Submission #844950

#	Time	Username	Problem	Language	Result	Execution time	Memory
844950		1bin	Match (CEOI16_match)	C++14	0 / 100	1 ms	348 KiB

match

#include<bits/stdc++.h>

using namespace std;

#define all(v) v.begin(), v.end()
typedef long long ll;
const int NMAX = 1e5 + 5;
int n, a[NMAX], p[NMAX], t, chk[NMAX];
string s;
map<int, deque<int>> mp[26];

int main(void){
	ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

	cin >> s; n = s.size();
	for(int i = 0; i < n; i++) a[i] = s[i] - 'a';
	for(int i = 0; i < n; i++){
		t ^= (1 << a[i]);
		p[i] = t;
		mp[a[i]][t].emplace_back(i);
	}
	for(int i = 0; i < n; i++){
		if(chk[i]) continue;
		t = p[i] ^ (1 << a[i]);
		if(mp[a[i]][t].empty()) {
			cout << -1; return 0;
		}
		int j = mp[a[i]][t].back();
		chk[i] = 1; chk[j] = -1;
		mp[a[i]][p[i]].pop_front();
		mp[a[i]][t].pop_back();
	}
	for(int i = 0; i < n; i++) cout << (chk[i] == 1 ? '(' : ')');
	return 0;
}

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