//#pragma GCC optimize("O3")
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/rope>
#define mem(a,v) memset((a), (v), sizeof (a))
#define enl printf("\n")
#define case(t) printf("Case #%d: ", (t))
#define ni(n) scanf("%d", &(n))
#define nl(n) scanf("%I64d", &(n))
#define nai(a, n) for (int i = 0; i < (n); i++) ni(a[i])
#define nal(a, n) for (int i = 0; i < (n); i++) nl(a[i])
#define pri(n) printf("%d\n", (n))
#define prl(n) printf("%I64d\n", (n))
#define pii pair<int, int>
#define pil pair<int, long long>
#define pll pair<long long, long long>
#define vii vector<pii>
#define vil vector<pil>
#define vll vector<pll>
#define vi vector<int>
#define vl vector<long long>
#define pb push_back
#define mp make_pair
#define fi first
#define se second
using namespace std;
using namespace __gnu_pbds;
typedef long long ll;
typedef cc_hash_table<int,int,hash<int>> ht;
typedef tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update> oset;
const double pi = acos(-1);
const int MOD = 1e9 + 7;
const int INF = 1e9 + 7;
const int MAXN = 1e5 + 5;
const double eps = 1e-9;
char str[MAXN];
int a[MAXN];//, nx[MAXN], sz[26][MAXN];
void solve(int l, int r) {
if (l > r) return;
if (str[l] == str[r]) {
a[r] = 1;
solve(l+1, r-1);
return;
}
stack<int> st;
st.push(r);
int mx = l;
for (int i = r-1; i >= l; i--) {
if (!st.empty() && str[i] == str[st.top()])
st.pop();
else
st.push(i);
if (st.empty()) {
a[i-1] = 1;
a[r] = 1;
solve(l+1, i-2);
solve(i+1, r-1);
break;
}
}
assert(st.empty());
//int u = l;
//while (nx[u] <= r && nx[u] != -1 && u != nx[u]) {
// u = nx[u];
//}
//cerr << u << " " << mx << "\n";
//int mx = u;
//a[mx] = 1;
//solve(l+1,mx-1);
//solve(mx+1,r);
}
int main() {
//mem(sz, -1);
//mem(nx, -1);
scanf("%s", str);
int n = strlen(str);
if (n & 1) return !printf("-1\n");
stack<int> st;
st.push(0);
sz[str[0]-'a'][0] = 0;
for (int i = 1; i < n; i++) {
//sz[str[i]-'a'][(int)st.size()] = i;
if (!st.empty() && str[i] == str[st.top()])
st.pop();
else
st.push(i);
//if (sz[str[i]-'a'][(int)st.size()] != -1)
// nx[sz[str[i]-'a'][(int)st.size()]] = i;
}
if (!st.empty())
return !printf("-1\n");
solve(0, n-1);
for (int i = 0; i < n; i++)
if (a[i])
printf(")");
else
printf("(");
return 0;
}
Compilation message
match.cpp: In function 'void solve(int, int)':
match.cpp:49:6: warning: unused variable 'mx' [-Wunused-variable]
int mx = l;
^~
match.cpp: In function 'int main()':
match.cpp:83:2: error: 'sz' was not declared in this scope
sz[str[0]-'a'][0] = 0;
^~
match.cpp:83:2: note: suggested alternative: 'st'
sz[str[0]-'a'][0] = 0;
^~
st
match.cpp:78:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%s", str);
~~~~~^~~~~~~~~~~
