Submission #466151

#	Time	Username	Problem	Language	Result	Execution time	Memory
466151		fuad27	Match (CEOI16_match)	C++17	10 / 100	1 ms	332 KiB

match

#include<bits/stdc++.h>
using namespace std;
#define MAXN 200000
string s;
int n, op[MAXN][26];
char ans[MAXN];
void solve(int l, int r) {
	if(l > r) return;
	if(op[r][s[l]-'a'] <= l) { cout<<-1<<endl; exit(0); }
	ans[l] = '(', ans[op[r][s[l]-'a']] = ')';
	solve(l+1, op[r][s[l]-'a']-1), solve(op[r][s[l]-'a']+1, r);
}
int main () {
	cin >> s;
	n=s.size();
	vector<char> st;
	for(int i = 0;i<n;i++) {
		for(int j = 0;j<26;j++) {
			if(j == s[i]-'a')op[i][j] = i;
			else if(i > 0 && op[i][s[i]-'a'] > 0)op[i][j] = op[op[i-1][s[i]-'a']-1][j];
			else op[i][j] = -1;
		}
	}
	solve(0, n-1);
	cout<<ans<<endl;
}

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