#include <bits/stdc++.h>
/*#pragma GCC optimize("Ofast,unroll-loops")
#pragma comment(linker, "/stack:200000000")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,fma,tune=native")*/
/*#pragma GCC optimize("O2")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("avx,avx2,sse,sse2,fma")*/
using namespace std;
using ll = long long int;
using ld = long double;
using pll=pair<ll,ll>;
using pii=pair<int,int>;
#define F first
#define S second
#define pb push_back
//#define mp make_pair
#define lc v<<1
#define rc v<<1|1
#define fast_io ios::sync_with_stdio(false);cin.tie(nullptr);cout.tie(nullptr);
const int N=2e5+10,LN=19,M=14348907,SQ=350,BS=737,inf=1e9+10;
const ll INF=1e18;
const ld ep=1e-7;
const int MH=1000696969,MD=1000000007,MOD=998244353;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
#define ordered_set tree<pll, null_type,less<pll>, rb_tree_tag,tree_order_statistics_node_update>
ll pow(ll x, ll y, ll mod){
ll ans=1;
while (y != 0) {
if (y & 1) ans = ans * x % mod;
y >>= 1;
x = x * x % mod;
}
return ans;
}
string s;
ll n;
char ans[N];
vector<ll> st;
bool ck(ll l, ll r){
st={};
for(ll i=l; i<=r; i++){
if(st.empty() || s[st.back()]!=s[i]) st.pb(i);
else st.pop_back();
}
return st.empty();
}
void sol(ll l, ll r){
if(l>r) return;
ll x=s[l]-'a';
for(ll i=r; i>l; i--){
if(s[i]==s[l] && ck(l+1,i-1) && ck(i+1,r)){
ans[l]='(';
ans[i]=')';
sol(l+1,i-1);
sol(i+1,r);
return;
}
}
}
int main(){
fast_io;
cin >> s;
n=s.size();
for(ll i=0; i<n; i++){
id[s[i]-'a'].pb(i);
if(st.empty() || s[st.back()]!=s[i]) st.pb(i);
else{
st.pop_back();
}
}
if(!st.empty()){
cout << -1 << '\n';
return 0;
}
sol(0,n-1);
for(ll i=0; i<n; i++) cout << ans[i];
cout << '\n';
return 0;
}
Compilation message
match.cpp: In function 'void sol(ll, ll)':
match.cpp:52:8: warning: unused variable 'x' [-Wunused-variable]
52 | ll x=s[l]-'a';
| ^
match.cpp: In function 'int main()':
match.cpp:68:9: error: 'id' was not declared in this scope; did you mean 'i'?
68 | id[s[i]-'a'].pb(i);
| ^~
| i
