Submission #1093890

#	Time	Username	Problem	Language	Result	Execution time	Memory
1093890		InvMOD	Rice Hub (IOI11_ricehub)	C++14	100 / 100	9 ms	2652 KiB

ricehub

#include<bits/stdc++.h>

using namespace std;

using ll = long long;

template<typename T> bool ckmx(T& a, const T& b){if(a < b) return a = b, true; return false;}

const int N = 1e5+5;

ll n, budget;
ll pref[N];

ll calc(int l, int r){
    int mid = (l+r)>>1;

    ll valMid = pref[mid] - pref[mid-1];
    ll prefixLmid = valMid * (1ll * (mid - l+1)) - (pref[mid] - pref[l-1]);
    ll prefixmidR = (pref[r] - pref[mid]) - valMid * (1ll * (r - mid));

    return prefixLmid + prefixmidR;
}

bool ok(int l, int r){
    return calc(l, r) <= budget;
}

int besthub(int R, int L, int x[], ll B)
{
    n = R, budget = B;
    for(int i = 1; i <= n; i++){
        pref[i] = pref[i-1] + 1ll * x[i-1];
    }

    int pointer = 1, answer = 0;
    for(int i = 1; i <= n; i++){
        while(pointer <= n && ok(i, pointer)) pointer++;
        ckmx(answer, pointer - i);
    }

    return answer;
}

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