простые
#include <iostream>

using namespace std;
int main() {
	int k=0,n,count=0,ii=3,i,j;
	cin>>n;

	do
	{
		for(i = 2;i < ii/2;i++)
		{
			if(ii % i == 0) k++;
		}
		if(k==0)
		{
			ii+=2;
			for(j = 2; j < ii/2; j++)
			{
				if(ii % j == 0) k++;
			}
		}
		if(k==0)
		{
			cout<<ii-2<<" "<<ii<<endl;
			count++;
			ii-=1;
		}
		k=0;
		ii++;
	}while(count < n);
}




вороны
#include <iostream>
using namespace std;
int main()
{
    int a;

    cout<<"VVEDI OT 1 DO 99"<<endl;
    cin>>a;
    if(a<1 || a>99) cout<<"NU TI GLUPIY, TEBE ZOCHEM USLOVIE NAPISALI";
    else if (a>0&& a<10)
    {
    	switch(a)
                {

                    case(1):
                       cout<<"ODNA VORONA ";
                       break;
                    case(2):
                       cout<<"DVE VORONY ";
                       break;
                    case(3):
                       cout<<"TRI VORONI ";
                       break;
                    case(4):
                       cout<<"CHETIRE VORONY ";
                       break;
                    case(5):
                       cout<<"PYAT VORON ";
                       break;
                    case(6):
                       cout<<"SHEST VORON ";
                       break;
                    case(7):
                       cout<<"SEM VORON ";
                       break;
                    case(8):
                       cout<<"VOSEM VORON ";
                       break;
                    case(9):
                       cout<<"DEVAT VORON ";
                       break;
                }
	}
    else if(a>19)
    {
        if(a>9)
        {
            int t = a;
            t/=10;
            switch(t)
                {
                    case(1):
                        if(a==10) cout<<"DESAT VORON";
                        else cout<<"DESAT ";
                       break;
                    case(2):
                        if(a==20) cout<<"DVADZAT? VORON";
                        else cout<<"DVADZAT ";
                       break;
                    case(3):
                        if(a==30) cout<<"TRIDZAT? VORON";
                        else cout<<"TRIDZAT ";
                       break;
                    case(4):
                        if(a==40) cout<<"SOROK? VORON";
                        else cout<<"SOROK ";
                       break;
                    case(5):
                        if(a==50) cout<<"PATDESAT? VORON";
                        else cout<<"PATDESAT ";
                       break;
                    case(6):
                        if(a==60) cout<<"SHESDESAT VORON";
                        else cout<<"SHESDESAT ";
                       break;
                    case(7):
                        if(a==70) cout<<"SEMDESAT VORON";
                        else cout<<"SEMDESAT ";
                       break;
                    case(8):
                        if(a==80) cout<<"VOSEMDESAT VORON";
                        else cout<<"VOSEMDESAT ";
                       break;
                    case(9):
                        if(a==90) cout<<"DEVANOSTA VORON";
                        else cout<<"DEVANOSTO ";
                       break;
                }
        a%=10;
        switch(a)
                {

                    case(1):
                       cout<<"ODNA VORONA ";
                       break;
                    case(2):
                       cout<<"DVE VORONY ";
                       break;
                    case(3):
                       cout<<"TRI VORONI ";
                       break;
                    case(4):
                       cout<<"CHETIRE VORONY ";
                       break;
                    case(5):
                       cout<<"PYAT VORON ";
                       break;
                    case(6):
                       cout<<"SHEST VORON ";
                       break;
                    case(7):
                       cout<<"SEM VORON ";
                       break;
                    case(8):
                       cout<<"VOSEM VORON ";
                       break;
                    case(9):
                       cout<<"DEVAT VORON ";
                       break;
                }
        }

    }
    else
    {
        switch (a)
        {
            case(11):
                cout<<"ODINADZAT VORON";
                break;
            case(12):
                cout<<"DVENADZAT VORON";
                break;
            case(13):
                cout<<"TRINADZAT VORON";
                break;
            case(14):
                cout<<"CHETIRNADZAT VORON";
                break;
            case(15):
                cout<<"PYATNADZAT VORON";
                break;
            case(16):
                cout<<"SHESTNADZAT VORON";
                break;
            case(17):
                cout<<"SEMNADZAT VORON";
                break;
            case(18):
                cout<<"VOSEMNADZAT VORON";
                break;
            case(19):
                cout<<"DEVATNADZAT VORON";
                break;
        }
    }
}


инд
#include <iostream>
#include <cmath>
using namespace std;

// Ñîãëàñíî ãèïîòåçå Ãîëüáàõà, ëþáîå ÷¸òíîå ÷èñëî ìîæåò áûòü ïðåäñòàâëåíî â âèäå ñóììû äâóõ äðóãèõ ïðîñòûõ. Íàïèøèòå ïðîãðàììó ïðîâåðêè ýòîé ãèïîòåçû äëÿ ïåðâûõ 500 ÷èñåë.

int simple(int n)
{
	int x = sqrt(n);
	if (n<2) return 0;
	else if (n<4) return 1;
	else if (n%2==0) return 0;
	for (int i=3; i<=x; i++) if (n%i==0) return 0;
	return 1;
}

void goldbah(int n)
{
	int n1=2,n2=n;
	int k=0,pol = n/2;
	for (int i = n1;i <= pol; i++)
	{
		for(int j = n2; j >= i; j--)
		{
			if(i + j == n && simple(i) && simple(j))
			{
				cout<<n<<" = "<<i<<" + "<<j<<endl;
				k++;
				break;
			}
		}
			if(k>0)
			break;
	}
}


int main()
{
	const int k = 500;
	for (int i = 0;i <= k;i+=2)
	{

		goldbah(i);
	}
	return 0;
}



сдача
#include <iostream>

/* run this program using the console pauser or add your own getch, system("pause") or input loop */
using namespace std;
int main() {
    int a;
    const int cost = 50;
    a = 100-cost;
    cout<<"?????? ? if:"<<endl;
    if (a/50>=0)
    {
        cout<<"50$:"<<a/50<<" ";
        a%=50;
        if (a==0) return 0;

    }
     if(a/25>=0)
    {
        cout<<"25$:"<<a/25<<" ";
        a%=25;
        if (a==0) return 0;
    }
     if(a/10>=0)
    {
        cout<<"10$:"<<a/10<<" ";
        a%=10;
        if (a==0) return 0;
    }
     if(a/5>=0)
    {
        cout<<"5$:"<<a/5<<" ";
        a%=5;
        if (a==0) return 0;
    }
     if(a/1>=0)
    {
        cout<<"1$:"<<a/1<<" ";
        if (a==0) return 0;
    }
    //??? ??????? ???????????? if.
    /*cout<<endl;
    cout<<"?????? 2:"<<endl;
    a = 100-cost;
    ((a/50>0)?cout<<"50$:"<<a/50<<endl:cout<<"");
    a%=50;
    ((a/25>0)?cout<<"25$:"<<a/25<<endl:cout<<"");
    a%=25;
    ((a/10>0)?cout<<"10$:"<<a/10<<endl:cout<<"");
    a%=10;
    ((a/5>0)?cout<<"5$:"<<a/5<<endl:cout<<"");
    a%=5;
    ((a/1>0)?cout<<"1$:"<<a/1<<endl:cout<<"");
    a%=1;
 */
    return 0;
}