제출 #675559

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
675559		VodkaInTheJar	비스킷 담기 (IOI20_biscuits)	C++14	0 / 100	13 ms	724 KiB

biscuits

#include <bits/stdc++.h>
#pragma GCC optimize("O3")
#define endl '\n'

using namespace std;

const long double eps = 1e-6;

long long count_tastiness(long long x, vector <long long> a) {
    long double c = 0;
    long long d = 1; 
    long long ans = 1; 
    int sz = (int)a.size(); 
    for (int i = 0; ; i++) {
        c /= 2.0;
        if (i < sz)
            c += (long double)a[i];

        if (c < x - eps && i >= sz)
            break;

        if (c < x - eps) {
            d <<= 1ll;
            continue; 
        }

        //cout << c << "wtf" << endl; 

        long long low = 0, high = d-1;
        while (low < high) {
            long long mid = (low + high + 1) >> 1ll;
            long double res = c - (long double)x / (long double)d * (long double)mid;
            if (res > x + eps || fabs(res - x) < eps)
                low = mid; 

            else 
                high = mid-1;
        }

        ans += low + 1;
        //cout << d << " " << low << " " << c << endl; 
        d <<= 1ll;
    }

    return ans; 
}

/*
int main() {
    long long x, n;
    cin >> x >> n;

    vector <long long> a(n);
    for (int i = 0; i < n; i++)
        cin >> a[i];

    cout << count_tastiness(x, a) << endl;
}
*/

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