Submission #806706

#	Time	Username	Problem	Language	Result	Execution time	Memory
806706		PixelCat	비스킷 담기 (IOI20_biscuits)	C++14	100 / 100	88 ms	1324 KiB

biscuits

#include "biscuits.h"
 
#ifdef NYAOWO
#include "grader.cpp"
#endif
 
#include <bits/stdc++.h>
#define For(i, a, b) for(int i = a; i <= b; i++)
#define Forr(i, a, b) for(int i = a; i >= b; i--)
#define F first
#define S second
#define all(x) x.begin(), x.end()
#define sz(x) ((int)x.size())
#define eb emplace_back
#define int LL
using namespace std;
using i32 = int32_t;
using LL = long long;
using pii = pair<int, int>;
 
const int MAXK = 60;
 
int a[MAXK + 10];
int val[MAXK + 10];

struct Ayaya {
    int l, r, add;
};

vector<Ayaya> aya;
int eval(int i) {
    int res = 0;
    Forr(it, sz(aya) - 1, 0) {
        auto &ay = aya[it];
        if(ay.l <= i && i <= ay.r) {
            i -= ay.l;
            res += ay.add;
        }
    }
    return res;
}

long long count_tastiness(long long x, std::vector<long long> _a) {
    int k = sz(_a);

    memset(a, 0, sizeof(a));
    memset(val, 0, sizeof(val));
    aya.clear();
    
    For(i, 0, k - 1) {
        a[i] = _a[i];
        val[i] = a[i] << i;
    }
    k = 60;
    For(i, 1, k) {
        val[i] += val[i - 1];
    }

    int lim = val[k] / x;
    aya.push_back({0, 0, val[k]});
    For(i, 0, k - 1) {
        if((1ll << i) > lim) break;
        int hi = aya.back().r + 1;
        int lo = -1;
        while(hi - lo > 1) {
            int mi = (hi + lo) / 2;
            int y = eval(mi);
            if(val[k] - y + (x << i) <= val[i]) lo = mi;
            else hi = mi;
        }
        if(lo >= 0) aya.push_back({aya.back().r + 1, aya.back().r + lo + 1, -(x << i)});
    }
    return aya.back().r + 1;
}
 

• Subtask 1: 9 / 9
• Subtask 2: 12 / 12
• Subtask 3: 21 / 21
• Subtask 4: 35 / 35
• Subtask 5: 23 / 23