Как получить цифровую подпись

#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;

}

#include <iostream>

#include<vector>

using namespace std;

int square(int x){

for (int i = 1; i <= 45; ++i){

if (i * i <= x){

continue;

}

return (i - 1) * (i - 1);

}

}

int main()

{

int x, y, xwas, ywas, xywas;

cin >> x >> y;

xwas = square(x);

ywas = square(y);

xywas = square(x + y);

if (xwas + ywas < xywas){

cout << "Petya gives paint to Vasya";

}

else if (xwas + ywas == xywas){

cout << "Equal";

}

else {

cout << "Petya leaves paint to himself";

}

return 0;

}#include <iostream>

#include<vector>

using namespace std;

int square(int x){

for (int i = 1; i <= 45; ++i){

if (i * i <= x){

continue;

}

return (i - 1) * (i - 1);

}

}

int main()

{

int x, y, xwas, ywas, xywas;

cin >> x >> y;

xwas = square(x);

ywas = square(y);

xywas = square(x + y);

if (xwas + ywas < xywas){

cout << "Petya gives paint to Vasya";

}

else if (xwas + ywas == xywas){

cout << "Equal";

}

else {

cout << "Petya leaves paint to himself";

}

return 0;

}

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