Submission #476719

#	Time	Username	Problem	Language	Result	Execution time	Memory
476719		wiktoria_bazan	Match (CEOI16_match)	C++14	0 / 100	0 ms	204 KiB

match

#include <iostream>
#include <stack>
#include <algorithm>
#include <string>
#include <vector>
using namespace std;

int const N = 1e5 + 9;
int n;
string s;
stack <char> S;
int ile[N][30];
int nt[30];
vector<int> V[30];

int check(int in) {
    int a = s[in] - 'a';
    for (int i = V[a].size() - 1; i >= 0; i--) {
        int nIn = V[a][i];
        if (nIn <= in) return -1;
        bool t = true;
        for (int j = 0; j < 30; j++) {
            nt[j] = ile[nIn][j];
            if(in > 0)
                nt[j] -= ile[in - 1][j];
            if (nt[j] % 2 == 1) t = false;
        }
        if (t == true) return nIn;
    }
    return -1;
}

void task() {
    string w = "";
    for (int i = 0; i < n; i++) {
        V[s[i] - 'a'].push_back(i);
        if (i > 0) {
            for (int j = 0; j < 30; j++) 
                ile[i][j] = ile[i - 1][j];
        }
        ile[i][s[i] - 'a']++;
        w.insert(w.size(), "0");
    }
    for (int i = 0; i < n; i++) {
        if (w[i] == ')') continue;
        w[i] = '(';
        int ch = check(i);
        if (ch == -1) {
            cout << -1;
            return;
        }
        w[ch] = ')';
    }
    cout << w;
    return;
}

int main()
{
    cin >> s;
    n = s.size();
    task();
   
}

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