Submission #824660

#	Time	Username	Problem	Language	Result	Execution time	Memory
824660		kwongweng	Counting Mushrooms (IOI20_mushrooms)	C++17	80.71 / 100	8 ms	476 KiB

mushrooms

#include "mushrooms.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef vector<int> vi;
typedef pair<int, int> ii;
typedef vector<ii> vii;
typedef long double ld;
typedef pair<ll, ll> pll;
#define FOR(i, a, b) for(int i = a; i < b; i++)
#define ROF(i, a, b) for(int i = a; i >= b; i--)
#define ms memset
#define pb push_back
#define fi first
#define se second
#define f use_machine

int count_mushrooms(int n) {
	int ans=0;
	vi A, B;
	A.pb(0); int a=1; int b=0;
	int cur=1;
	while (cur < n){
		if (a>b){
			vi val; int len=0;
			FOR(i,0,min(a,n-cur)){
				val.pb(A[i]); val.pb(cur+i); len+=2;
			}
			int num = f(val);
			ans += len/2-1-num/2;
			if (num%2==0) {a++; A.pb(val[len-1]);}
			else {b++; B.pb(val[len-1]);}
			cur=val[len-1]+1;
		}else{
			vi val; int len=0;
			FOR(i,0,min(b,n-cur)){
				val.pb(B[i]); val.pb(cur+i); len+=2;
			}
			int num = f(val);
			ans += num/2;
			if (num%2==0) {b++; B.pb(val[len-1]);}
			else {a++; A.pb(val[len-1]);}
			cur=val[len-1]+1;
		}
	}
	return ans+a;
}

• Subtask 1: 80.7143 / 100