Submission #1243809

#	Time	Username	Problem	Language	Result	Execution time	Memory
1243809		yassia	Match (CEOI16_match)	C++20	37 / 100	2090 ms	776 KiB

match

#ifndef local
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#pragma GCC optimize("O3")
#endif
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
using ll = long long;
using pii = pair<int, int>;
using pll = pair<ll,ll>;
using str = string;
using ld = long double;
using hash_map =gp_hash_table<int, int>;
using hash_set= gp_hash_table <int, null_type>;
auto sd = std::chrono::high_resolution_clock::now().time_since_epoch().count();
mt19937 rnd(sd);
typedef tree<ll, null_type, less<>, rb_tree_tag,
        tree_order_statistics_node_update> ord_set;
const ll maxn = 3e5+8;
const ll inf = 2e18+7;
const ll logn = 16;
const ll mod = 1e9+7;

bool exist(str s, ll id, vector<pair<char,char>>st) {
    for (int j = id; j < (ll)s.size(); j++) {
        if (!st.empty() && s[j]==st.back().second) {
            st.pop_back();
        }
        else {
            st.push_back({'(', s[j]});
        }
    }
    return (st.empty());
}
void solve1() {
    str s;
    cin>>s;
    str seq;
    vector<pair<char,char>> st;
    ll n = s.size();
    for (int i = 0; i < n; i++){
        st.push_back({'(',s[i]});
        bool exists = exist(s, i+1, st);
        st.pop_back();
        if (!exists){
            if (st.empty()|| st.back()!=make_pair('(',s[i])){
                cout<<-1<<endl;
                return;
            }
            st.pop_back();
            seq.push_back(')');
        }
        else {
            seq.push_back('(');
            st.push_back({'(',s[i]});
        }
    }
    if (!st.empty()){
        cout<<-1<<endl;
        return;
    }
    cout<<seq;
}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
#ifdef local
    freopen("in.txt", "r", stdin);
    freopen("out.txt", "w", stdout);
#endif
    solve1();
#ifdef local
    printf_s("\n%.5f s", (double) clock() / CLOCKS_PER_SEC);
#endif
}

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