Submission #946702

#	Time	Username	Problem	Language	Result	Execution time	Memory
946702		Darren0724	Match (CEOI16_match)	C++17	10 / 100	1 ms	348 KiB

match

#include <bits/stdc++.h>
using namespace std;
#define LCBorz ios_base::sync_with_stdio(false); cin.tie(0);
#define int long long
#define all(x) x.begin(), x.end()
#define endl '\n'
const int N=200005;
const int INF=1e18;
vector<int> a[26];
vector<int> v;
string ans;
void solve(int l,int r){
    if(l>=r)return;
    auto it=--lower_bound(all(a[v[l]]),r);
    if(*it<=l){
        cout<<-1<<endl;
        exit(0);
    }
    ans[l]='(';
    ans[*it]=')';
    solve(l+1,*it);
    solve(*it+1,r);
}
int32_t main() {
    LCBorz;
    string s;cin>>s;
    int n=s.size();
    v.resize(n);
    ans.assign(n,'0');
    for(int i=0;i<n;i++){
        int p=s[i]-'a';
        v[i]=p;
        a[p].push_back(i);
    }
    solve(0,n);
    cout<<ans<<endl;
    return 0;
}

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