Submission #1047291

#	Time	Username	Problem	Language	Result	Execution time	Memory
1047291		nightfal	Counting Mushrooms (IOI20_mushrooms)	C++17	25 / 100	70 ms	596 KiB

mushrooms

#include <vector>
#include <iostream>
#include <tuple>
using namespace std;
int use_machine(std::vector<int> x);

std::pair<int,int> count(int n, std::vector<int> &v) {
    int numV=0, numW=0;
    for(int i=3; i+1<n; i+=2) {
        int result = use_machine({v[0],i,v[1],i+1});
        if (result%2) numW++; 
        else numV++;
        if (result/2) numW++;
        else numV++;
    }
    if (n%2==0) {
        if(use_machine({v[0],n-1})) numW++;
        else numV++;
    }
    return {numV,numW};
}
int count_mushrooms(int n) {
    vector<int> a, b; a.push_back(0);
    int numA=0, numB=0;

    for(int i=1; i<min(3,n); i++)
        if (use_machine({0,i})) b.push_back(i);
        else a.push_back(i);
    if (n<=3) return a.size();

    if (a.size()>=2) tie(numA,numB) = count(n,a);
    else tie(numB,numA) = count(n,b);
    numA += a.size(); numB += b.size();
    return numA;
}

• Subtask 1: 25 / 100