Submission #436895

#	Time	Username	Problem	Language	Result	Execution time	Memory
436895		kevinxiehk	Rice Hub (IOI11_ricehub)	C++17	100 / 100	20 ms	3276 KiB

ricehub

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

ll psum[100005];
ll sm[100005];
ll b;
int r;
ll range(int r, int l) {
    return psum[r] - psum[l - 1];
}
bool one(int k) {
    if(k == 1) return true;
    for(int i = 1; i + k - 1 <= r; i++) {
        int m = i + k / 2;
        ll lef = m - i;
        ll rig = k - lef;
        ll sum = (sm[m] * lef - range(m - 1, i)) + (range(i + k - 1, m) - sm[m] * rig);
        if(sum <= b) return true;
    }
    return false;
}
int besthub(int R, int L, int x[], ll B) {
    b = B; r = R;
    for(int i = 1; i <= r; i++) {
        psum[i] = psum[i - 1] + x[i - 1];
        sm[i] = x[i - 1];
        //cerr << psum[i] << '\n';
    }
    int l = 1, rr = r;
    while(l < rr) {
        int m = (l + rr + 1) / 2;
        if(one(m)) l = m;
        else rr = m - 1; 
    }
    return l;
}

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