Submission #521175

#	Time	Username	Problem	Language	Result	Execution time	Memory
521175		Jomnoi	Rice Hub (IOI11_ricehub)	C++17	100 / 100	19 ms	2368 KiB

ricehub

#include <bits/stdc++.h>
#include "ricehub.h"
#define DEBUG 0
using namespace std;

const int N = 1e5 + 10;

int n;
long long lim;
long long x[N];

bool check(int sz) {
    int l = 1, r = sz;
    int mid = (l + r) / 2;

    int sz_l = mid - l, sz_r = r - mid;
    long long L = 0, R = 0;
    for(int i = l; i < mid; i++) {
        L += x[mid] - x[i];
    }
    for(int i = mid + 1; i <= r; i++) {
        R += x[i] - x[mid];
    }

    if(L + R <= lim) {
        return true;
    }
    while(r < n) {
        L -= x[mid] - x[l];
        R -= (x[mid + 1] - x[mid]) * sz_r;
        l++, r++, mid++;
        L += (x[mid] - x[mid - 1]) * sz_l;
        R += x[r] - x[mid];
        if(L + R <= lim) {
            return true;
        }
    }
    return false;
}

int besthub(int R, int L, int X[], long long B) {
    n = R;
    lim = B;
    for(int i = 1; i <= R; i++) {
        x[i] = X[i - 1];
    }

    int l = 1, r = R, pos = -1;
    while(l <= r) {
        int mid = (l + r) / 2;

        if(check(mid) == true) {
            pos = mid;
            l = mid + 1;
        }
        else {
            r = mid - 1;
        }
    }
    return pos;
}

• Subtask 1: 17 / 17
• Subtask 2: 25 / 25
• Subtask 3: 26 / 26
• Subtask 4: 32 / 32