Submission #1323905

#	Time	Username	Problem	Language	Result	Execution time	Memory
1323905		gohchingjayk	Homework (CEOI22_homework)	C++20	100 / 100	103 ms	106952 KiB

Main

#pragma GCC optimize("O3,inline")
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;

using namespace std;

using ll = long long;

#define int ll

using ii = pair<int, int>;
using iii = pair<ii, int>;

constexpr int INF = 1e18 + 5;
constexpr int MAXN = 1000000 + 5;
constexpr int MOD = 1e9 + 7;

string s; 
int ctr = 0;

iii dfs() {
	if (s[ctr] == '?') return iii{ii{0, 1}, 0};
	
	bool ismax = s[ctr] == 'a';
	ctr++;
	iii ch1 = dfs();
	ctr++;
	iii ch2 = dfs();
	int sumall = ch1.first.first + ch1.first.second + ch1.second + ch2.first.first + ch2.first.second + ch2.second;
	
	iii ans;
	if (ismax) {
		ans.first.first = ch1.first.first + ch2.first.first + 1;
		ans.second = min(ch1.second, ch2.second);
		ans.first.second = sumall - ans.first.first - ans.second;
	}
	else {
		ans.first.first = min(ch1.first.first, ch2.first.first);
		ans.second = ch1.second + ch2.second + 1;
		ans.first.second = sumall - ans.second - ans.first.first;
	}
	
	return ans;
}

signed main() {
	ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);

	string t; cin >> t;
	for (char c : t) {
		if (c != 'a' && c != 'i' && c != '?') continue;
		s += c;
	}
	
	int ans = dfs().first.second;
	cout << ans;
}

• Subtask 1: 10 / 10
• Subtask 2: 13 / 13
• Subtask 3: 13 / 13
• Subtask 4: 30 / 30
• Subtask 5: 34 / 34