Submission #484957

#	Time	Username	Problem	Language	Result	Execution time	Memory
484957		M4mou	Counting Mushrooms (IOI20_mushrooms)	C++17	56.64 / 100	13 ms	328 KiB

mushrooms

#include <bits/stdc++.h>
#include "mushrooms.h"
#pragma GCC optimize ("Ofast")
#pragma GCC target ("avx2")

using namespace std;

using ll  = long long;
using vi  = vector<int>;

#define pb push_back
#define ff first
#define ss second
#define lb lower_bound
#define all(x) (x).begin() , (x).end()



string s;/*
int use_machine(vector<int> a){
    int c = 0;
    for(int i = 1;i<a.size();i++){
        if(s[a[i]] != s[a[i-1]])c++;
    }
    return c;
}*/
int count_mushrooms(int n) {
    int cnt = 1;
    int k = 220;
    vector<int>arrA, arrB;
    for(int i = 1;i<k && i < n;i++){
        vector<int> a;
        a = {0, i};
        if(use_machine(a)) {
            arrB.pb(i);
        }
        else {
            arrA.pb(i);
            cnt++;
        }
    }
#define sz(x) (int)x.size()
    if(sz(arrA) >= sz(arrB)) {
        int i = k;
        while(i<n){
            vector<int> a;
            for(int j : arrA){
                a.pb(j);
                a.pb(i);
                i++;
                if(i == n)break;
            }
            int x = use_machine(a);
            cnt += (int)(a.size()/2) - (x+1)/2;
        }
    }
    else {
        int i = k;
        while(i<n){
            vector<int> b;
            for(int j : arrB){
                b.pb(j);
                b.pb(i);
                i++;
                if(i == n)break;
            }
            int x = use_machine(b);
            cnt += (x+1)/2;
        }
    }
    return cnt;

}/*
int main(){
    while(1){

        cin >> s;
        cout << count_mushrooms(s.size()) << endl;
    }
}*/

• Subtask 1: 56.6416 / 100