Submission #308686

#	Time	Username	Problem	Language	Result	Execution time	Memory
308686		M4mou	Counting Mushrooms (IOI20_mushrooms)	C++17	92.24 / 100	10 ms	384 KiB

mushrooms

#include <bits/stdc++.h>
#include "mushrooms.h"
using namespace std;

#define mp make_pair
#define pb push_back
#define all(x) x.begin(), x.end()
#define fi first
#define se second
#define inf 1000000000
#define sz(x) (ll)x.size()
#define boost ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
typedef long long ll;
typedef unsigned long long ull;
typedef  double ld;
typedef vector<int> vi;
typedef pair<int,int> pii;
typedef pair< int , pii> piii;
typedef pair<int,bool> pib;
typedef vector<pii> vii;
typedef vector<pib> vib;
typedef vector<vi> vvi;
typedef vector<vii> vvii;
typedef vector<string> vs;
typedef vector<ll> vll;
typedef pair<string,string> pss;
typedef vector<pss> vss;
typedef pair<ld , ld> pdd;
typedef vector<ld> vd;
typedef vector<vector<pib>> vvib;
typedef vector<piii> viii;
typedef vector<viii> vviii;
typedef vector<bool> vb;
typedef pair<pii , bool> piib;
typedef vector<pair<pii , bool>> viib;
const int MOD = 1e9 + 7; //998244353;
const int MAXN = 100005;

string test = "AABABABABAA";
/*
int use_machine(vi a){
    int c = 0;
    for(int i = 0 ;i<a.size()-1;i++){
        if(test[a[i]] != test[a[i+1]])c++;
    }
    return c;
}


 */
vi a, b;

int count_mushrooms(int n) {
	if(n < 226){
	    int c = 1;
	    for(int i = 1;i<n;i++){
	        c += 1 - use_machine({0 , i});
	    }
	    return c;
	}
	int k = 140;
	a.pb(0);
	for(int i = 1;i<=2;i++){
	    if(use_machine({0, i}) == 1)b.pb(i);
	    else a.pb(i);
	}
	int co = 3;
	while(co <= k){
	    if(a.size() >= 2){
	        int x = use_machine({a[0], co , a[1] , co + 1});
	        if(x == 0){
	            a.pb(co);
	            a.pb(co+1);
	        }
	        if(x == 1){
	            a.pb(co);
	            b.pb(co+1);
	        }
            if(x == 2){
                b.pb(co);
                a.pb(co+1);
            }
            if(x == 3){
                b.pb(co);
                b.pb(co+1);
            }
	    }
	    else {
            int x = use_machine({b[0], co , b[1] , co + 1});
            if(x == 0){
                b.pb(co);
                b.pb(co+1);
            }
            if(x == 1){
                b.pb(co);
                a.pb(co+1);
            }
            if(x == 2){
                a.pb(co);
                b.pb(co+1);
            }
            if(x == 3){
                a.pb(co);
                a.pb(co+1);
            }
	    }
	    co += 2;
	}
	int score = 0;
	while(co < n){
	    vi query;
	    if(a.size() > b.size()){
	        for(int i : a){
	            query.pb(i);
	            query.pb(co);
	            co++;
	            if(co == n)break;
	        }
	        int x = use_machine(query);
            if(x&1){
                b.pb(query.back());
                x--;
            }
            else a.pb(query.back());
	        score += ((int)query.size() - x - 1)/2;

	    }
	    else {
            for(int i : b){
                query.pb(i);
                query.pb(co);
                co++;
                if(co == n)break;
            }
            int x = use_machine(query);
            if(x&1){
                a.pb(query.back());
                x--;
            }
            else b.pb(query.back());
            score += x/2;
	    }
	}
    return score + a.size();
}
/*
int main(){

    cout << count_mushrooms(test.size()) << endl;
}
*/
//NEVER GIVE UP
//LONG LONG

• Subtask 1: 92.2449 / 100