Submission #717699

#	Time	Username	Problem	Language	Result	Execution time	Memory
717699		stevancv	Match (CEOI16_match)	C++14	100 / 100	19 ms	11712 KiB

match

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define sp ' '
#define en '\n'
#define smin(a, b) a = min(a, b)
#define smax(a, b) a = max(a, b)
using namespace std;
const int N = 1e5 + 2;
const int inf = 1e9;
int gde[N][26];
int ans[N];
string s;
void Resi(int l, int r) {
    if (l > r) return;
    int mid = gde[r][s[l] - 'a'];
    ans[mid] = 1;
    Resi(l + 1, mid - 1);
    Resi(mid + 1, r);
}
int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    cin >> s;
    int n = s.size();
    stack<char> stk;
    for (int i = 0; i < n; i++) {
        if (!stk.empty() && stk.top() == s[i]) stk.pop();
        else stk.push(s[i]);
    }
    if (!stk.empty()) {
        cout << -1 << en;
        return 0;
    }
    for (int i = 0; i < 26 * n; i++) gde[i / 26][i % 26] = -1;
    gde[0][s[0] - 'a'] = 0;
    for (int i = 1; i < n; i++) {
        for (int j = 0; j < 26; j++) {
            if (s[i] - 'a' == j) gde[i][j] = i;
            else if (gde[i - 1][s[i] - 'a'] > 0) gde[i][j] = gde[gde[i - 1][s[i] - 'a'] - 1][j];
        }
    }
    Resi(0, n - 1);
    for (int i = 0; i < n; i++) {
        if (ans[i] == 0) cout << '(';
        else cout << ')';
    }
    cout << en;
    return 0;
}

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