제출 #390848

#제출 시각아이디문제언어결과실행 시간메모리
390848SavicS쌀 창고 (IOI11_ricehub)C++14
100 / 100
18 ms1872 KiB
#include "ricehub.h"

#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <bits/stdc++.h>

#define fi first
#define se second
#define pb push_back
#define sz(a) (int)a.size()
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define ff(i,a,b) for(int i=a;i<=b;i++)
#define fb(i,b,a) for(int i=b;i>=a;i--)

using namespace std;
using namespace __gnu_pbds;
typedef long long ll;
typedef pair<int,int> pii;
const int maxn = 100005;
const int inf = 1e9 + 5;

template<typename T>
using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

// os.order_of_key(k) the number of elements in the os less than k
// *os.find_by_order(k)  print the k-th smallest number in os(0-based)

int n, m;
ll b;
int niz[maxn];

ll pref[maxn];

bool check(int x) {

    {
        int id = (1 + x) / 2;
        ll zbirL = niz[id] * (id - 1) - pref[id - 1];
        ll zbirR = pref[x] - pref[id] - niz[id] * (x - id);

        if(zbirL + zbirR <= b)return 1;
    }


    ff(i,x + 1, n) {

        int id = (i + i - x + 1) / 2;
        ll zbirL = niz[id] * (id - (i - x + 1)) - (pref[id - 1] - pref[i - x]);
        ll zbirR = pref[i] - pref[id] - niz[id] * (i - id);

        if(zbirL + zbirR <= b)return 1;

    }

    return 0;

}

int besthub(int R, int L, int X[], ll B) {
    n = R, m = L, b = B;
    ff(i,1,n)niz[i] = X[i - 1];

    ff(i,1,n)pref[i] = pref[i - 1] + niz[i];

    int l = 1, r = n, ans = 0;
    while(l <= r) {
        int mid = (l + r) / 2;
        if(check(mid)) {
            l = mid + 1;
            ans = mid;
        } else r = mid - 1;
    }

    return ans;
}

//int main()
//{
//   	ios::sync_with_stdio(false);
//   	cout.tie(nullptr);
//  	cin.tie(nullptr);
//	cin >> n >> m >> b;
//	ff(i,1,n)cin >> niz[i];
//
//	ff(i,1,n)pref[i] = pref[i - 1] + niz[i];
//
//	int l = 1, r = n, ans = 0;
//	while(l <= r){
//		int mid = (l + r) / 2;
//		if(check(mid)){
//			l = mid + 1;
//			ans = mid;
//		}
//		else r = mid - 1;
//	}
//
//	cout << ans << endl;
//
//   	return 0;
//}
///**
//
//5 20 6
//1 2 10 12 14
//
//// probati bojenje sahovski ili slicno
//
//**/


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