Submission #944522

#	Time	Username	Problem	Language	Result	Execution time	Memory
944522		rainboy	제곱근 구하기 2 (gs13068_sqrt2)	C++17	1 / 1	1 ms	420 KiB

sqrt2

#include <math.h>
#include <stdio.h>

long long abs_(long long a) { return a > 0 ? a : -a; }

int main() {
	long long n, r;

	scanf("%lld", &n);
	r = sqrt(n);
	while (abs_(r * r - n) > abs_((r + 1) * (r + 1) - n))
		r++;
	while (abs_(r * r - n) > abs_((r - 1) * (r - 1) - n))
		r--;
	printf("%f\n", (double) r / 2 + (double) n / r / 2);
	return 0;
}

Compilation message (stderr)

sqrt2.cpp: In function 'int main()':
sqrt2.cpp:9:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 |  scanf("%lld", &n);
      |  ~~~~~^~~~~~~~~~~~

• Subtask 1: 1 / 1