Submission #604538

#	Time	Username	Problem	Language	Result	Execution time	Memory
604538		rrrr10000	Counting Mushrooms (IOI20_mushrooms)	C++14	0 / 100	2 ms	308 KiB

mushrooms

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef vector<ll> vi;
typedef vector<vi> vvi;
typedef pair<ll,ll> P;
typedef vector<P> vp;
typedef vector<vp> vvp;
typedef vector<bool> vb;
#define rep(i,n) for(ll i=0;i<(ll)(n);i++)
#define REP(i,k,n) for(ll i=(ll)(k);i<(ll)(n);i++)
#define all(a) a.begin(),a.end()
#define fi first
#define se second
#define pb emplace_back
template<class T> void out(T a){cout<<a<<endl;}
#include "mushrooms.h"
int count_mushrooms(int n){
    int ans=1;
    if(n<=226){
        vector<int> ask(2);
        REP(i,1,n){
            ask[1]=i;
            int res=use_machine(ask);
            if(res==0)ans++;
        }
        return ans;
    }
    int B=200;
    vi va,vb;va.pb(0);
    REP(i,1,B){
        vector<int> ask(2);
        ask[1]=i;
        int res=use_machine(ask);
        if(res==0)va.pb(i);
        else vb.pb(i);
    }
    int f=0;
    if(va.size()<vb.size()){
        swap(va,vb);f=1;
    }
    for(ll i=B;i<n;i+=va.size()-1){
        vi al;
        REP(j,i,i+va.size()-1)if(j<n)al.pb(j);
        vector<int> ask(al.size()*2+1);
        rep(j,al.size())ask[j*2+1]=al[j];
        rep(j,al.size()+1)ask[j*2]=va[j];
        int res=use_machine(ask);
        if(f==1)ans+=res/2;
        else ans+=al.size()-res/2;
    }
    return ans;
}

• Subtask 1: 0 / 100