Submission #1190006

#	Time	Username	Problem	Language	Result	Execution time	Memory
1190006		Dan4Life	Match (CEOI16_match)	C++20	10 / 100	1 ms	580 KiB

match

#include <bits/stdc++.h>
using namespace std;

#define pb push_back
#define sz(a) (int)a.size()
#define all(a) begin(a),end(a)

using ll = long long;
template<class T=int> using ar2 = array<T,2>;
template<class T=int> using ar3 = array<T,3>;

const int mxN = (int)2e5+10;
const int mxLg = 20;
const int INF = (int)1e9+1;
const ll LINF = (int)2e18+1;
 
int n;
string s,ans;
int pr[26][mxN];

void recur(int l, int r){
	if(l>r) return; int x = pr[s[l]][r];
	if(x<=l){cout<<-1<<'\n';exit(0);}
	ans[x-1] = ')'; recur(l+1,x-1); recur(x+1,r);
}

int main(){
	ios_base::sync_with_stdio(false); cin.tie(0);
	cin >> s; n=sz(s);
	for(auto &u:s)u-='a'; s='@'+s;
	for(int j = 0; j < 26; j++){
		for(int i = 1; i <= n; i++){
			if(s[i]==j) pr[j][i]=i;
			else if(pr[s[i]][i-1])pr[j][i]=pr[j][pr[s[i]][i-1]-1];
		}
	}
	ans = string(n,'(');
	recur(1,n); cout << ans << "\n";
}

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