Submission #1350261

#	Time	Username	Problem	Language	Result	Execution time	Memory
1350261		AMel0n	Homework (CEOI22_homework)	C++20	100 / 100	264 ms	175540 KiB

Main

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const ll MAXN = 2e6 + 5;
const ll INF = 1e18;

vector<vector<ll>> adj;
vector<ll> typ;
unordered_set<ll> leaf;
pair<ll,ll> dfs(ll v) {
    if (typ[v] > 0) {
        auto [mn1, mx1] = dfs(adj[v][0]);
        auto [mn2, mx2] = dfs(adj[v][1]);
        return {mn1 + mn2, min(mx1, mx2)};
    }
    if (typ[v] < 0) {
        auto [mn1, mx1] = dfs(adj[v][0]);
        auto [mn2, mx2] = dfs(adj[v][1]);
        return {min(mn1, mn2), mx1 + mx2};
    }
    if (!typ[v]) return {1, 1};
    // min num of smaller vals required, min num of larger vals required
}
signed main() {
    cin.tie(0); ios::sync_with_stdio(false);
    string S; cin >> S;
    adj.resize(MAXN);
    typ.resize(MAXN, -INF);
    stack<ll> cur;
    ll i = 0;
    ll cnt = 0;
    while(i < S.size()) {
        if (S[i] == ',') {i++; continue;}
        if (S[i] == ')') {
            cur.pop();
            i++;
            continue;
        }
        if (cur.size()) adj[cur.top()].push_back(cnt);
        if (S[i] == 'm' && S[i+1] == 'i') {
            cur.push(cnt);
            typ[cnt++] = -1;
            i += 4;
            continue;
        }
        if (S[i] == 'm' && S[i+1] == 'a') {
            cur.push(cnt);
            typ[cnt++] = 1;
            i += 4;
            continue;
        }
        if (S[i] == '?') {
            leaf.insert(cnt);
            typ[cnt++] = 0;
            i++;
        }
    }
    auto [l, r] = dfs(0);
    cout << (leaf.size() - r + 1) - l + 1;
}

Compilation message (stderr)

Main.cpp: In function 'std::pair<long long int, long long int> dfs(ll)':
Main.cpp:23:1: warning: control reaches end of non-void function [-Wreturn-type]
   23 | }
      | ^

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