Submission #9103493


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#include<bits/stdc++.h>
#define rep(i,a,b) for(int i=a;i<b;i++)
#define rrep(i,a,b) for(int i=a;i>=b;i--)
#define fore(i,a) for(auto &i:a)
#define all(x) (x).begin(),(x).end()
//#pragma GCC optimize ("-O3")
using namespace std; void _main(); int main() { cin.tie(0); ios::sync_with_stdio(false); _main(); }
typedef long long ll; const int inf = INT_MAX / 2; const ll infl = 1LL << 60;
template<class T>bool chmax(T& a, const T& b) { if (a < b) { a = b; return 1; } return 0; }
template<class T>bool chmin(T& a, const T& b) { if (b < a) { a = b; return 1; } return 0; }
//---------------------------------------------------------------------------------------------------
/*---------------------------------------------------------------------------------------------------
            ∧_∧
      ∧_∧  (´<_` )  Welcome to My Coding Space!
     ( ´_ゝ`) /  ⌒i     @hamayanhamayan0
    /   \     | |
    /   / ̄ ̄ ̄ ̄/  |
  __(__ニつ/     _/ .| .|____
     \/____/ (u ⊃
---------------------------------------------------------------------------------------------------*/














ll N;
//---------------------------------------------------------------------------------------------------
void _main() {
	cin >> N;

	if (N % 2 == 1) {
		cout << 0 << endl;
		return;
	}
	
	ll ans = N / 10;
	N /= 10;

	ll p5 = 5;
	while (p5 <= N) {
		ans += N / p5;
		p5 = p5 * 5;
	}
	cout << ans << endl;
}





Submission Info

Submission Time
Task E - Double Factorial
User hamayanhamayan
Language C++14 (GCC 5.4.1)
Score 500
Code Size 1616 Byte
Status
Exec Time 1 ms
Memory 256 KB

Judge Result

Set Name Score / Max Score Test Cases
Sample 0 / 0 01.txt, 02.txt, 03.txt
All 500 / 500 01.txt, 02.txt, 03.txt, 11.txt, 12.txt, 13.txt, 14.txt, 15.txt, 16.txt, 17.txt, 18.txt, 19.txt, 20.txt, 21.txt, 22.txt
Case Name Status Exec Time Memory
01.txt 1 ms 256 KB
02.txt 1 ms 256 KB
03.txt 1 ms 256 KB
11.txt 1 ms 256 KB
12.txt 1 ms 256 KB
13.txt 1 ms 256 KB
14.txt 1 ms 256 KB
15.txt 1 ms 256 KB
16.txt 1 ms 256 KB
17.txt 1 ms 256 KB
18.txt 1 ms 256 KB
19.txt 1 ms 256 KB
20.txt 1 ms 256 KB
21.txt 1 ms 256 KB
22.txt 1 ms 256 KB