Submission #879226

#	Time	Username	Problem	Language	Result	Execution time	Memory
879226		juliany2	Homework (CEOI22_homework)	C++17	100 / 100	56 ms	27352 KiB

Main

#include<bits/stdc++.h>
using namespace std;
using ll = long long;
#define all(x) (x).begin(), (x).end()

array<int, 3> comb(array<int, 3> a, array<int, 3> b, char tp) {
    if (tp == 'i')
        return {min(a[0], b[0]), a[1] + b[1], a[2] + b[2]};
    else
        return {a[0] + b[0] + 1, max(a[2] + b[1], b[2] + a[1]), a[2] + b[2]};
}

int main() {
    cin.tie(0)->sync_with_stdio(false);

    string s;
    cin >> s;

    stack<array<int, 3>> st;
    array<int, 3> cur = {-1, -1, -1};
    for (int i = s.size() - 1; i >= 0; i--) {
        if (s[i] == ')')
            st.push({-1, -1, -1});
        else if (s[i] == '?')
            cur = {0, 0, 1};
        else if (s[i] == ',') {
            st.top() = cur;
            cur = {-1, -1, -1};
        }
        else if (s[i] == '(') {
            cur = comb(st.top(), cur, s[i - 2]);
            st.pop();
            i -= 3;
        }
    }

    cout << cur[1] - cur[0] + 1 << '\n';

    return 0;
}

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