Submission #1117829

#	Time	Username	Problem	Language	Result	Execution time	Memory
1117829		AtabayRajabli	Match (CEOI16_match)	C++17	10 / 100	2 ms	4688 KiB

match

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

const int sz = 1e5 + 5;
string s, t;
int n, last[26][sz];

void f(int l, int r)
{
    if(l > r) return;
    int pos = last[s[l] - 'a'][r];
    t[l] = '(', t[pos] = ')';
    f(l + 1, pos - 1), f(pos + 1, r);
}

signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    
    cin >> s;
    n = s.size();
    stack<int> st;

    for(int i = 0; i < n; i++)
    {
        if(!st.empty() && s[st.top()] == s[i])
        {
            st.pop();
        }
        else
        {
            st.push(i);
        }
    }

    if(!st.empty())
    {
        cout << -1;
        return 0;
    }

    for(int i = 0; i < n; i++)
    {
        int l = s[i] - 'a';
        last[l][i] = i;
        if(i == 0) continue;
        for(int j = 0; j < 26; j++)
        {
            if(last[j][i - 1] >= 0 && j != l)
                last[j][i] = last[j][i - 1];
        }
    }
    
    t.resize(n);
    f(0, n - 1);

    cout << t;
}

• Subtask 1: 10 / 10
• Subtask 2: 0 / 27
• Subtask 3: 0 / 63