Submission #1176421

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Source Code Expand

#include<iostream>
#include<string>
#include<algorithm>
using namespace std;
bool isprime(long long n) {
	if (n == 2)return true;
	if (n % 2 == 0)return false;
	for (int i = 3; i <= sqrt(n); i += 2) if (n%i == 0)return false;
	return true;
}
int main(){
	long long n; cin >> n;
	if (isprime(n))cout << "YES\n"; else cout << "NO\n";
}

Submission Info

Compile Error

./Main.cpp: In function ‘bool isprime(long long int)’:
./Main.cpp:8:29: error: ‘sqrt’ was not declared in this scope
  for (int i = 3; i <= sqrt(n); i += 2) if (n%i == 0)return false;
                             ^