Submission #57205

#	Time	Username	Problem	Language	Result	Execution time	Memory
57205		RezwanArefin01	Match (CEOI16_match)	C++17	100 / 100	21 ms	10028 KiB

match

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

typedef long long ll;
typedef pair<int, int> ii; 

const int N = 1e5 + 10;
int trie[N][26], n, p[N], u, idx, ed[N];  
vector<int> v[N]; 
char s[N], ans[N]; 

int cnt = 0; 
void solve(int l, int r) {
	if(l > r) return; 
	vector<int> &x = v[ed[l + 1]];
	auto it = --lower_bound(x.begin(), x.end(), r + 1);
	ans[l] = '('; 
	ans[*it] = ')'; 
	solve(l + 1, *it - 1); 
	solve(*it + 1, r); 
}
int main(int argc, char const *argv[]) {
	scanf(" %s", s); n = strlen(s);
	stack<int> st;
	for(int i = 0; i < n; i++) {
		int c = s[i] - 'a'; 
		if(!st.size() || st.top() != c) {
			st.push(c); 
			int &v = trie[u][c];
			if(!v) v = ++idx; 
			p[v] = u; 
			u = v; 
		} else {
			st.pop(); 
			u = p[u]; 
		} ed[i + 1] = u; 
	}
	for(int i = 0; i <= n; i++) {
		v[ed[i]].push_back(i); 
	}
	if(st.size()) return 0 * puts("-1"); 
	solve(0, n - 1); 
	for(int i = 0; i < n; i++)
		putchar(ans[i]); 
}

Compilation message (stderr)

match.cpp: In function 'int main(int, const char**)':
match.cpp:23:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf(" %s", s); n = strlen(s);
  ~~~~~^~~~~~~~~~

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