neededType < 101)
                cout << neededType << endl;
        else
        {
                cout << "Big Bang!" << endl;
        }
        return 0;
}

thanks

Hey,could you help me?

#include <iostream>

using namespace std;

int main(){
    int n(0),m(0),last(0),temp_f(0),temp_s(0),end_(0);
    cin >> n >> m;
    for(int i = 0;i<n;++i){
        cin >> temp_f >> temp_s;
        last += temp_f-2-temp_s;
    }
    end_ = last + (m - 2);
    if(end_ < 0)cout << "Big Bang!";
    else cout << end_;

    return 0;
}

Why the 2nd sample's answer is Big Bang?

the problem says " Moreover, they check only that the sum of all numbers entered since the last test matches the expected one." Thus should the new number entered in the test to check whether there is a big bang or not? If we have to take into account last input i.e. k value the the problem statement is incorrect. Please could someone explain this.

Please give me some tests for #Wa4 !

"which is less than the number shown on the screen by two" means 1/2 or n-2?

Может ли искомое число быть отрицательным