Submission #115284

#	Time	Username	Problem	Language	Result	Execution time	Memory
115284		oolimry	Rice Hub (IOI11_ricehub)	C++14	100 / 100	24 ms	2432 KiB

ricehub

#include "ricehub.h"
#include <bits/stdc++.h>

using namespace std;

int besthub(int R, int L, int X[], long long B)
{
    long long pre[R];
    pre[0] = X[0];
    for(long long i = 1;i < R;i++){
        pre[i] = pre[i-1] + X[i];
    }
    long long ans = 0;


    for(long long i = 0;i < R;i++){
        long long pos = X[i];
        long long low = 0;
        long long high = R;
        while(true){
            if(low == high - 1) break;
            long long s = (low + high) / 2;

            long long l  = i - s;
            long long u = i + s;
            if(l < 0 || u >= R){
                high = s;
                continue;
            }

            long long sum = 0ll;
            sum += pre[i];
            if(l > 0) sum -= pre[l-1];
            sum = (s + 1) * pos - sum;
            sum += pre[u];
            sum -= pre[i];
            sum -= pos * s;
            if(sum > B){
                high = s;
            }
            else{
                low = s;
            }
        }
        ans = max(ans, 2 * low + 1);
        long long l = i - low;
        long long u = i + low;
        long long sum = 0ll;
        sum += pre[i];
        if(l > 0) sum -= pre[l-1];
        sum = (low + 1) * pos - sum;
        sum += pre[u];
        sum -= pre[i];
        sum -= pos * low;
        
        if(l > 0 && sum + abs(pos - X[l-1]) <= B){
            ans = max(ans, 2 * low + 2);
        }
        if(u + 1 < R && sum + abs(pos - X[u+1]) <= B){
            ans = max(ans, 2 * low + 2);
        }
    }
    return ans;
}

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