oj.uz

답안 #893092

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
893092 2023-12-26T13:44:02 Z presko 홀-짝 수열 (IZhO11_oddeven) C++14
0 / 100
 0 ms 348 KB 
#include<iostream>
#include<bits/stdc++.h>
using namespace std;
long long getseg(long long n)
{
    long long ans=0;
    long long l=1,r=n;//r
    while(r-l>1)
    {
        long long mid=(l+r)>>1;
        long long st,en=mid*(mid+1);
        en>>=1;
        st=en-mid+1;
        if(n<st)r=mid;
        else if(n>st)l=mid;
        else {ans=mid;break;}
    }
    if(ans>0)return ans;
    long long bl,br=l*(l+1);
    br>>=1;
    bl=br-l+1;
    if(bl<=n && n<=br)return l;
    else return r;
}
int main()
{
    long long n;
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cin>>n;
    long long seg=getseg(n);
    long long fin=seg*seg,en=seg*(seg+1);
    en>>=1;
    long long diff=en-n,ans=0;
    diff<<=1;
    ans=fin-diff;
    cout<<ans<<"\n";
}

Subtask #1
0 / 100.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Incorrect 0 ms 348 KB Output isn't correct
8 Halted 0 ms 0 KB -