#include <stdio.h>
#include <math.h>
int main()
{
double x,y; //описание переменных для хранения входных данных
scanf("%lf%lf",&x,&y); //ввод координат точки
if((y>=1) || (x>=-1 && x<=1 && y>=fabs(x))) printf("Belongs"); //проверка
else printf("Doesn't belong");
return 0;
}
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