Submission #961798

#	Time	Username	Problem	Language	Result	Execution time	Memory
961798		hirayuu_oj	Rice Hub (IOI11_ricehub)	C++17	100 / 100	12 ms	5292 KiB

ricehub

#include "ricehub.h"
#include<bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0; i<(n); i++)
#define all(x) x.begin(),x.end()
using ll=long long;
const ll INF=1LL<<60;

int besthub(int R, int L, int X[], long long B){
    vector<ll> cum(R+1,0);
    vector<ll> x(R);
    rep(i,R){
        x[i]=X[i];
        cum[i+1]=cum[i]+x[i];
    }
    ll ok=1,ng=R+1;
    while(ng-ok>1){
        ll mid=(ok+ng)>>1;
        ll half=mid>>1;
        bool can=0;
        rep(i,R-mid+1){
            ll lf=cum[i+half]-cum[i];
            ll ri=cum[i+mid]-cum[i+half];
            ll rs=0;
            if(mid&1)rs-=x[i+half];
            if(rs+ri-lf<=B){
                can=1;
            }
        }
        if(can)ok=mid;
        else ng=mid;
    }
    return ok;
}

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