Submission #32223421

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Source Code Expand

#include <bits/stdc++.h>
template<typename T>
inline T chkmin(T& x, const T& y){if (x > y) x = y; return x;}
template<typename T>
inline T chkmax(T& x, const T& y){if (x < y) x = y; return x;}
using namespace std;
int sqr(int x){return x * x;}
const int NN = 2e5 + 500, N = 2e5;
int n, notprime[NN], mu[NN];
vector<int> plist;
inline void linear_sieve(int n)
{
    notprime[1] = true; mu[1] = 1;
    for (int i=2; i<=n; i++)
    {
        if (!notprime[i]){plist.emplace_back(i); mu[i] = -1;}
        for (auto x : plist)
        {
            int now = i*x;
            if (now > n) break;
            notprime[now] = true;
            if (!(i%x)){mu[now] = 0; break;}
            mu[now] = mu[i] * mu[x];
		}
    }
}
int main()
{
	scanf("%d", &n); double ans = 0;
	linear_sieve(n);
	for (int i=1; i<=n; i++)
		if (mu[i]) ans += sqr(sqrt(1.0 * n / i));
	printf("%.0f", ans);
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:29:7: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   29 |  scanf("%d", &n); double ans = 0;
      |  ~~~~~^~~~~~~~~~

Judge Result