Submission #885959

#	Time	Username	Problem	Language	Result	Execution time	Memory
885959		karimov	Odd-even (IZhO11_oddeven)	C++17	0 / 100	0 ms	348 KiB

oddeven

#include <bits/stdc++.h>
using namespace std;
#define FAST ios_base::sync_with_stdio(false); cin.tie(NULL);
#define fio(x) freopen(x".in","r",stdin);freopen(x".out","w",stdout)
void YES(bool t=1){std::cout<<(t?"YES\n":"NO\n");}
void NO(bool t=1){YES(!t);}
const int MOD = 1000000007;
//#define int long long
#define pb push_back
#define ll long long
#define all(x) (x).begin(), (x).end()

/*
   |------------------------------------|
   |1  2  3  4  5  6  7   8   9   10  11|
   |------------------------------------|
   |1, 2, 4, 5, 7, 9, 10, 12, 14, 16, 17|
   |------------------------------------|
	
	1: 1
	2: 2
	3: 2
	4: 3
	5: 3
	6: 3
	7: 4
    8: 4
    9: 4
    10: 4
    11: 5 17
    12: 5 19
    13: 5 21
    14: 5 23
    15: 5 25
    1
	2 4 
	5 7 9
	10 12 14 16
	17 19 21 23 25
    26 28 30 32 34 36 
    37 39 41 43 45 47 49
    50 52 54 56 58 60 62 64
    65
    
    ODD: 4*n^2 + 1
    EVEN: 4*n^2 + 4*n + 2
    
   1 5 17 37
*/

void solve() {
	double n;cin>>n;
	int x = ceil((ceil(sqrt(n*8+1))-1)/2);
	// cout << "x: "<<x << endl;
	if(x%2==1){
		int d = (x+1)/2-1;
		// cout << "d: "<<d << endl;
		// cout << "f: "<<(d*d*4+1)<<endl;
		x--;
		cout << (d*d*4+1)+(2*(n-(x*(x+1)/2)-1))<<endl;
	} else {
		int d = x/2-1;
		// cout << "d: "<<d << endl;
		// cout << "f: "<<(d*d*4+1)<<endl;
		x--;
		cout << (d*d*4+4*d+2)+(2*(n-(x*(x+1)/2)-1))<<endl;
	}
	// cout << x<<endl;                                                                                     
}

int main() {
	FAST
	solve();
	return 0;
}

• Subtask 1: 0 / 100