Submission #226406

#	Time	Username	Problem	Language	Result	Execution time	Memory
226406		cfalas	Rice Hub (IOI11_ricehub)	C++14	100 / 100	29 ms	2560 KiB

ricehub

#include<bits/stdc++.h>
using namespace std;
#include "ricehub.h"
#define ll long long
#define MID ((l+r)/2)


int besthub(int n, int rr, int x[], long long b) {
	ll pre[n+1] = {};
	pre[0] = 0;
	for(int i=0;i<n;i++) pre[i+1] = pre[i] + x[i];
	ll ans=0;
	for(int i=0;i<n;i++){
		ll l=i;
		ll r=n-1;
		ll m, mm;
		while(l<=r){
			m = MID;
			ll mid = (i+m)/2;
			//cout<<"mdian: "<<x[mid]<<endl;
			//cout<<"sum before: "<<pre[mid]-pre[i]<<endl;
			ll c = (mid-i) * x[mid] - pre[mid]+pre[i];
			//cout<<"sum after: "<<pre[m+1]-pre[mid+1]<<endl;
			c+= pre[m+1]-pre[mid+1] - (m-mid) * x[mid];
			//cout<<i<< " "<<m<<" "<<c<<endl;
			if(c>b) r = m-1;
			else mm=m, l=m+1;
		}
		ans = max(ans,mm-i+1);
	}
	return ans;
}

Compilation message (stderr)

ricehub.cpp: In function 'int besthub(int, int, int*, long long int)':
ricehub.cpp:29:19: warning: 'mm' may be used uninitialized in this function [-Wmaybe-uninitialized]
   ans = max(ans,mm-i+1);
                 ~~^~

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