Submission #432536

#	Time	Username	Problem	Language	Result	Execution time	Memory
432536		TryMax	버섯 세기 (IOI20_mushrooms)	C++17	54.46 / 100	15 ms	308 KiB

mushrooms

#include "mushrooms.h"
#include <bits/stdc++.h>
#ifdef LOCAL
    #include "stub.cpp"
#endif // LOCAL

#define f first
#define s second
#define pb push_back

using namespace std;

const int N = 2e5 + 10, C = 150;

int a[N];

int count_mushrooms(int n){
    int ans = 1;
    for(int i = 1; i < C; ++i){
        if(i >= n)
            break;
        vector<int> x;
        x.pb(i - 1);
        x.pb(i);
        a[i] = a[i - 1] ^ use_machine(x);
        ans += (a[i] == 0);
    }
//    cout << ans << endl;
    for(int i = 1; i <= (n + C - 1) / C; ++i){
        vector<int> x;
        for(int j = 0; j < min(n, C); ++j)
            if(a[j] == 0){
                if(i * C + j >= n)
                    break;
                x.pb(j), x.pb(i * C + j);
            }
        if(!x.empty()){
            int cntb = (use_machine(x) + 1) / 2;
            ans += x.size() / 2 - cntb;
        }
        x.clear();
        for(int j = 0; j < min(n, C); ++j)
            if(a[j] == 1){
                if(i * C + j >= n)
                    break;
                x.pb(j), x.pb(i * C + j);
            }
        if(!x.empty()){
            int cnta = (use_machine(x) + 1) / 2;
            ans += cnta;
        }
    }
    return ans;
}
/*
3
0 1 1

1
2

4
0 1 0 0

3
2

*/

• Subtask 1: 54.4578 / 100