Submission #336106

#	Time	Username	Problem	Language	Result	Execution time	Memory
336106		knightron0	Rice Hub (IOI11_ricehub)	C++14	68 / 100	17 ms	1556 KiB

ricehub

#include <bits/stdc++.h>
#include "ricehub.h"
#define pb push_back
 
using namespace std;
const int MOD = 1e9 + 7;
const int MAXN = 1e5 + 5;
 
 
int a[MAXN], pref[MAXN];
int n;
 
 
bool check(int x, int b){
	for(int i= 1;i<=n-x+1;i++){
		vector<int> md;
		if(x & 1){
			md.pb((i + i +x-1)/2);
		} else {
			md.pb((i + i +x-1)/2);
			md.pb(((i + i +x-1)/2)+1);
		}
		for(int m: md){
			int sum1 = pref[m]-pref[i-1];
			sum1 *= -1;
			sum1 += (m-(i-1))*a[m];
			int sum2 = pref[i+x-1]-pref[m];
			sum2 -= (i+x-1-m)*a[m];
			int sum = sum1+sum2;
			if(sum <= b){
				return true;
			}
		}
	}
	return false;
}
 
 
int besthub(int r, int l, int x[], long long b) {
	n = r;
	pref[0] = 0;
	for(int i= 1;i<=n;i++){
		a[i] = x[i-1];
		pref[i] = pref[i-1] + a[i];
	}
	int lo = 1;
    int hi = n;
    while(lo <= hi){
    	int mid = lo+(hi-lo)/2;
    	if(check(mid, b)){
    		lo = mid+1;
    	} else {
    		hi = mid-1;
    	}
    }
    if(!check(lo, b)){
    	return hi;
    }
    return lo;
 
}
 
 
// signed main() {
//     ios_base::sync_with_stdio(false);
//     cin.tie(NULL);
//     #ifndef ONLINE_JUDGE
//     freopen("input.txt", "r", stdin);
//     #endif
//     int m, k;
//     cin>>n>>m>>k;
//   	pref[0] = 0;
//     for(int i=1;i<=n;i++){
//     	cin>>a[i];
//     	pref[i] = pref[i-1] + a[i];
//     }
    
//     return 0;
// }
 
 
 

• Subtask 1: 17 / 17
• Subtask 2: 25 / 25
• Subtask 3: 26 / 26
• Subtask 4: 0 / 32