Submission #1036912

#	Time	Username	Problem	Language	Result	Execution time	Memory
1036912		vjudge1	Homework (CEOI22_homework)	C++17	100 / 100	223 ms	177284 KiB

Main

#include <iostream>
#include <complex>
#include <iomanip>
#include <vector>
#include <algorithm>
#include <functional>
#include <bitset>
#include <queue>
#include <map>
#include <stack>
#include <cmath>
#include <cstdint>
using namespace std;

#define endl '\n'
#define db double
#define ll __int128
#define int long long
#define pb push_back
#define fs first
#define sd second
#define Mod long(1e9 + 7)
#define all(x) x.begin(), x.end()
#define unvisited long(-1)
#define Eps double(1e-9)
#define _for(i, n) for(int i = 0; i < (n); i++)
#define dbg(x) cout << #x ": " << x << endl;

const int Max = 1e6 + 7, Inf = 1e9 + 7;

void print(bool x) { cout << (x ? "YES" : "NO") << endl; }

string tostring (__int128 x)
{
    string ans = "";
    while(x > 0)
    {
        ans += (x % 10 + '0');
        x /= 10;
    }
    reverse(all(ans));
    return ans;
}

vector <vector<int>> v;
vector <int> a; int n;

pair <int, int> dfs(int node, int parent)
{
    vector <pair<int, int>> s;

    for(auto& u : v[node]) if(u != parent) {
       s.push_back(dfs(u, node));
    }

    while (s.size() < 2){
        s.push_back({ 0, 0 });
    }
    
    pair <int, int> ans = s.back();
    s.pop_back();

    for(auto& u : s){
        if(a[node] == 0){
            ans.fs = min(u.fs, ans.fs);
            ans.sd = u.sd + ans.sd;
        }
        else{
            ans.fs = u.fs + ans.fs;
            ans.sd = min(u.sd, ans.sd);
        }
    }

    if(a[node] == 0) ans.sd ++;
    else ans.fs ++;

    return ans;
}

void solve()
{
    string s; cin >> s; 

    vector <int> p; int node = 0; n = 0;

    v.push_back(vector<int> ());
    p.push_back(-1);
    a.push_back(0);

    for(int i = 0; i < (int) s.size(); i++)
    {
        n += (s[i] == '?');

        if(s[i] == 'm'){
            if(node != 0) {
                v[node].push_back(v.size());
            }

            a.push_back((s[i+1] == 'a'));
            p.push_back(node); 
            node = v.size();
            v.push_back(vector<int> ());
        }

        if(s[i] == ')'){
            node = p[node];
        }
    }

   // cerr << n << endl;

    pair <int, int> ans = dfs(1, 0);

    cout << ((n - ans.sd) - ans.fs) << endl;
}

int32_t main()
{
   ios_base::sync_with_stdio(0);
   cin.tie(0);

    int Q = 1; //cin >> Q;

    while (Q--)
    {
        solve();
    }

    return 0;
}

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