我真不会啊，能发一下吗

Question

Answer 1

#include <stdio.h>
#include <math.h>
int main()
{
    float a, b;
    scanf("%f %f", &a, &b);
    if (fabs(sqrt(a * a + b *b )) - 1 < 1e-3)
        printf("%Y\n");
    else
        printf("N\n");
    return 0;
}